ORCID Profile
0000-0001-8625-2839
Current Organisations
University of Technology Sydney
,
University of Wollongong
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Civil Geotechnical Engineering | Geotechnical Engineering | Mineralogy and Crystallography | Construction Engineering | Earthquake Engineering | Civil engineering | Functional Materials | Construction Engineering | Civil Engineering not elsewhere classified | Civil geotechnical engineering |
ANZSRC Socio-Economic Objective (SEO)
Rail Infrastructure and Networks | Civil Construction Design | Road Infrastructure and Networks | Civil Construction Processes | Civil | Environmentally Sustainable Construction not elsewhere classified | Oil and Gas Extraction | Civil | Construction Materials Performance and Processes not elsewhere classified | Road Public Transport | Stone, Ceramics and Clay Materials | Commercial Construction Design | Cement and Concrete Materials | Industrial Construction Design | Other road transport | Coal Mining and Extraction | Information Processing Services (incl. Data Entry and Capture) | Rail Equipment | Port Infrastructure and Management | Ground transport not elsewhere classified | Other
Related Links
Publications
Performance Monitoring of Rail Tracks Stabilized by Geosynthetics and Shock Mats: Case Studies at Bulli and Singleton in Australia
Publisher: American Society of Civil Engineers
Date: 25-02-2013
Analytical Solutions for a Single Vertical Drain with Vacuum and Time-Dependent Surcharge Preloading in Membrane and Membraneless Systems
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2012
Performance and Prediction of Vacuum Combined Surcharge Consolidation at Port of Brisbane
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2011
Analytical model for vacuum consolidation incorporating soil disturbance caused by mandrel-driven drains
Publisher: Canadian Science Publishing
Date: 04-2017
Abstract: When vacuum preloading is applied with vertical drains, the rate of consolidation can be increased, and the stability of an embankment is enhanced due to the inward lateral movement. The aim of this study is to develop an analytical solution for vacuum preloading that accurately captures the more realistic variations in compressibility and permeability in actual ground conditions as a result of drain installation. The soil s les were obtained from various locations after drain installation to determine the characteristics of soil surrounding the vertical drain in terms of compressibility and permeability. The main differences between the proposed and conventional models are described by considering the stress history and preloading pressure. The effect of pre-consolidation pressure and the magnitude of applied preloading are examined through the dissipation of average excess pore pressure and associated settlement. The analysis of a selected case history employing the writers’ solution indicates improved accuracy of the predictions in comparison to the field measurements.
Editorial
Publisher: Thomas Telford Ltd.
Date: 08-2018
Environmental Sustainability of Soft Soil Improvement via Vacuum and Surcharge Preloading
Publisher: American Society of Civil Engineers
Date: 24-02-2014
An Evaluation of Fouled Ballast in a Laboratory Model Track Using Ground Penetrating Radar
Publisher: ASTM International
Date: 2010
DOI: 10.1520/GTJ103045
Stabilization of track substructure with geo-inclusions—experimental evidence and DEM simulation
Publisher: Informa UK Limited
Date: 19-01-2017
Ground Improvement Case Histories
Publisher: Elsevier
Date: 2015
Characterization of Compacted Coal Wash As Structural Fill Material
Publisher: American Society of Civil Engineers
Date: 29-03-2012
Behaviour of clay-fouled ballast under drained triaxial testing
Publisher: Thomas Telford Ltd.
Date: 04-2013
Abstract: Contamination or fouling of rail ballast with external fines, including slurried and pumped subgrade material (e.g. clay and silt), is one of the primary reasons for track deterioration. Fouling causes differential settlement of the track, and also decreases the load-bearing capacity, owing to the reduction in the friction angle of the granular assembly. In certain circumstances, fouled ballast needs to be cleaned or replaced to maintain the desired track stiffness, load-bearing capacity and track alignment, all of which influence safety. This paper presents and discusses the results of a series of large-scale triaxial tests conducted on latite basalt, a rail ballast of volcanic origin, commonly used in Australia. Consolidated drained triaxial tests were conducted under three different levels of confining pressure and varying degrees of clay fouling. Stress–strain degradation characteristics are discussed in detail. This paper also describes the non-linear strength envelope and a novel empirical relationship to capture the detrimental effects of clay fouling on the performance of ballasted tracks.
Predictions and Observations of Soft Clay Foundations Stabilized with Geosynthetic Drains and Vacuum Surcharge
Publisher: Elsevier
Date: 2015
A theoretical and experimental study on the behaviour of lignosulfonate-treated sandy silt
Publisher: Elsevier BV
Date: 09-2014
Soft Clay Stabilization with Geosynthetic Vertical Drains beneath Road and Railway Embankments: A Critical Review of Analytical Solutions and Numerical Analysis
Publisher: American Society of Civil Engineers
Date: 14-10-2007
DOI: 10.1061/40917(236)7
Deformation of coal fouled ballast stabilized with geogrid under cyclic load
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2013
Nonlinear consolidation analysis of multilayered soil with coupled vertical-radial drainage using the spectral method
Publisher: Springer Science and Business Media LLC
Date: 28-10-2023
DOI: 10.1007/S11440-022-01679-2
Abstract: The nonlinear variation of soil compressibility and permeability with void ratio (i.e., e -log σ ′ and e -log k ) has been included in the consolidation theory to accurately predict the behavior of soft soil stabilized by vertical drains. However, most current nonlinear consolidation models incorporating the coupled radial-vertical flow are based on some simplified assumptions, while including some features such as the complex implementation of multilayered computations, time-dependent loading and stress distribution with depth. This study hence introduces a novel approach where the spectral method is used to analyze the nonlinear consolidation behavior of multilayered soil associated with coupled vertical-radial drainage. In addition, time- and depth-dependent stress and soil properties at each soil layer are incorporated into the proposed model. Subsequently, the solution is verified against experimental and field data with comparison to previous analytical solutions. The results show greater accuracy of the proposed method in predicting in-situ soil behavior. A parametric study based on the proposed solution indicates that the ratio between the compression and permeability indices ( ω = C c /C k ) has a great impact on the consolidation rate, i.e., the greater the ω , the smaller the consolidation rate. Increasing the load increment ratio and the absolute difference between unity and ω (i.e., | ω − 1|) can exacerbate prediction error if the conventional simplified methods are used.
Small Strain Behaviour of a Compacted Subgrade Soil
Publisher: Elsevier BV
Date: 2016
Soft soil foundation improved by vacuum and surcharge loading
Publisher: Thomas Telford Ltd.
