ORCID Profile
0000-0001-6380-1188
Current Organisation
University of New South Wales
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 | Structural engineering | Civil Geotechnical Engineering | Infrastructure Engineering and Asset Management | Construction Materials | Civil Engineering | Infrastructure engineering and asset management | Civil geotechnical engineering
ANZSRC Socio-Economic Objective (SEO)
Management of Greenhouse Gas Emissions from Construction Activities | Road Freight | Road Infrastructure and Networks |
Related Links
Publications
Use of a genetic algorithm to perform reliability analysis of unsaturated soil slopes
Publisher: Thomas Telford Ltd.
Date: 08-2009
DOI: 10.1680/GEOT.8.T.004
Abstract: This paper describes the development of a probabilistic design approach to analyse the stability of unsaturated soil slopes. Instability of unsaturated soil slopes is caused by the downwards progression of a wetting front, which reduces the near-surface suctions, increases the weight of soil in the failure zone and reduces the soil strength. Assuming the slip surface forms parallel to the slope surface (at a depth equal to the wetting front depth) the probability of failure is determined in this paper through the reliability index determined using a computationally efficient genetic algorithm method.
Infiltration analysis in unsaturated soil slopes
Publisher: Taylor & Francis
Date: 23-06-2008
Reinforcement strength reduction in FEM for mechanically stabilized earth structures
Publisher: Springer Science and Business Media LLC
Date: 07-2015
The effects of changing the deviatoric and spherical stresses during cyclic loading on the drained response of a sand
Publisher: Canadian Science Publishing
Date: 11-05-2023
Abstract: Changing the deviatoric and spherical stresses could affect the accumulative deformation behaviour of soils under cyclic loading. Drained cyclic triaxial loading tests were performed on saturated sand to study the dependence of cyclic loading induced axial and volumetric strain accumulations on changing the deviatoric and spherical stresses in between loading cycles. The change in the stresses was simulated by changing cell pressure and axial load along different stress paths. The variation of axial and volumetric strain accumulations before and after changing the stresses are compared and discussed. It is found that changing the stresses could have different impacts on the axial and volumetric strain accumulations, as the accumulations are affected by different mechanisms. The axial strain accumulation after changing the stresses is affected by the average stress ratio and precedent stress history. The volumetric strain accumulation is hardly affected by changing the stresses unless an increase in the average stress ratio is caused. Both axial and volumetric strain accumulations show independence on the stress path of the disturbance. For the s les with decreasing average stress ratio, the strain accumulation direction after changing the stresses cannot be fully described using Modified Cam Clay (MCC) flow rule.
Model Uncertainties in Long-Term Settlement Prediction of Landfill Waste
Publisher: Springer Singapore
Date: 11-10-2019
Effect of rainfall intensity on infiltration into partly saturated slopes
Publisher: Springer Science and Business Media LLC
Date: 31-10-2008
Physical, geotechnical and biochemical behaviours of municipal solid waste in field and laboratory bioreactors
Publisher: Elsevier BV
Date: 03-2023
Influence of Slope Height and Inclination on the Distribution of Reinforcement Loads within Reinforced Soil Slopes
Publisher: DEStech Publications
Date: 19-02-2017
Experimental Study on Reinforced Foundation Using Transparent Soil Technique
Publisher: DEStech Publications
Date: 19-02-2016
Instability of a geogrid reinforced soil wall on thick soft Shanghai clay with prefabricated vertical drains: A case study
Publisher: Elsevier BV
Date: 08-2014
Triaxial compressive behaviour of geotextile encased stone columns
Publisher: Elsevier BV
Date: 04-2019
Numerical modelling of settlement of municipal solid waste in landfills coupled with effects of biodegradation
Publisher: Elsevier BV
Date: 05-2023
Experimental investigation of water retention curves of municipal solid wastes with different paper contents, dry unit weights and degrees of biodegradation
Publisher: Elsevier BV
Date: 05-2023
Using Reliability Theory to Assess the Stability and Prolong the Design Life of Existing Engineered Slopes
Publisher: American Society of Civil Engineers
Date: 06-2017
Triaxial Shear Behavior of a Gravelly Sand with Different Forms of Reinforcement
Publisher: Hindawi Limited
Date: 18-02-2021
DOI: 10.1155/2021/8891400
Abstract: To study the effect of three-dimensional reinforcement arrangement on the behavior of a gravelly sand, triaxial tests were performed on specimens reinforced with geogrid sheet, geogrid cell, and one and two layers of geogrid sheet and geocell combination. Specimens with a diameter of 100 mm and a height of 200 mm are sheared under drained condition to monitor the variation of axial and volumetric strains with axial loading under different confining pressures. The results showed that the reinforcement schemes have different effects on soil strength improvement. The inclusion of double layers of geogrid sheet and geocell reinforcement could increase both the apparent cohesion and friction of the reinforced soil. The stress-strain relationship could be modelled with a modified hyperbolic model, which can capture the softening strain behavior of the specimens after peak strength.
