ORCID Profile
0000-0003-2816-3250
Current Organisation
UNSW Sydney
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Civil engineering | Civil geotechnical engineering |
Publisher: Elsevier BV
Date: 2013
Publisher: EDP Sciences
Date: 2017
Publisher: Elsevier BV
Date: 03-2023
Publisher: The University of Queensland
Date: 2020
DOI: 10.14264/54548EB
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2021
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 23-11-2019
Publisher: Springer Science and Business Media LLC
Date: 05-09-2015
Publisher: Thomas Telford Ltd.
Date: 03-2022
Abstract: This paper proposes semi-analytical methods to obtain the local permeability for granular soils based on indirect measurements of the local porosity profile in a large coaxial cell permeameter using spatial time-domain reflectometry. The porosity profile is used to obtain the local permeability using the modified Kozeny–Carman and Katz–Thompson equations, which incorporated an effective particle diameter that accounted for particle migration within the permeameter. The profiles of the local permeability obtained from the proposed methods are compared with experimentally obtained permeability distributions using pressure measurements and flow rate. The permeabilities obtained with the proposed methods are comparable with the experimentally obtained permeabilities and are within one order of magnitude deviation, which is an acceptable range for practical applications.
Publisher: EDP Sciences
Date: 2019
DOI: 10.1051/E3SCONF/20199214007
Abstract: The behaviour of gap graded soils comprising non-plastic fines (sand or silt) mixed with a coarser sand or gravel fraction has received attention from researchers interested in internal instability under seepage loading (a form of internal erosion) as well as researchers interested in load:deformation responses. Skempton and Brogan [1] postulated that resistance to seepage induced instability depends upon the proportion of the overall applied stress that is transmitted by the finer fraction. Shire et al. [2] explored Skempton and Brogan’s hypothesis using DEM simulations to look at the proportion of the applied stress transmitted by the finer fractions (α) in ideal isotropic s les. They showed that at low fines contents (FC FC*) the average stress transmitted by the finer grains is less than the applied stress (α ), while for FC FC + the fines play a key role in stress transmission (α ) for FC* FC FC + , α depends on the s le density. The current contribution describes a series of constant p’ DEM triaxial test simulations carried out to assess the evolution of stress heterogeneity with shearing. The simulation data generated indicate that a s le can transition from being fines dominated (with the fines transmitting a significant proportion of the applied stress and α ≥1) to coarse or sand- dominated (with α ) as the material dilates during shear deformation. While α reduces as the s les dilate, the relationship between the α and the s le void ratio is non-trivial. The anisotropy of the coarse-coarse contact network exceeds the overall contact force anisotropy this indicates that the deviator stress is transmitted through a strong force network passing through the coarse-coarse contacts supported by the fine-coarse contacts.
Publisher: Canadian Science Publishing
Date: 08-2022
Abstract: A purpose-built permeameter was used to explore the transient evolution of porosity during the mixing process in filtration experiments. The experiments considered upward seepage flow and explored the influence of base and filter particle sizes, along with different hydraulic conditions. The permeameter acted as a coaxial transmission line enabling electromagnetic measurements based on spatial time domain reflectometry, from which the porosity profile was obtained using an inversion technique. Quantitative characteristics of the onset and progression of the mixing process were extracted from a porosity field map. The limiting onset condition was influenced by geometric and hydraulic factors, with the critical flow rate exhibiting a strong dependence on the base particle size, while the critical hydraulic gradient exhibited a stronger dependence on filter particle size. The progression of the mixing process was characterised by both the transport of base particles into the filter layer, as well as the settlement of the filter particles into the base layer due to the reduction of the effective stress at the base–filter interface leading to partial bearing failure. The rate of development of the mixture zone was strongly dependent on the hydraulic loading condition and the base particle size, but the final height of the s le after complete mixing was independent of the hydraulic loading path.
Publisher: Elsevier BV
Date: 05-2021
Publisher: Springer Science and Business Media LLC
Date: 20-04-2017
Publisher: Elsevier BV
Date: 06-2019
Publisher: Wiley
Date: 02-06-2023
DOI: 10.1002/NAG.3583
Abstract: The early stages of particle‐scale filtration in idealised granular soils were investigated using coupled Computational Fluid Dynamics and Discrete Element Method. Filtration simulations were conducted for assemblies of finer base particles underlying coarser filter particles with upward seepage flow perpendicular to the base‐filter interface. A wide range of size ratios that covered the complete spectrum of filtration behaviours were considered, along with different r ing accelerations for seepage flow to investigate the combined influence of geometric characteristics and hydraulic loading. The influence of flow conditions and size ratios on the time‐dependent infiltration depth of transported base particles was observed to be universal with respect to a newly proposed dimensionless time parameter. The susceptibility to filtration during the early stages was quantitatively investigated with the number of infiltrating base particles and the filling degree of pores within the filter. The susceptibility during the early stages was shown to have a strong correlation with pore space geometry at the filter boundary, which was also reflected by the maximum pore filling degree of the filter. While filter susceptibility has been conventionally evaluated by the size ratio of the assembly, the consideration of the pore space geometry at the filter boundary provided an alternate approach of evaluating local filter susceptibility.
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2023
Publisher: Elsevier BV
Date: 10-2023
Publisher: Thomas Telford Ltd.
Date: 28-03-2017
Publisher: Trans Tech Publications, Ltd.
Date: 07-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.846.583
Abstract: The micro-scale geometric arrangement of pores was quantitatively characterised for monodisperse granular assemblies, particularly in relation to pore volume distribution and pore orientation characteristics. Using physical experiments and numerical simulations, the pore volume distribution was uniquely described by the analytical k -gamma distribution function [1-2]. A pore orientation tensor was defined to determine the preferred orientation of in idual pores. This was subsequently used to define a global orientation tensor that revealed an isotropic pore network for the monodisperse granular assemblies considered in this study. The global orientation tensor was analytically linked to the parameters defining the pore volume distribution.
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 05-2020
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2024
End Date: 12-2026
Amount: $458,460.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2023
End Date: 12-2023
Amount: $413,874.00
Funder: Australian Research Council
View Funded Activity