Date: 05-2012
Abstract: The Pacific Highway has been upgraded to support the high transportation demand between Sydney and Brisbane, along the north-east coast of Australia. To avoid the traffic through the busy town of Ballina, a bypass route was designed to traverse on a floodplain consisting of very soft, highly compressible, saturated marine clays up to 30 m deep in certain locations. A vacuum-assisted surcharge load scheme in conjunction with prefabricated vertical drains was selected to reduce the required time to consolidate the deep subsoil layers. The design of the combined vacuum and surcharge fill system and the construction of the embankment are described, and a comparison of the performance between the combined vacuum and surcharge loading system with the conventional surcharge only system is highlighted. Field data are presented and interpreted to demonstrate how the embankments performed during construction in both vacuum and non-vacuum areas. Suitable design charts for vertical drains are presented and discussed with a worked ex le, considering both vertical and radial drainage.
Experimental and discrete element modeling of geocell-stabilized subballast subjected to cyclic loading
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2016
Radial consolidation modelling incorporating the effect of a smear zone for a multilayer soil with downdrag caused by mandrel action
Publisher: Canadian Science Publishing
Date: 09-2010
DOI: 10.1139/T09-149
Abstract: A system of prefabricated vertical drains with surcharge preloading is an effective method for promoting radial drainage and accelerated soil consolidation. A piecewise technique is employed to analyse the radial consolidation in a multilayer soil system to include (i) the effect of soil downdrag and (ii) a smear zone having linearly varying soil permeability. The effect of soil dragged down from the upper soil layer into the lower layer has been analysed in terms of the time required for consolidation. It can be seen that the consolidation of the multilayer soil depends on smear zone characteristics, the permeability ratio between upper and lower soil layers, penetration depth, and drain spacing. Design procedures are described with the help of an ex le.
Stone Column–Stabilized Soft-Soil Performance Influenced by Clogging and Lateral Deformation: Laboratory and Numerical Evaluation
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2018
Consolidation of Ground with Partially Penetrated PVDs Combined with Vacuum Preloading
Publisher: American Society of Civil Engineers
Date: 11-03-2011
DOI: 10.1061/41165(397)59
Corrigendum: Hydraulic conductivity of saturated granular soils determined using a constriction-based technique
Publisher: Canadian Science Publishing
Date: 06-2012
DOI: 10.1139/T2012-049
Modelling geogrid-reinforced railway ballast using the discrete element method
Publisher: Elsevier BV
Date: 09-2016
Automatic classification of ground-penetrating-radar signals for railway-ballast assessment
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2011
Laboratory and Finite-Element Investigation of Soil Disturbance Associated with the Installation of Mandrel-Driven Prefabricated Vertical Drains
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2012
Current research into ballasted rail tracks: model tests and their practical implications
Publisher: Informa UK Limited
Date: 03-07-2017
Use of the Soil Modulus for Compaction Control of Compacted Soils
Publisher: Research Publishing Services
Date: 2012
2D and 3D Numerical Modeling of Combined Surcharge and Vacuum Preloading with Vertical Drains
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2008
Ground Improvement Case Histories
Publisher: Elsevier
Date: 2015
Laboratory study of small-strain behavior of a compacted silty sand
Publisher: Canadian Science Publishing
Date: 02-2013
Abstract: Small-strain behavior is a key indicator for assessing the performance of compacted fills. Compaction conditions, i.e., initial moisture content and applied energy, govern compaction effectiveness and thus, the structure and matric suction of compacted soil. This paper presents an experimental study of the small-strain behavior of compacted silty sand prepared with different compaction conditions. Specimens with varying initial moisture contents and compaction energies were tested with bender elements to determine the small-strain shear modulus (G 0 ), while the post-compaction matric suction was measured using the filter paper method and tensiometer. The experimental data suggest a pronounced relationship between G 0 and the degree of saturation (S r ) of the as-compacted soil specimens. X-ray computed tomography (CT) scans were performed to examine structural changes of selected specimens upon compaction. The laboratory results are also examined in light of common end-product specifications, which show that it is beneficial to compact the soil slightly dry of optimum moisture content from the modulus point of view.
Drained and Undrained Shear Behavior of Compacted Coal Wash
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2016
Automatic classification of GPR signals
Publisher: IEEE
Date: 06-2010
Use of geogrids and recycled rubber in railroad infrastructure for enhanced performance
Publisher: MDPI AG
Date: 08-01-2019
DOI: 10.3390/GEOSCIENCES9010030
Abstract: Railway tracks are conventionally built on compacted ballast and structural fill layers placed above the natural (subgrade) foundation. However, during train operations, track deteriorations occur progressively due to ballast degradation. The associated track deformation is usually accompanied by a reduction in both load bearing capacity and drainage, apart from imposing frequent track maintenance. Suitable ground improvement techniques involving plastic inclusions (e.g., geogrids) and energy absorbing materials (e.g., rubber products) to enhance the stability and longevity of tracks have become increasingly popular. This paper presents the outcomes from innovative research and development measures into the use of plastic and rubber elements in rail tracks undertaken at the University of Wollongong, Australia, over the past twenty years. The results obtained from laboratory tests, mathematical modelling and numerical modelling reveal that track performance can be improved significantly by using geogrid and energy absorbing rubber products (e.g., rubber crumbs, waste tire-cell and rubber mats). Test results show that the addition of rubber materials can efficiently improve the energy absorption of the structural layer and also reduce ballast breakage. Furthermore, by incorporating the work input parameters, the energy absorbing property of the newly developed synthetic capping layer is captured by correct modelling of dilatancy. In addition, the laboratory behavior of tire cells and geogrids has been validated by numerical modelling (i.e., Finite Element Modelling-FEM, Discrete Element—DEM), and a coupled DEM-FEM modelling approach is also introduced to simulate ballast deformation.
Laboratory Evaluation of Coefficient of Radial Consolidation Based on Pore-Water-Pressure Dissipation and Settlement
Publisher: ASTM International
Date: 12-2012
DOI: 10.1520/GTJ20120032
Laboratory Investigation of the Seepage Induced Response of Granular Soils Under Static and Cyclic Loading
Publisher: ASTM International
Date: 07-2016
DOI: 10.1520/GTJ20150288
Investigation on effectiveness of a prefabricated vertical drain during cyclic loading
Publisher: IOP Publishing
Date: 06-2010
Numerical analysis of bearing reinforcement earth (BRE) wall
Publisher: Elsevier BV
Date: 06-2012
Consolidation of Estuarine Marine Clays for Coastal Reclamation Using Vacuum and Surcharge Loading
Publisher: American Society of Civil Engineers
Date: 24-02-2014
Soft ground improvement via vertical drains and vacuum assisted preloading
Publisher: Elsevier BV
Date: 02-2012
Effectiveness of partially penetrating vertical drains under a combined surcharge and vacuum preloading
Publisher: Canadian Science Publishing
Date: 06-2011
DOI: 10.1139/T11-011
Abstract: This paper considers the consolidation of a layer of clay in which partially penetrating prefabricated vertical drains (PVDs) are used in conjunction with a combined surcharge and vacuum preloading. Analytical solutions for partially penetrating PVDs are derived by considering vacuum pressure (suction), time-dependent embankment surcharge, well resistance, and smear zone. Three-dimensional seepage with a virtual vertical drain is assumed to reflect real seepage into the soil beneath the tip of a PVD. Analytical solutions were then used to examine the length of the vertical drain and vacuum pressure on soft clay to determine the consolidation time and degree of consolidation, associated settlement, and distribution of suction along the drain. The proposed solutions are then employed to analyse a case history. Finally, an appropriate PVD length in relation to clay thickness and drain spacing is recommended for various loading patterns.