Review of the historical data characterizing Latrobe Valley brown coal consolidation behaviour
Publisher: Geological Society of London
Date: 21-09-2016
DOI: 10.1144/EGSP27.19
Abstract: Victoria, Australia contains 25% of the world's known brown coal reserves. Much of the coal is located in thick seams overlain by a thin veneer of sands and clays. Three brown coal open-cut mines are presently operating in the Latrobe Valley. As a result of the mining activity, ground movements can be significant within and around the mines. Slope stability has to be managed during all mine development phases. Recent stability issues at some mines have highlighted a need to review the historical geotechnical information and data with a view to guiding future data collection. To support this purpose, the existing understanding of the geomechanical properties of the brown coal has been revisited, with emphasis on impacts of unloading. The coal has low density (specific gravity .2) and high water content ( % by volume). Given this background, historical data for 49 consolidation tests on one of the major mined upper coal seams, the Morwell seam, were extracted from the historical records. Additionally, 44 consolidation tests for interseam materials were also extracted for the same area. These data have been analysed by re-evaluation of the consolidation data. The analysis shows that the behaviour of brown coal differs from that of typical engineering soils, in that at lower load the stress v. strain gradient is higher than for greater loads. At higher loads the stress v. strain gradient is almost constant. These observations indicate that reassessment of the unloading parameters for slope design in the open cuts is required.
Laboratory study on geogrid reinforced soil wall with modular facing under cyclic strip loading
Publisher: Springer Science and Business Media LLC
Date: 23-05-2020
Effect of spatial variability in asphalt layer on critical pavement strains
Publisher: Elsevier BV
Date: 12-2023
Uncertainties in determining the responses of reinforced flexible pavements using in-situ tests
Publisher: Elsevier BV
Date: 10-2023
Optimization Technique to Determine the p-y Curves of Laterally Loaded Stiff Piles in Dense Sand
Publisher: ASTM International
Date: 19-04-2016
DOI: 10.1520/GTJ20140257
A Case Study of Two Failures of a High Cut-slope in the Northeastern Area of Sichuan, China
Publisher: Research Square Platform LLC
Date: 10-02-2022
DOI: 10.21203/RS.3.RS-1148285/V1
Abstract: A high cut-slope in the northeast of Sichuan Province, China failed after excavation followed by rainfall. A second slope failure occurred under heavy rainfall a few days after being reinforced with anchor cables and grid beams. In this study, the detailed information and the failure history of the cut-slope were first presented. A series of numerical simulations were then conducted using finite element method (FEM) to analyze the slope stability and explore the failure mechanism. The numerical analyses found that the slope failures should not be simply attributed to rainfall. Other lessons have been learned from these two failures. They are: mis-characterization of the geological and hydraulic conditions of the site, poor understanding of the reaction of strongly weathered argillaceous shale materials with weak interlayers to water, and failing to implement proper drainage system in the slope after placing shotcrete on the slope surface. These resulted in the wrong measures to protect the cut-slope and the improper remediation works to stabilize the failed slope. The bond section of the anchor cable should be installed in the moderately weathered rock layer rather than strongly weathered layer with weak planes. The multiple failures of the slope warned all the parties that proper understanding of the geological and hydrological conditions of the site and the material properties is the starting point of any design and construction works.
