首页|Simulation of the deformable lateral boundaries in biaxial test using DEM

Simulation of the deformable lateral boundaries in biaxial test using DEM

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Applying the discrete element method(DEM)in soil mechanics can provide abundant information at the particle-scale and facilitates illustration of the macro-mechanical behaviour of soils based on the inter-particle mechanisms.The triaxial test is one of the most common laboratory methods to study the macro-mechanical behaviour of particulate materials such as soil.However,many problems in geotechnical design can be assumed and simplified as a plane strain phenomenon.Therefore a biaxial test can be conducted to reproduce the macro-mechanical behaviour of soil,where the sample is enclosed by two horizontal rigid platens and a vertical latex membrane,which is a deformable continuous element and allows the enclosed specimen to deform freely while maintaining confining stress during loading.This paper presents an algorithm to represent physical and mechanical charac-teristics of latex membrane in the 2D DEM simulation of biaxial test using the PFC2D code.To investigate the impact of the lateral boundary conditions on the micro-macro mechanical behaviours of soil samples,two sets of DEM biaxial tests are conducted,i.e.with rigid and deformable lateral boundary conditions.The DEM modeling results indicate that the lateral boundary conditions have a significant effect on the micro-scale fabric properties,thickness and inclination of the shear band.The comparison between these two simulations also demonstrates that the lateral boundary conditions play a major role in the peak and post-peak stress-strain behaviours as well as the dilation and critical state behaviours of granular soils.

Discrete element methodBiaxial testDeformable boundariesShear bandCritical stateFabric anisotropyGeometrical stability index

Ali Momeni、Barry Clarke、Yong Sheng、Ali Hassanpour

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WSP,3 Wellington Place,Leeds,LS1 4AP,UK

Hull University,Hull,HU6 7RX,UK

School of Civil Engineering,University of Leeds,Leeds,LS2 9JT,UK

School of Computer Science,University of Hull,Hull,HU6 7RX,UK

School of Chemical and Process Engineering,University of Leeds,Leeds,LS2 9JT,UK

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2024

10.1016/j.partic.2023.08.015

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.88(5)
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