PHYSICAL AND CHEMICAL GROUND IMPROVEMENT FOR SUSTAINABLE TRANSPORTATION INFRASTRUCTURE UNDER CYCLIC LOADS
Publisher: WORLD SCIENTIFIC
Date: 05-2011
Ground Improvement at the Port of Brisbane, Australia Using Vertical Drains and Vacuum Assisted Preloading
Publisher: American Society of Civil Engineers
Date: 25-02-2013
Assessment of the Postcompaction Fill Characteristics at the Penrith Lakes Development Site
Publisher: Elsevier
Date: 2015
Deformation and Degradation of Clay fouled Ballast Subjected to Monotonic Loading
Publisher: Research Publishing Services
Date: 2012
Advanced Rail Geotechnology - Ballasted Track
Publisher: CRC Press
Date: 16-03-2011
DOI: 10.1201/B10861
Analytical solution for radial consolidation considering soil structure characteristics
Publisher: Canadian Science Publishing
Date: 07-2015
Abstract: A system of surcharge load combined with vertical drains to speed up consolidation of soft soil by reducing the drainage path is one of the most efficient and economical ground improvement techniques. In the field, conventional theories including smear zone have been commonly employed to predict the radial consolidation behaviour induced by vertical drains in soft clay. One of the key parameters in conventional analysis is the use of mean coefficient of volume compressibility and soil permeability, which are often assumed to be constant. The effect of drain installation on the soil compressibility of the in situ clay structure is often ignored. Laboratory testing has shown that the soil compressibility and permeability can vary nonlinearly over a considerable range of applied surcharge pressure, and both these properties can be affected during the drain installation. This study presents a mathematical model of radial consolidation via vertical drains incorporating the variations of soil compressibility and permeability as well as highlighting the effects of drain installation on those parameters. The main differences between the proposed and conventional models are elucidated, in terms of stress history and preloading (surcharge) pressure. The effects of preconsolidation pressure and the magnitude of applied preloading are examined through the dissipation of average excess pore pressure and associated settlement. Supported by experimental observations, the proposed theory is validated with field data of a selected case study in the town of Ballina, New South Wales, Australia.
Radial consolidation of soft soil under cyclic loads
Publisher: Elsevier BV
Date: 05-2013
Reply to the discussion by Wang and Dallo on “Hydraulic conductivity of saturated granular soils determined using a constriction-based technique” 1Appears in the Canadian Geotechnical Journ
Publisher: Canadian Science Publishing
Date: 10-2012
DOI: 10.1139/T2012-082
Modeling the Performance of Stone Column–Reinforced Soft Ground under Static and Cyclic Loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2016
Modeling the Stone Column Behavior in Soft Ground with Special Emphasis on Lateral Deformation
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2017
Characterization of Smear Zone Caused by Mandrel Action
Publisher: American Society of Civil Engineers
Date: 17-03-2015
Analytical Solutions for Filtration Process Based on Constriction Size Concept
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2013
Improvement of Soft Clays Using Vacuum-Assisted Consolidation Method
Publisher: American Society of Civil Engineers
Date: 21-02-2006
Assessing the Potential of Internal Erosion and Suffusion of Granular Soils
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2011
Ground Improvement Case Histories
Publisher: Elsevier
Date: 2015
Influence of particle gradation and shape on the performance of stone columns in soft clay
Publisher: ASTM International
Date: 02-07-2018
DOI: 10.1520/GTJ20160234
Conceptual model describing smear zone caused by mandrel action
Publisher: Thomas Telford Ltd.
Date: 12-2013
Abstract: In this study the characteristics and extent of the smear zone are investigated using a large, undisturbed s le. The aim of using such a s le is to capture the realistic characteristics of the smear zone in relation to the in situ soil structure during the installation of prefabricated vertical drains (PVDs) using a mandrel. The extent of the smear zone for Bulli clay (New South Wales, Australia) is determined on the basis of normalised permeability (k h /k hu ) and the reduction in the water content upon consolidation. The permeability and compressibility of the soil are investigated to determine the extent to which the soil surrounding the PVD has become disturbed. In laboratory testing, the soil consolidation behaviour due to a PVD is studied using a large-scale consolidometer apparatus. The numerical results have shown that the writers' solutions give excellent agreement with laboratory observations.
Performance Improvement of Railway Ballast Using Shock Mats and Synthetic Grids
Publisher: American Society of Civil Engineers
Date: 29-03-2012
Reply to the discussion by T.A. Tran and T. Mitachi on Analytical and numerical solutions for a single vertical drain including the effects of vacuum preloading
Publisher: Canadian Science Publishing
Date: 12-2006
DOI: 10.1139/T06-107
Ground Improvement for Rail, Port and Road Infrastructure--From Theory to Practice
Publisher: American Society of Civil Engineers
Date: 05-05-2014
Corrigendum: Hydraulic conductivity of saturated granular soils determined using a constriction-based technique
Publisher: Canadian Science Publishing
Date: 10-2012
DOI: 10.1139/T2012-077
Analytical solutions for a single vertical drain with time-dependent vacuum combined surcharge preloading in membrane and membraneless systems
Publisher: IOP Publishing
Date: 06-2010
Analytical and numerical solutions for a single vertical drain including the effects of vacuum preloading
Publisher: Canadian Science Publishing
Date: 08-2005
DOI: 10.1139/T05-029
Abstract: A system of vertical drains combined with vacuum preloading is an effective method to accelerate soil consolidation by promoting radial flow. This study presents the analytical modeling of vertical drains incorporating vacuum preloading in both axisymmetric and plane strain conditions. The effectiveness of the applied vacuum pressure along the drain length is considered. The exact solutions applied on the basis of the unit cell theory are supported by finite element analysis using ABAQUS software. Subsequently, the details of an appropriate matching procedure by transforming permeability and vacuum pressure between axisymmetric and equivalent plane strain conditions are described through analytical and numerical schemes. The effects of the magnitude and distribution of vacuum pressure on soft clay consolidation are examined through average excess pore pressure, consolidation settlement, and time analyses. Lastly, the practical implications of this study are discussed.Key words: consolidation, finite element method, soft clay, vacuum preloading, vertical drains.