Experience and the perceived efficacy of cyclone preparedness behaviour
Publisher: Emerald
Date: 20-08-2020
DOI: 10.1108/IJDRBE-04-2020-0031
Abstract: Cyclone preparedness activities can significantly reduce household-related property damage and the negative knock-on effects. Research has found, however, that many people do not perform these behaviours. It is, therefore, important to understand why some people do, and others do not, perform such behaviours. This paper aims to investigate whether a commonly applied psychological theory of behaviour change can explain cyclone-specific preparedness behaviour. This study used a cross-sectional survey design to examine the relationship between demographic factors, cyclone experience, psychological factors and preparedness behaviour. Informed by the protection motivation theory (PMT), it was hypothesised that perceived efficacy, perceived cost and self-efficacy would be the strongest predictors of preparedness behaviour. Data from 356 respondents living in a cyclone-prone region were analysed using multiple regression and mediation analysis with the PROCESS macro in SPSS. In support of the hypothesis, it was found that perceived efficacy and perceived cost were the strongest psychological predictors of preparedness behaviour. Contradicting the hypothesis, however, self-efficacy was not a significant predictor of preparedness behaviour. Subsequent analysis indicated that people who have experienced cyclone damage perceive that preparedness measures are more effective for reducing damage, which, in turn, increases preparedness behaviour. This paper provides empirical support for the application of the protective motivation theory for explaining cyclone-specific preparedness behaviour. More specifically, the results indicate that people are more likely prepare for cyclones if they perceive that preparedness activities are effective for reducing damage and are relatively inexpensive and easy to perform. The findings suggest that to promote cyclone preparedness, risk communicators need to emphasise the efficacy of preparedness and downplay the costs.
Assessment of the pavement subgrade using different in-situ testing methods
Publisher: Springer International Publishing
Date: 2021
Dynamic shakedown limits for flexible pavement with cross-anisotropic materials
Publisher: Informa UK Limited
Date: 13-07-2020
Geotechnical properties of a transparent glass sand saturated with a blend of mineral oils
Publisher: Springer Science and Business Media LLC
Date: 12-2017
Measurement of pore water pressure properties of unsaturated brown coal using triaxial test
Publisher: CRC Press
Date: 05-06-2014
DOI: 10.1201/B17034-224
Geotechnical properties of fresh municipal solid wastes with different compositions under leachate exposure
Publisher: Elsevier BV
Date: 07-2022
DOI: 10.1016/J.WASMAN.2022.06.020
Abstract: This paper investigates the geotechnical properties of a type of synthetic municipal solid waste (MSW). The tests were conducted on five groups of synthetic MSW compositions, based on the field characterization of fresh MSW s les collected from Mugga Lane landfill site, ACT, Australia. Compaction, hydraulic conductivity, compression, drained and undrained shear properties of the MSWs with water and leachate addition to the field moisture content were studied. The study shows that adding leachate could increase the maximum dry density of the MSWs under given moisture contents and compaction energies. The hydraulic conductivity of the MSWs could decrease by 100-fold when the confining pressure increases from 15 kPa to 240 kPa. The shear behaviours of the MSW s les follow the strain hardening behaviours of loose sand. The cohesion of the MSWs decreases but the friction angle of the MSWs increases with leachate addition due to the change in the surface tension and viscosity of the pore liquids and the loss of cementitious components. The addition of leachate increases the compression ratios of the MSWs by around 10% to 30% due to the change in the pH of the pore liquids. The most significant components affecting the shear and compression behaviours of the MSW were paper and wood. The effects of leachate exposure on the geotechnical properties of the MSWs is not very significant. It is important to consider the variation of MSW properties to the leachate properties (viscosity, pH and surface tension) in the large body of MSWs in the landfills.
Reply to discussion by Mirmoradi on Physical and numerical modelling of strip footing on geogrid reinforced transparent sand
Publisher: Elsevier BV
Date: 02-2022
Determination of J-integral for clay during desiccation
Publisher: Thomas Telford Ltd.
Date: 12-2016
Abstract: Fracture behaviour of clay during desiccation is an important area in soil mechanics that needs further development. The current approach is to use linear elastic fracture mechanics involving parameters such as fracture toughness, measured from load tests for analysis and modelling of crack propagation. However, the importance of taking crack tip plasticity of the material into consideration has been highlighted by several researchers. This may be especially true for soft and/or slurry clay. The recently developed double ring test is the only desiccation test available today that enables determination of the elastoplastic fracture mechanic parameter J-integral. This parameter accounts for the change in potential energy with fracture propagation. Currently, there are no data for J-integral in the literature as applicable to desiccation cracking. This paper fills this gap by presenting a set of J-integral data for Churchill clay and kaolin clay measured from the double ring test. J-integral values have been calculated for both slurry and compacted clay using corresponding coefficients of linear shrinkage. The challenging task of calculating strains and stresses has been dealt with by using image analysis. In addition, the path independence for J-integral calculation and the behaviour of J-integral with the moisture content are also discussed.
Epidemics of STIs; ask why
Publisher: BMJ
Date: 20-07-2016
The Prefaces to Songsters: The Law, Aesthetics, Performers and Their Reputations
Publisher: Cambridge University Press
Date: 23-03-2017
Evaluation of the thermal efficiency and a cost analysis of different types of ground heat exchangers in energy piles
Publisher: Elsevier BV
Date: 11-2015
Applying the Protective Action Decision Model to Explain Cyclone Shutter Installation Behavior
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2021
Performance of a geogrid reinforced soil wall on PVD drained multilayer soft soils
Publisher: Elsevier BV
Date: 06-2016
Stability analyses of a reinforced soil wall on soft soils using strength reduction method
Publisher: Elsevier BV
Date: 07-2014
Coupled three-dimensional discrete element-finite difference simulation of dynamic compaction
Publisher: Springer Science and Business Media LLC
Date: 24-08-2021
The deformation behaviour of an anisotropically consolidated kaolin clay under lateral cyclic loading
Publisher: Informa UK Limited
Date: 15-11-2022
The effects of undercrossing tunnelling on the settlement of footings subjected to cyclic loading
Publisher: Elsevier BV
Date: 02-2023
A Micro-Mechanical Simulation of Sand Liquefaction Behavior by DEM
Publisher: American Society of Civil Engineers
Date: 05-05-2010
DOI: 10.1061/41101(374)31
Experimental identification of plastic shakedown behaviors of saturated clay subjected to traffic loading
Publisher: American Society of Civil Engineers
Date: 05-05-2014
Failure analyses of a reinforced embankment by Strength Reduction and Limit Equilibrium Methods considering hardening of soft clay
Publisher: Springer Science and Business Media LLC
Date: 20-06-2014
Deformation behaviour of geotechnical materials with gas bubbles and time dependent compressible organic matter
Publisher: Elsevier BV
Date: 11-2016
A Preliminary Laboratory Study of Fatigue Performance of Geogrid-Reinforced Asphalt Beam
Publisher: Springer International Publishing
Date: 2021
The effects of initial static deviatoric stress on liquefaction and pre-failure deformation characteristics of saturated sand under cyclic loading
Publisher: Elsevier BV
Date: 10-2021
Measurement of the Tensile Strength of Organic Soft Rock
Publisher: ASTM International
Date: 19-09-2014
DOI: 10.1520/GTJ20140028
Explaining hydrogen energy technology acceptance: A critical review
Publisher: Elsevier BV
Date: 03-2022
The loading effects on the mechanical behaviors of transversely isotropic rock
Publisher: CRC Press
Date: 19-12-2019
Deterministic and probabilistic multi-modal analysis of slope stability
Publisher: Elsevier BV
Date: 05-2015
Load behaviour of model strip footings on reinforced transparent soils
Publisher: Thomas Telford Ltd.
Date: 06-2019
Abstract: A number of loading tests were performed in the laboratory on strip footings resting on unreinforced and geotextile reinforced transparent soils. Fused silica sand and white oil were used to manufacture the transparent soils. Reinforcement layers with different lengths were placed at a vertical spacing of 0.25B and 0.5B, with reinforcing depths varying from 0.5B to 2B (B is the width of the strip footing), and reinforcing widths ranging from 1B to 7B. The deformation of the reinforcement layers and soil was monitored using digital cameras with the aid of a laser transmitter to highlight the deformation of the reinforcement layers. Two peaks were observed in the load-settlement curves of some footings on soils with reinforcements at 0.5B spacing. The deformation of the reinforcement layers showed that each peak point is related to the failure of one layer of reinforcement, indicating the progressive development of reinforcement failure into deeper layers. Most of the footings on soils with reinforcement layers at 0.25B spacing showed brittle failure behavior, which was due to the near-simultaneous rupture of the reinforcement layers. It was also found that longer reinforcement does not always provide greater bearing capacity at certain reinforcement spacings.