Analytical and Numerical Modeling of Soft Soil Stabilized by Prefabricated Vertical Drains Incorporating Vacuum Preloading
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2005
Closure to “Modeling the Stone Column Behavior in Soft Ground with Special Emphasis on Lateral Deformation” by Sudip Basack, Buddhima Indraratna, Cholachat Rujikiatkamjorn, and Firman Siahaan
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2018
Closure to Deformation of coal fouled ballast stabilized with geogrid under cyclic load by Buddhima Indraratna, Ngoc Trung Ngo, and Cholachat Rujikiatkamjorn
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2014
A new parameter for classification and evaluation of railway ballast fouling
Publisher: Canadian Science Publishing
Date: 02-2011
DOI: 10.1139/T10-066
Abstract: The physical condition of railway ballast should be regularly inspected and accordingly, ballast cleaning should be carried out to maintain the safe operation of a track. This paper reviews current methods commonly used for evaluating the degree of ballast fouling, and due to their limitations, a new parameter — “relative ballast fouling ratio”— is proposed. Categories of fouling based on the proposed method are derived from the particle gradation curves taken from past literature. Comparisons between these methods demonstrate that the newly proposed relative ballast fouling ratio would best represent the influence of the type and gradation of fouling material.
Foundation behaviour below an embankment on soft soils
Publisher: Thomas Telford Ltd.
Date: 10-2008
DOI: 10.1680/GENG.2008.161.5.259
Abstract: The Sunshine Motorway is one of the major traffic corridors that service the South East region of Queensland, Australia. Initial investigations for the construction of pavements in area 2, stage 2 of the motorway began in late 1990. Large areas of soft, highly compressible organic clays were found to exist over the length of the upgrade. Also, because the topography of the proposed alignment was mostly low lying, earthworks were required over a large portion of the route. Prior to any earthworks for the stage being undertaken, a trial embankment was constructed in the area to provide an understanding of the foundation behaviour and to also ensure the overall success of the project. The finite difference code FLAC was employed to investigate the performance of the full-scale trial embankment, and the underlying soft clay. Predictions of the excess pore pressure and both vertical and lateral displacements are made and compared with field observations.
Field Assessment of the Performance of a Ballasted Rail Track with and without Geosynthetics
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2010
Advances in ground improvement using waste materials for transportation infrastructure
Publisher: Thomas Telford Ltd.
Date: 02-2022
Abstract: Recycling waste materials for transport infrastructure such as coal wash (CW), steel furnace slag (SFS), fly ash (FA) and recycled tyre products is an efficient way of minimising the stockpiles of waste materials while offering significant economic and environmental benefits, as well as improving the stability and longevity of infrastructure foundations. This paper presents some of the most recent state-of-the-art studies undertaken at the University of Wollongong, Australia on the use of waste materials such as (a) CW-based granular mixtures (i.e. SFS + CW, CW + FA) for port reclamation and road base/subbase and (b) using recycled tyre products (i.e. rubber crumbs, tyre cell, under-sleeper pads and under-ballast mats) to increase track stability and reduce ballast degradation. Typical methods of applying these waste materials for different infrastructure conditions are described and the results of comprehensive laboratory and field tests are presented and discussed.
Discussion of “Assessing the Potential of Internal Erosion and Suffusion of Granular Soils” by Buddhima Indraratna, Vo Trong Nguyen, and Cholachat Rujikiatkamjorn
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2012
Analysis of Soil Disturbance Associated with Mandrel-Driven Prefabricated Vertical Drains Using an Elliptical Cavity Expansion Theory
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2010
Analysis of Radial Vacuum-Assisted Consolidation Using 3D Finite Element Method
Publisher: American Society of Civil Engineers
Date: 14-10-2007
DOI: 10.1061/40917(236)12
Study on the Interface Behavior of a Geosynthetics-Reinforced Fouled Ballast Using the Discrete Element Method
Publisher: American Society of Civil Engineers
Date: 08-08-2016
Hydraulic conductivity of saturated granular soils determined using a constriction-based technique
Publisher: Canadian Science Publishing
Date: 05-2012
DOI: 10.1139/T2012-016
Abstract: This study presents a new semi-empirical approach for predicting the saturated hydraulic conductivity of noncohesive (granular) soils through a constriction size–based technique. For the same particle-size distribution of a granular filter material, there can be many different void distributions depending on the as-compacted density. Therefore, particle-size distribution is not unique in determining the hydraulic conductivity as proposed in numerous earlier studies. In contrast, the constriction-size distribution is unique for a given as-placed density of the material, and therefore it is a better representation of hydraulic conductivity as proposed in this study. Accordingly, the hydraulic conductivity of a granular medium can be represented by an empirical power function that has been established on the basis of 60 laboratory tests.
Behaviour of Fresh and Fouled Railway Ballast Subjected to Direct Shear Testing - A Discrete Element Simulation
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2012
Pore pressure based method to quantify smear around a vertical drain
Publisher: Thomas Telford Ltd.
Date: 09-2016
Abstract: Radial consolidation testing of Ballina clay (New South Wales, Australia) was carried out using a large-scale consolidometer 650 mm in diameter. In this study, the characteristics of the smear zone were evaluated on the basis of hydraulic gradient changes derived from the measured excess pore pressure data in the radial direction. The extent of the smear zone determined using this technique is compared with past approaches, where the variations in water content and lateral permeability were adopted to evaluate smear. The approach proposed herein based on the change of hydraulic gradient coincides with the previous two methods, and the smear zone could be established at almost 2·5 times the effective mandrel diameter. A good agreement is also found between the theoretical radial consolidation predictions, after incorporating the smear zone characteristics and the measured time–settlement curve. The proposed method for the determination of smear zone extent can be carried out during consolidation with minimum disturbance to soil, provided a sufficient number of pore pressure transducers are installed. It also eliminates the need for a number of soil s les and high-quality soil s ling technique after the installation of the drain.
DEM MODELLING OF GEOCELL-STABILISED SUB-BALLAST UNDER CYCLIC LOADING
Publisher: International Journal of Geomate
Date: 03-2017
Compaction Of Coal Wash As Reclamation Fill
Publisher: Research Publishing Services
Date: 2013
Influence of biodegradable natural fibre drains on the radial consolidation of soft soil
Publisher: Elsevier BV
Date: 09-2016
From theory to practice in track geomechanics – Australian perspective for synthetic inclusions
Publisher: Elsevier BV
Date: 12-2014
Closure to Micromechanics-based investigation of fouled ballast using large-scale triaxial tests and discrete element modeling by Ngoc Trung Ngo, Buddhima Indraratna, and Cholachat Rujikiatkamjorn
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2017
Track Stabilisation with Geosynthetics and Geodrains, and Performance Verification through Field Monitoring and Numerical Modelling
Publisher: Civil-Comp, Ltd.