Zoning of reinforcement forces in geosynthetic reinforced cohesionless soil slopes
Publisher: Thomas Telford Ltd.
Date: 12-2017
Abstract: The zone method is widely used in the design of reinforced soil slopes, where the total reinforcement force required for slope stabilization is calculated using a design factor of safety. The reinforcement layers in different zones of the slope make different contributions to the total required reinforcing force. To determine the tension distribution in the reinforcement layers and the size of the zones, the finite element method is used in this paper to study such factors as slope angle, slope height, soil properties, and others that may affect the tension distribution in the reinforcement layers. It was found that, for reinforced cohesionless soil slopes, the nominal factor of safety of the unreinforced slope, that is, the ratio of the tangent values of soil friction angle to the slope angle, is the main factor affecting the peak tension distribution in the reinforcement layers. An updated zone method for reinforced cohesionless soil slopes is proposed based on the results from numerical modelling in the current study and historical data.
The effects of unloading on drained cyclic behaviour of Sydney sand
Publisher: Springer Science and Business Media LLC
Date: 17-04-2021
Multi-modal reliability analysis of slope stability
Publisher: Elsevier BV
Date: 2016
Rethinking Risk Perception and its Importance for Explaining Natural Hazard Preparedness Behavior
Publisher: Wiley
Date: 05-07-2022
DOI: 10.1111/RISA.13780
Abstract: Psychological theory suggests there is a positive association between risk perception and protective behavior. Empirical research has, however, found mixed support for the positive link between risk perception and protective behavior. One explanation for the inconsistent link is the way in which risk perception has been conceptualized and/or operationalized in past research. Specifically, few studies acknowledge differences in hazard severity and how it might affect risk perception and protective behavior. Past research has also tended to overlook the importance of emotional appraisal in relation to perceived hazard consequences. To address these inconsistencies in past research, 337 people living in a cyclone‐prone location were recruited to participate in an online study. In this study, respondents were randomly presented with one of five hypothetical cyclone scenarios, which differed in objective severity. Respondents were also presented with a survey, which assessed risk perception, protective action perceptions (or coping appraisal), and intentions to perform short‐term protective behaviors. As hypothesized, risk perception significantly increased preparedness intentions when controlling for hazard severity, hazard probability, and protective action perceptions. Moreover, the degree to which respondents associated negative emotions with predicted damage was also a relatively strong predictor of preparedness intentions. Overall, the findings support the theoretical link between risk perception and protective behavior and provide a new method of assessing risk perception in cross‐sectional research. On a practical level, the results suggest that increasing risk perception should promote protective behavior in response to natural hazards.
Unsaturated soil slope characterization with Karhunen–Loève and polynomial chaos via Bayesian approach
Publisher: Springer Science and Business Media LLC
Date: 23-04-2019
Uniaxial compression behavior of geotextile encased stone columns
Publisher: Elsevier BV
Date: 06-2018
A simple method to analyze infiltration into unsaturated soil slopes
Publisher: Elsevier BV
Date: 03-2008
Ultrasonic array imaging of highly attenuative materials with spatio-temporal singular value decomposition
Publisher: Elsevier BV
Date: 08-2022
DOI: 10.1016/J.ULTRAS.2022.106764
Abstract: With the increasing use of high density polyethylene (HDPE) pipes in nuclear industry which puts safety at the forefront, ultrasonic array imaging methods play a vital role in the structural integrity of HDPE pipe materials. However, the viscoelastic attenuation of HDPE pipe materials significantly decreases the level of signals, leading to a low signal-to-noise ratio caused by electronic noise. In this work, a domain-adapted spatio-temporal singular value decomposition (STSVD) processing algorithm combined with the total focusing method is proposed to improve the ultrasonic array image quality. First, the real-valued radio frequency (RF) data or A-scan signals are demodulated into the complex analytic signals containing in-phase and quadrature (I/Q) components. Then, the STSVD processing algorithm is used to filter the I/Q data, and the filtered I/Q data is converted into RF signals. Finally, the total focusing method is applied to the processed RF signals to produce the image of the region under detection as a stage of post-processing. Experiments are carried out with an ultrasonic linear phased array in contact with the HDPE pipe materials containing multiple side-drilled holes and through-wall notches. Results show that the proposed method can produce images with high quality to provide good inspection and characterization of defects in highly attenuative materials, especially the deeper defects.
Effects of biochar-amended soils as intermediate covers on the physical, mechanical and biochemical behaviour of municipal solid wastes
Publisher: Elsevier BV
Date: 11-2023
To Act or Not to Act: An Adversarial Game for Securing Vehicle Platoons
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2024
DEM modelling of screw pile penetration in loose granular assemblies considering the effect of drilling velocity ratio
Publisher: Springer Science and Business Media LLC
Date: 20-07-2019
Micro-mechanism of the interaction between sand and geogrid transverse ribs
Publisher: Thomas Telford Ltd.
Date: 12-2012
Abstract: ABSTRACT: To study the interaction between sand particles and geogrids, pullout tests were performed on one type of geogrid in Pingtan medium sand. The sand motion around the ribs was captured by high-resolution digital camera and CCD camera. The images were analysed with the aid of digital photography measurement and micro-image analysis. Microscopic particle motion and displacement fields around the transverse ribs were then obtained to verify the macro behaviour of the sand–rib interaction. It was found that the thickness of shear band increases with the normal stress applied, and the shear zone is asymmetrical to the soil–rib interface. A near wedge shape shear zone was observed by analysing the shear strain around the ribs, which indicated that a punching shear failure mechanism may be applicable to the tested geogrid in medium-dense sand. Comparison of various models for bearing capacity of geogrids shows that the size and shape of bearing members should be considered in the calculation of bearing resistance of geogrids.
The deformation characteristics of a kaolin clay under intermittent cyclic loadings
Publisher: Elsevier BV
Date: 02-2022
How fringe cyclone experience affects predictions of damage severity
Publisher: Emerald
Date: 19-05-2020
Abstract: This paper aims to understand how experience with the fringe effects of a cyclone influences perception of cyclone severity. Understanding how certain types of experience influences risk perception should help to clarify why there is an unclear link between experience and risk perception within the existing literature. A total of 155 respondents with fringe cyclone experience were recruited to fill in a closed-ended question survey. The survey was designed to assess perceptions of a previous cyclone and future cyclone severity. Most respondents who had experienced the fringe effects of a cyclone overestimated the wind speed in their location. Respondents who overestimated previous cyclone wind speed also predicted less damage from future Category 5 cyclones. This research indicates that overestimating the severity of past cyclones can have a detrimental effect on how people predict damage due to high category cyclones. The findings suggest that people with fringe cyclone experience need additional information to help reshape their perceptions of cyclone severity. This paper provides a unique perspective on the relationship between experience and risk perception by demonstrating that experience on the fringe of a cyclone has a negative influence on risk perception.
Failure mechanism of geosynthetic-encased stone columns in soft soils under embankment
Publisher: Elsevier BV
Date: 10-2015
A modified method for the prediction of Monte Carlo simulation based on the similarity of random field instances
Publisher: Springer Science and Business Media LLC
Date: 23-04-2021
DEM Modeling of Particle Breakage in Silica Sands under One-Dimensional Compression
Publisher: Springer Science and Business Media LLC
Date: 02-2016
A DEM investigation on simple shear behavior of dense granular assemblies
Publisher: Springer Science and Business Media LLC
Date: 12-2015
DEM studies on the effect of particle breakage on the critical state behaviours of granular soils under undrained shear conditions
Publisher: Springer Science and Business Media LLC
Date: 16-05-2022
DOI: 10.1007/S11440-022-01580-Y
Abstract: A number of discrete element analyses of undrained triaxial shear tests on crushable assemblies are performed using 3-dimensional particle flow code (PFC3D). The undrained shear of the s les is simulated by assigning different velocities at the boundaries to control the constant volume of the s les during the shear. Particle breakage is studied using the octahedral shear stress breakage criterion and the fragment spawning mode satisfying an Apollonian sphere packing. The microparameters of the soils are obtained by simulating the test results reported on a Nansha calcareous sand. The effects of particle breakage and drainage condition on the critical state behaviours of the sand are intensively examined. It is found that particle breakage and drainage condition do not affect the slope of the critical state p ′− q line. In the e cs −( p ′ cs / p a ) 0.7 space, the critical state line translates downward and rotates clockwise when particle breakage is considered, whilst drainage condition does not affect the critical state line. The intrinsic macro–micro correlations underlying the critical state behaviours are explored by analysing the evolution of representative micromechanical indicators such as coordination number, redundancy ratio, and fabric and force anisotropies.