Date: 18-04-2012
DOI: 10.4203/IJRT.1.1.9
Review of mehods of analysis for the use of vacuum preloading and vertical drains for soft clay improvement
Publisher: Informa UK Limited
Date: 12-2010
Experimental simulation and mathematical modelling of clogging in stone column
Publisher: Canadian Science Publishing
Date: 03-2018
Abstract: In this paper, time-dependent clogging is studied considering a unit cell consisting of a single stone column interacting with the surrounding soft clay. Clogging is assessed quantitatively and the corresponding void space of the column is determined using computed tomography. It is observed that the extent of clogging is substantial in the upper part of the column, but diminishes rapidly with depth. The soil properties in the clogged zone are determined indirectly through additional tests of clay–aggregates mixtures with various clay fractions. An equal strain consolidation model based on the principle of unit cell analysis is developed to capture both the initial and time-dependent clogging. The model accounts for a reduction in permeability and an increase in compressibility of the column. This current model, as expected, offers identical results to some previous studies if clogging is ignored, while the comparison with other selected models demonstrates the influence that clogging of the stone column can have on the consolidation of the surrounding soil. Furthermore, load–settlement predictions from the proposed “equal strain” model are also compared with the consolidation response of a previously developed “free strain” model.
Design procedure for vertical drains considering a linear variation of lateral permeability within the smear zone
Publisher: Canadian Science Publishing
Date: 03-2009
DOI: 10.1139/T08-124
Abstract: A system of vertical drains with surcharge preloading is an effective method for promoting radial drainage and accelerated soil consolidation. This study presents a procedure for the design of vertical drains that significantly extends the previous technique proposed by the authors to include: (i) a linear reduction of lateral permeability in the smear zone, (ii) the effect of overlapping smear zones in a closely spaced drain network, and (iii) the gain in undrained shear strength due to consolidation. Design ex les are provided for both single stage and multi-stage embankment construction demonstrating the convenient use of the proposed solutions in practical situations.
Effects Of Fouling On The Stress—Strain—Degradation Behaviour Of Rail Ballast
Publisher: Research Publishing Services
Date: 2013
Final state of soils under vacuum preloading
Publisher: Canadian Science Publishing
Date: 06-2012
DOI: 10.1139/T2012-024
Abstract: Vacuum preloading of clay deposits is becoming an increasingly popular ground improvement technique. Although many studies have been reported in literature, the mechanism of vacuum preloading is still not properly understood. Soil under vacuum preloading is expected to undergo an inward lateral deformation, therefore the influence of lateral deformation on volumetric strain requires further analysis. This paper addresses this aspect through laboratory studies on reconstituted s les of kaolinite. The Rowe cell apparatus was modified to measure lateral deformation under various states of stress because lateral and vertical deformation of soil depends on its state of stress and associated lateral pressure. A method for predicting the volumetric and lateral strains under vacuum consolidation is proposed and then applied to two case studies in China.
Geotechnical characteristics of a Rubber Intermixed Ballast System
Publisher: Springer Science and Business Media LLC
Date: 27-08-2021
Evaluating Coefficient Of Radial Consolidation Using Modified Rowe Cell
Publisher: Research Publishing Services
Date: 2013
3D Numerical Modeling of Hexagonal Wire Mesh Reinforced Embankment on Soft Bangkok Clay
Publisher: American Society of Civil Engineers
Date: 29-03-2012
Effects of Partially Penetrating Prefabricated Vertical Drains and Loading Patterns on Vacuum Consolidation
Publisher: American Society of Civil Engineers
Date: 07-03-2008
DOI: 10.1061/40971(310)74
Analytical solutions and design curves for vacuum-assisted consolidation with both vertical and horizontal drainage
Publisher: Canadian Science Publishing
Date: 02-2007
DOI: 10.1139/T06-111
Abstract: A system of vertical drains combined with vacuum preloading is an effective method for promoting radial flow to accelerate soil consolidation. This study presents the analytical modeling of the consolidation of vertical drains incorporating vacuum preloading considering both vertical and horizontal drainage. The effects of a number of dimensionless parameters involving the drain length, soil permeability, and vacuum pressure are examined through average excess pore pressure, degree of consolidation, associated settlement, and time factor analyses. An analysis of selected case histories compliments the use of the proposed solutions. Design charts are also presented for practical use.Key words: analytical solution, consolidation, design charts, vertical drains.
Improved performance of geosynthetics enhanced ballast: Laboratory and numerical studies
Publisher: Thomas Telford Ltd.
Date: 11-2018
Abstract: Ballasted rail tracks form one of the most important worldwide transportation modes in terms of traffic tonnage, serving the needs of bulk freight and passenger movement. High impact and cyclic loads can cause a significant deformation leading to poor track geometry. In order to mitigate these problems, the concept of the inclusion of geosynthetics in rail tracks is introduced. This paper presents the current state-of-the-art knowledge of rail track geomechanics, including results obtained from laboratory testing, field investigations and numerical modelling to study the load–deformation behaviour of ballast improved by geosynthetics. The shear stress–strain and deformation behaviour of geosynthetic-reinforced ballast are investigated in the laboratory using a large-scale direct shear test device, a track process simulation apparatus and a drop-weight impact testing equipment. Computational modelling using the discrete-element method is employed to simulate geosynthetic-reinforced ballasted tracks, capturing the discrete nature of ballast aggregates when subjected to various types of loading and boundary conditions. Discrete-element modelling is also used to conduct micromechanical analysis at the interface between ballast and geogrid, providing further insight into the behaviour of ballast subjected to cyclic loadings. These results provide promising approaches to incorporate into existing track design routines catering for future high-speed trains and heavier heavy hauls.
Effect of the Level of Compaction on the Internal Erosion Potential for Granular Soils
Publisher: American Society of Civil Engineers
Date: 30-03-2017
The role of compaction energy on the small strain properties of a compacted silty sand subjected to drying–wetting cycles
Publisher: Thomas Telford Ltd.
Date: 09-2015
Abstract: The elastic properties of a soil are usually investigated to describe its engineering behaviour. The results of previous studies indicate that the effect of changes in suction on the elastic response at a small strain level of soils is significant during compaction and post-compaction periods. Limited efforts have been focused on quantifying those post-compacted responses due to the changes in suction induced by wetting and drying cycles. During their service life, most earth structures experience changes in hydraulic behaviour owing to climatic changes. These seasonal fluctuations in turn impact on the geomechanical performance of compacted soil. In this paper the aspects related to the elastic properties of compacted soils subjected to cycles of drying and wetting are described. Particular emphasis is placed on the effect of compaction energy on the hysteric behaviour (i.e. litude of the hysteresis loop) and its dependence on the initial stress state conditions and suction history. The results not only confirm the importance of the current suction in governing the shear and compression velocities and associated moduli, but they also suggest that subsequent drying–wetting cycles or suction history can further induce hysteretic changes, particularly along the wetting paths.
Shear behaviour of subgrade soil with reference to varying initial shear stress and plasticity index
Publisher: Springer Science and Business Media LLC
Date: 14-02-2022
DOI: 10.1007/S11440-022-01477-W
Abstract: The influence of stress anisotropy ( K ) (i.e. the ratio between effective horizontal and vertical stresses) on the shear behaviour of soils has received significant attention in past studies, but how its influence depends on different values of the plasticity index (PI) has not been properly quantified. In this study, the results of a series of undrained triaxial tests on anisotropically consolidated soil at different values of K are reported , and together with past experimental data, the interactive roles of K and PI on the shear behaviour of soil are rigorously interpreted. The findings indicate that the peak shear strength increases with higher brittleness, whereas the peak excess pore pressure diminishes when the value of K decreases. Moreover, increasing the value of PI up to 35 tends to increase the peak shear strength, but beyond that the influence of PI seems marginal. Based on the findings of this study, empirical equations incorporating PI and K to estimate the undrained shear strength are proposed with acceptable accuracy.
Large-Strain Vacuum-Assisted Consolidation with Non-Darcian Radial Flow Incorporating Varying Permeability and Compressibility
Publisher: American Society of Civil Engineers (ASCE)
Date: 2017
Track Geomechanics for Future Railways: Use of Artificial Inclusions
Publisher: Springer International Publishing
Date: 05-08-2021
Sustainable soil improvement via vacuum preloading
Publisher: Thomas Telford Ltd.
Date: 02-2010
DOI: 10.1680/GRIM.2010.163.1.31
Abstract: The application of prefabricated vertical drains combined with vacuum and surcharge preloading is considered to be one of the most environmentally friendly ground improvement techniques. The natural atmospheric pressure is used to generate suction via a vacuum pump. In comparison with other ground improvement methods such as deep piling and deep mixing, this method will not only save a substantial cost in road and rail embankment maintenance and construction but will also enhance the speed of construction of coastal highways and rail tracks and their capacity to carry a greater traffic load. Moreover, as drains with vacuum pressure do not involve chemicals, the soil and groundwater chemistry will not change, unlike cement and lime treatment. Vacuum preloading will also reduce the impact on the environment by minimising the greenhouse gas emissions and the need for quarrying natural sand and gravel. The performances of three full-scale test embankments constructed in Thailand, China and Australia are discussed collectively, demonstrating the advantages and environmental benefits of vacuum consolidation in relation to a standard surcharge-only system.
Model track studies on fouled ballast using ground penetrating radar and multichannel analysis of surface wave
Publisher: Elsevier BV
Date: 08-2011
Chapter 7 Predictions and observations of soft clay foundations stabilized with geosynthetic drains and vacuum surcharge
Publisher: Elsevier
Date: 2005
Use of Geosynthetics in Railways Including Geocomposites and Vertical Drains
Publisher: American Society of Civil Engineers
Date: 11-03-2011
Compaction of coal wash to optimise its utilisation as water-front reclamation fill
Publisher: Informa UK Limited
Date: 03-2013
Nonlinear Analysis for a Single Vertical Drain Including the Effects of Preloading Considering the Compressibility and Permeability of the Soil
Publisher: American Society of Civil Engineers
Date: 15-02-2010
DOI: 10.1061/41095(365)11
Numerical Solution of Stone Column–Improved Soft Soil Considering Arching, Clogging, and Smear Effects
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2013
Radial consolidation of clay using compressibility indices and varying horizontal permeability
Publisher: Canadian Science Publishing
Date: 10-2005
DOI: 10.1139/T05-052
Abstract: A system of vertical drains, with surcharge load to accelerate consolidation by shortening the drainage path, is one of the most popular methods of soft ground improvement. The conventional radial consolidation theory (including smear and well resistance) has been commonly used to predict the behaviour of vertical drains in soft clay. Its mathematical formulation is based on the small strain theory and for a given stress range, a constant volume compressibility (m v ) and a constant coefficient of horizontal permeability (k h ) are assumed. However, the value of m v varies along the consolidation curve over a wide range of applied pressure (Δp). In the same manner, k h also changes with the void ratio (e). In this paper, the writers have replaced m v with the compressibility indices (C c and C r ), which define the slopes of the e log σ′ relationship. Moreover, the variation of the horizontal permeability coefficient (k h ) with the void ratio (e) during consolidation is represented by the e log k h relationship that has a slope of C k . In contrast to the conventional analysis, the current study highlights the influence of the C c /C k (or C r /C k ) ratio and the preloading increment ratio (Δp/σ i ) on the consolidation process. The analytical predictions are compared with the experimental results when a large-scale consolidation chamber was used, and these predictions show good agreement with the measured data. Finally, an embankment case history taken from Muar Plains, Malaysia, is analysed on the basis of the current solution and compared with field measurements.Key words: compressibility, embankments, permeability, soft soils, soil consolidation, vertical drains.
Behavior of geogrid-reinforced ballast under various levels of fouling
Publisher: Elsevier BV
Date: 06-2011
Aspects Related to the Small Strain Shear Modulus Behavior of Compacted Soils Subjected to Wetting and Drying
Publisher: American Society of Civil Engineers
Date: 24-02-2014
Closure to “Assessing the Potential of Internal Erosion and Suffusion of Granular Soils” by Buddhima Indraratna, Vo Trong Nguyen, and Cholachat Rujikiatkamjorn
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2012
Numerical modelling of soft soil stabilized by vertical drains, combining surcharge and vacuum preloading for a storage yard
Publisher: Canadian Science Publishing
Date: 03-2007
DOI: 10.1139/T06-124
Abstract: This paper presents a finite element analysis of a case study of a combined vacuum and surcharge load through prefabricated vertical drains (PVD) at a storage yard at Port of Tianjin, China. The top 15 m of soil at this site was very soft to soft and needed to be improved using preloading surcharges of more than 140 kPa. To avoid any stability problems associated with a high surcharge embankment, 80 kPa vacuum pressure combined with fill surcharge was applied (40 and 58 kPa for sections I and II, respectively). A plane strain analysis was performed using equivalent permeability and transformed unit-cell geometry. The converted (equivalent) parameters were incorporated in the finite element code ABAQUS, using the modified Cam-Clay theory. The performance of a trial embankment at the site of the storage yard is predicted on the basis of a constant vacuum pressure applied on the soil surface and distributed along the length of the drain. The predictions of settlement, pore-water pressure, and lateral displacement were compared with the available field data, and an acceptable agreement was found based on this numerical approach. The combination of vacuum and surcharge load can effectively shorten the preloading period, reduce the height of the embankment, and counterbalance excessive lateral displacements.Key words: consolidation, finite element analysis, plane strain method, soil improvement, vertical drains.
Behaviour of lignosulfonate-treated soil under cyclic loading
Publisher: Thomas Telford Ltd.