Simultaneous determination of critical slip surface and reliability index for slopes
Publisher: American Society of Civil Engineers (ASCE)
Date: 07-2007
Design charts for the stability analysis of unsaturated soil slopes
Publisher: Springer Science and Business Media LLC
Date: 22-11-2010
Experimental investigation on the behavior of gravelly sand reinforced with geogrid under cyclic loading
Publisher: MDPI AG
Date: 20-12-2021
DOI: 10.3390/APP112412152
Abstract: In view of the dynamic response of geogrid-reinforced gravel under high-speed train load, this paper explores the dynamic characteristics of geogrid-reinforced gravel under semi-sine wave cyclic loading. A number of large scale cyclic triaxial tests were performed on saturated gravelly soil reinforced with geogrid to study the influence of the number of reinforcement layers and loading frequencies on the dynamic responses of reinforced gravelly sand subgrade for high speed rail track. The variation of cumulative axial and volumetric strains, excess pore pressure and resilient modulus with number of loading cycles, loading frequency, and reinforcement arrangement are analyzed. The test results reveal that the cumulative axial strain decreases as the number of reinforcement layers increases, but increases with loading frequency. The resilience modulus increases with the number of reinforcement layers, but decreases as the loading frequency increases. The addition of geogrid can reduce the excess pore water pressure of the s le, but it can slightly enhance the rubber mold embedding effect of the sand s le. As the loading frequency increases, the rubber mold embedding effect gradually weakens.
Identifying informed beliefs about hydrogen technologies across the energy supply chain
Publisher: Elsevier BV
Date: 09-2023
Load-settlement response of shallow square footings on geogrid-reinforced sand under cyclic loading
Publisher: Elsevier BV
Date: 10-2018
Failure Analysis of Reinforced Foundation Using Transparent Soils
Publisher: Springer Singapore
Date: 11-10-2019
Effect of bedding direction of oval particles on the behavior of dense granular assemblies under simple shear
Publisher: Zhejiang University Press
Date: 05-2017
The Effects of Drainage Conditions on the Cyclic Deformation Characteristics of Over Consolidated Clayey Soil
Publisher: Springer Science and Business Media LLC
Date: 09-12-2023
Physical and numerical modelling of strip footing on geogrid reinforced transparent sand
Publisher: Elsevier BV
Date: 04-2021
Measuring soil strain using fibre optic sensors
Publisher: Springer Singapore
Date: 11-10-2019
A one-dimensional elasto-viscoplastic macro-element model for creep analysis of shallow foundations on sand
Publisher: Elsevier BV
Date: 02-2022
The effects of unloading on undrained deformation of a kaolin clay under cyclic loading
Publisher: Elsevier BV
Date: 2021
Physical and numerical pull-out modelling of ribbed piles
Publisher: Thomas Telford Ltd.
Date: 02-2017
Abstract: In situ cast concrete piles with helical ribs have been used in Shanghai, China for uplift piles. The piles are about 600 mm in diameter with half-cylindrical ribs of 75 to 100 mm in radius. Pull-out tests on model helical ribbed nylon piles of different rib spacing have been carried out in a large pull-out box under different confining pressures. Pull-out resistance and displacement of the piles revealed that the resistance varies with rib spacing and is at a maximum when the ratio of rib spacing to pile diameter is 1, and the resistance is twice that of a smooth pile with the same outer diameter. Three-dimensional finite-element analysis of the model piles revealed that the inclusion of ribs changed the soil and pile interaction mechanism. Shear wedges may form ahead of the ribs. The size of the wedges varies with rib spacing, and is the largest when the ratio of rib spacing to pile diameter is about 1. The wedges may connect to each other to form larger shear zones around the piles to increase the pile resistance. It is suggested that rib spacing is one of the most important factors that affect the pull-out resistance of the piles with the designed geometry.
Experimental measurement and numerical computation of geogrid tension in centrifuge modeling
Publisher: Springer Science and Business Media LLC
Date: 11-2011
A simplified two-stage method to estimate the settlement and bending moment of upper tunnel considering the interaction of undercrossing twin tunnels
Publisher: Elsevier BV
Date: 07-2021
Liquid limit and hydraulic conductivity of brown coal composites
Publisher: Thomas Telford Ltd.
Date: 12-2016
Abstract: Adequate waste disposal is currently under high demand in Australia, due to a rapid growth in population. Australia’s scarcity and cost for the use of clays (most commonly used landfill liner material) have resulted in a search for alternative materials to achieve satisfactory performance in landfill design. This study explored liquid limit and hydraulic conductivity (HC) of coal composites for potential landfill liner use. Brown coal (lignite) was mixed with polyacrylamide (PAM) or sodium bentonite (Bt) to investigate liquid limits (LL), HC, and swelling behaviour. Each additive was subject to distilled water and sodium chloride solution (50 g/l) to investigate the effects of pore fluid chemistry. The addition of 2 wt% PAM resulted in approximately 82 percentage point (pp) increase in the LL of lignite with distilled water and 76 pp increase with 50 g/l sodium chloride (NaCl) solution. The HC of lignite also decreased by more than two orders of magnitude as the PAM content increased. The swell index of lignite composites increased with the addition of PAM. This exploratory study has found the unique property of brown coal and its composites that the LL, HC and swell index do not deteriorate significantly in the presence of highly concentrated electrolyte solution (50 g/l NaCl). Such distinct properties will be beneficial over currently used landfill liner materials.
DEM investigations of the effects of intermediate principal stress ratio and particle breakage on the critical state behaviors of granular soils
Publisher: Elsevier BV
Date: 02-2021
The impact of stress disturbance on undrained cyclic behaviour of a kaolin clay and settlement of tunnels under cyclic loading
Publisher: Springer Science and Business Media LLC
Date: 06-10-2021
New analytical solutions for shallow cohesive soils overlying trench voids under various slip surfaces
Publisher: Elsevier BV
Date: 12-2020
System reliability of slopes using multimodal optimisation
Publisher: Thomas Telford Ltd.
Date: 05-2016
Abstract: Many engineered and natural slopes have complex geometries and are multi-layered. For these slopes traditional stability analyses will tend to predict critical failure surfaces in layers with the lowest mean strength. A move toward probabilistic analyses allows a designer to account for uncertainties with respect to input parameters that allow for a more complete understanding of risk. Railway slopes, which in some cases were built more than 150 years ago, form important assets on the European rail network. Many of these structures were built at slope angles significantly higher than those allowed in modern design codes. Depending on the local geotechnical conditions these slopes may be susceptible to deep-seated failure however, a significant number of failures each year occur as shallow translational slips that develop during periods of high rainfall. Thus, for a given slope, two potential failure mechanisms might exist with very similar probabilities of failure. In this paper a novel multimodal optimisation algorithm (‘Slips’) that is capable of detecting all feasible probabilistic slip surfaces simultaneously is presented. The system reliability analysis is applied using polar co-ordinates, as this approach has been shown to be less sensitive to local numerical instabilities, which can develop due to discontinuities on the limit state surface. The approach is applied to two ex le slopes where the complexity in terms of stratification and slope geometry is varied. In addition the methodology is validated using a real-life case study involving failure of a complex slope.
Related Organisations
Related Funding Activities
Linkage Projects - Grant ID: LP220100186
Start Date: 2023
End Date: 12-2025
Amount: $450,000.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Training Centres - Grant ID: IC230100015
Start Date: 2023
End Date: 12-2027
Amount: $5,000,000.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Research Hubs - Grant ID: IH180100010
Start Date: 07-2019
End Date: 06-2025
Amount: $4,918,357.00
Funder: Australian Research Council
View Funded Activity