Date: 05-2016
Abstract: In this paper, the effectiveness of an environmentally-friendly stabilising agent for soil, lignosulfonate (LS), is examined through a series of cyclic triaxial tests. The deformation characteristics of the contents of LS-treated sandy silt when subjected to undrained cyclic triaxial loading are investigated at different confining pressures and cyclic stress levels. Test results indicate that under a given confining pressure and cyclic deviator stress, the rate of increase in axial strain is controlled by the addition of LS, which results in a smaller value of plastic axial strain (ε a,p ). For all the untreated and LS-treated specimens, the rate of increase in ε a,p increases with the increasing cyclic stress ratio (CSR). A critical value of CSR exists for a given LS content (i.e. CSR CR ), below which the specimens could remain stable irrespective of the number of load cycles. The longevity of treated specimens is improved significantly, especially for the specimens with LS = 2% by weight. As the treated specimens are subjected to a high level of cyclic stress, the excess pore pressure shows a decreasing trend with the increasing number of cycles, but then increases again rapidly when the failure becomes imminent. Compared with the untreated soil, the resilient modulus increases significantly as a result of LS treatment, especially for LS = 2%. When the LS 2%, there is no additional advantage, implying that 2% LS treatment is an optimum for this soil.
Simulation of Fresh and Fouled Ballast Behavior using Discrete Element Method
Publisher: Research Publishing Services
Date: 2012
Class A Prediction of the Behavior of Soft Estuarine Soil Foundation Stabilized by Short Vertical Drains beneath a Rail Track
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2010
Shakedown response of recycled rubber–granular waste mixtures under cyclic loading
Publisher: Thomas Telford Ltd.
Date: 10-2023
Abstract: Understanding and quantifying the long-term deformation behaviour of granular materials under repeated loads is imperative for ensuring the longevity of railway tracks. One of the most relevant characteristics of granular materials under repeated cycles of loading and unloading is their ability to achieve a relatively stable state (shakedown) after being subjected to initial compression. The shakedown response of blended rubber–granular waste mixtures under triaxial test conditions has been investigated in past studies highlighting the influence of the rubber content, confining stress and cyclic loading litude. However, a clear methodology for estimating shakedown yield limits of these granular mixtures has not been discussed in detail. The current study highlights the influence of the peak shear strength of these mixtures under static loading on their shakedown response in cyclic loading conditions. It is observed that the variation of static shear strength with rubber contents and confining stresses is found to affect the shakedown response. A unified method of estimating the shakedown limit is proposed by analysing permanent axial strains with normalised cyclic stress ratio at different loading cycles. The proposed method is validated through two independent sets of drained cyclic triaxial test data on coal wash–rubber crumb mixtures and rail ballast.
Modelling of soft ground consolidation via combined surcharge and vacuum preloading
Publisher: Taylor & Francis
Date: 25-08-2008
Discussion of “Assessing the Potential of Internal Erosion and Suffusion of Granular Soils” by Buddhima Indraratna, Vo Trong Nguyen, and Cholachat Rujikiatkamjorn
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2012
Micromechanics-based investigation of fouled ballast using large-scale triaxial tests and discrete element modeling
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2017
Analysis of the Behaviour of Stone Column Stabilized Soft Ground Supporting Transport Infrastructure
Publisher: Elsevier BV
Date: 2016
Compaction, degradation and deformation characteristics of an energy absorbing matrix
Publisher: Elsevier BV
Date: 06-2019
Shear strength of a vegetated soil incorporating both root reinforcement and suction
Publisher: Elsevier BV
Date: 03-2019
Soft Ground Improvement—Theoretical, Experimental, Numerical and Field Studies
Publisher: Springer Singapore
Date: 2019
Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2015
Soft Soil Foundation Improved by Vacuum and Surcharge Preloading at Ballina Bypass, Australia
Publisher: Research Publishing Services
Date: 2009
Radial consolidation response upon the application and removal of vacuum and fill loading
Publisher: Canadian Science Publishing
Date: 12-2015
Abstract: This Note presents a laboratory study using a Rowe cell to compare the consolidation responses upon vacuum pressure and fill load application and removal. The influences of the duration of application and removal of fill load and vacuum pressures on radial consolidation were investigated using excess pore-water pressure, axial strain, and overconsolidation ratio. It is shown that the appropriate removal time for vacuum pressure can be determined based on excess pore pressure responses.
An Analytical Model of PVD-assisted Soft Ground Consolidation
Publisher: Elsevier BV
Date: 2016
Radial consolidation model incorporating the effects of vacuum preloading and non-Darcian flow
Publisher: Thomas Telford Ltd.
Date: 09-2013
Abstract: A modified 150 mm Rowe cell equipped with pore water pressure measurement was used to capture the flow relationship during vacuum-assisted radial consolidation. Based on the measured data, a radial consolidation model incorporating the effects of vacuum preloading is proposed, based on a non-linear relationship between the flow velocity and hydraulic gradient. The predictions of the proposed consolidation model are then compared with the predictions based on Hansbo's Darcian and non-Darcian models. The agreement between the proposed model and the measured data is shown, and the advantages of the proposed model compared with the existing models are discussed. An embankment case history taken from the reclamation project at the Port of Brisbane, Australia, was analysed, based on the current solution, and compared with the field measurements.
DEM simulation of the behaviour of geogrid stabilised ballast fouled with coal
Publisher: Elsevier BV
Date: 2014
The Role of Ballast-Fouling Characteristics on the Drainage Capacity of Rail Substructure
Publisher: ASTM International
Date: 07-2012
DOI: 10.1520/GTJ104107
Analytical Solutions for Filtration Process Based on the Constriction Size Concept
Publisher: American Society of Civil Engineers
Date: 24-02-2014
Evaluation of Smear Zone Extent Surrounding Mandrel Driven Vertical Drains Using the Cavity Expansion Theory
Publisher: American Society of Civil Engineers (ASCE)
Date: 11-2008
A study of the geogrid–subballast interface via experimental evaluation and discrete element modelling
Publisher: Springer Science and Business Media LLC
Date: 06-07-2017
Excess Pore-Water Pressure Generation and Mud Pumping in Railways Under Cyclic Loading
Publisher: Springer Singapore
Date: 2019
Soil disturbance analysis due to vertical drain installation
Publisher: Thomas Telford Ltd.
Date: 06-2015
Abstract: The installation of drains creates a disturbed region known as a smear zone where the change in the clay structure affects the horizontal permeability and compressibility. The parameters required to characterise the smear effect are the extent of the smear zone and the ratio of the horizontal coefficient of permeability in the undisturbed zone and in the smear zone. Only limited studies have been carried out on different aspects of soil disturbance due to driving vertical drains and its effects on the subsequent consolidation. In this paper the disturbed zone around a rectangular mandrel was characterised using soil s les obtained from the soft clay layer at various locations beneath an embankment built at Ballina, Australia, where vertical drains were installed. By determining the change in the coefficient of permeability, the water content and volume compressibility across the smear zone, the effects of soil disturbance on consolidation due to the installation of drains can be quantified using the available numerical model.
Stabilization of ballasted rail tracks and underlying soft formation soils with geosynthetic grids and drains
Publisher: American Society of Civil Engineers
Date: 11-05-2006
DOI: 10.1061/40864(196)20
Three-Dimensional Numerical Modeling of Soft Soil Consolidation Improved by Prefabricated Vertical Drains
Publisher: American Society of Civil Engineers
Date: 11-05-2006
DOI: 10.1061/40864(196)22
Experimental Investigation on Effectiveness of a Vertical Drain under Cyclic Loads
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2009
Simulation ballasted track behavior: Numerical treatment and field application
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2017
Model Test and Theoretical Analysis for Soft Soil Foundations Improved by Prefabricated Vertical Drains
Publisher: American Society of Civil Engineers (ASCE)
Date: 2017
Using a seismic survey to measure the shear modulus of clean and fouled ballast
Publisher: Informa UK Limited
Date: 10-06-2010
Theoretical and Numerical Perspectives on Performance of Stone-Column-Improved Soft Ground with Reference to Transport Infrastructure
Publisher: Elsevier
Date: 2015
Analytical and Numerical Modeling of Consolidation by Vertical Drain beneath a Circular Embankment
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2008
Optimisation of coal wash–slag blend as a structural fill
Publisher: Thomas Telford Ltd.
Date: 02-2015
Abstract: Coal wash (CW) and basic oxygen steel slag fines (BOS) are by-products of the coal mining and steel industries, respectively. Their effective reuse and recycling through large-scale geotechnical projects, such as port reclamation, is economically beneficial and environmentally sustainable. In this study, CW and BOS were blended in order to explore the possibility to obtain synthetic fills having geotechnical properties similar or superior to conventional fills, therefore suitable as a structural fill for the Port Kembla Outer Harbour reclamation near Wollongong City, Australia. A framework with four levels of acceptance is proposed in this paper to select granular waste as structural fill materials. This framework was used for optimising the CW-BOS blend. It was found that for the Port Kembla Outer Harbour reclamation, a CW-BOS blend with a BOS content between 30 and 45% can meet most geotechnical specifications (i.e. high shear strength and bearing capacity, low swelling and particle breakage levels, and adequate permeability) required for a suitable structural fill above the high tidal level.
Finite element simulation of mandrel penetration in a normally consolidated soil
Publisher: Taylor & Francis
Date: 25-08-2008
Vertical drain consolidation with non-Darcian flow and void-ratio-dependent compressibility and permeability
Publisher: Thomas Telford Ltd.
Date: 11-2012
Abstract: Vertical drains increase the rate of consolidation in soft soils by facilitating faster dissipation of excess pore water pressure through short, horizontal drainage paths. This paper presents an analytical solution for non-linear radial consolidation under equal-strain conditions incorporating smear but ignoring well resistance. Three aspects of non-linearity are considered: (a) non-Darcian flow, (b) a log-linear void-ratio–stress relationship and (b) a log-linear void-ratio–permeability relationship. The analytical solution to non-linear radial consolidation can explicitly capture the behaviour of both overconsolidated and normally consolidated soils. For non-linear material properties, consolidation may be faster or slower when compared with the cases with constant material properties. The difference depends on the compressibility ermeability ratios (C c /C k and C r /C k ), the preconsolidation pressure and the stress increase. If C c /C k 1 or C r /C k 1 then the coefficient of consolidation increases as excess pore pressures dissipate, and the corresponding rate of consolidation is greater.
Briefing: Effect of drain installation patterns on rate of consolidation
Publisher: Thomas Telford Ltd.
Date: 11-2015
Abstract: Prefabricated vertical drains (PVDs) are employed to accelerate consolidation by decreasing the drainage path length. In the present study, using analytical solutions, an attempt was made to evaluate and quantify the effectiveness of two non-conventional PVD installation patterns, involving a parallel drain wall compared with a circular drain ring pattern, in contrast to conventional PVD installation (square or triangular patterns). The governing equations are based on the equal strain theory including the smear effect, and they provide a relative comparison between the two newly proposed installation patterns and the conventional square PVD grid, in terms of both the consolidation time and the equivalent drain spacing. The comparisons between the new and conventional installation patterns are made based on a single drain analysis and the density of PVDs per unit area.
A Laboratory Study on the Shear Behavior of Mixtures of Coal Wash and Steel Furnace Slag as Potential Structural Fill
Publisher: ASTM International
Date: 14-05-2015
DOI: 10.1520/GTJ20140047
Consolidation of Ground with Prefabricated Vertical Drains Combined with Time-Dependent Surcharge Loading in Membrane System
Publisher: American Society of Civil Engineers
Date: 29-03-2012
Improved performance of ballasted tracks under impact loading by recycled rubber mats
Publisher: Elsevier BV
Date: 09-2019
Concepts and Methodologies for Track Improvement and Associated Physical Modelling and Field Monitoring
Publisher: Springer Singapore
Date: 2019
Improved Performance of Ballasted Rail Tracks Using Plastics and Rubber Inclusions
Publisher: Elsevier BV
Date: 2017
Discrete element modelling of lateral displacement of a granular assembly under cyclic loading
Publisher: Elsevier BV
Date: 09-2015
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP230101769
Start Date: 2023
End Date: 12-2025
Amount: $569,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP180101916
Start Date: 01-2018
End Date: 06-2021
Amount: $251,962.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110200447
Start Date: 11-2011
End Date: 12-2016
Amount: $490,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP120200531
Start Date: 07-2012
End Date: 12-2016
Amount: $355,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP140100065
Start Date: 07-2014
End Date: 12-2018
Amount: $735,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100130
Start Date: 2015
End Date: 06-2017
Amount: $320,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP100200265
Start Date: 07-2010
End Date: 12-2014
Amount: $430,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP130102217
Start Date: 03-2013
End Date: 12-2016
Amount: $342,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0883244
Start Date: 10-2008
End Date: 12-2013
Amount: $350,000.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Training Centres - Grant ID: IC170100006
Start Date: 12-2017
End Date: 12-2022
Amount: $3,937,625.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP160101254
Start Date: 08-2017
End Date: 07-2022
Amount: $675,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP130100839
Start Date: 10-2013
End Date: 03-2017
Amount: $305,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE140100010
Start Date: 2014
End Date: 12-2016
Amount: $900,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP1092483
Start Date: 2010
End Date: 12-2013
Amount: $366,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0989534
Start Date: 02-2009
End Date: 03-2014
Amount: $211,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE130100006
Start Date: 2013
End Date: 12-2013
Amount: $500,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP160100280
Start Date: 02-2017
End Date: 03-2020
Amount: $590,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE120100011
Start Date: 01-2012
End Date: 12-2012
Amount: $700,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE130100028
Start Date: 06-2013
End Date: 12-2014
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP200200915
Start Date: 09-2021
End Date: 09-2024
Amount: $713,696.00
Funder: Australian Research Council
View Funded Activity