首页|A refined deviatoric hardening plastic model for sand

A refined deviatoric hardening plastic model for sand

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The classical deviatoric hardening models are capable of characterizing the mechanical response of granular materials for a broad range of degrees of compaction.This work finds that it has limitations in accurately predicting the volumetric deformation characteristics under a wide range of confining/consolidation pressures.The issue stems from the pressure independent hardening law in the classical deviatoric hardening model.To overcome this problem,we propose a refined deviatoric hardening model in which a pressure-dependent hardening law is developed based on experimental observations.Com-parisons between numerical results and laboratory triaxial tests indicate that the improved model succeeds in capturing the volumetric deformation behavior under various confining/consolidation pressure conditions for both dense and loose sands.Furthermore,to examine the importance of the improved deviatoric hardening model,it is combined with the bounding surface plasticity theory to investigate the mechanical response of loose sand under complex cyclic loadings and different initial consolidation pressures.It is proved that the proposed pressure-dependent deviatoric hardening law is capable of predicting the volumetric deformation characteristics to a satisfactory degree and plays an important role in the simulation of complex deformations for granular geomaterials.

Elasto-plastic deformationIsotropic hardeningDeviatoric plastic strainGranular materialKinematic hardeningBounding surface

Min Wang、Tongming Qu、Yuntian Feng、Teng Liang、Liangtong Zhan

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MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou,310058,China

Department of Civil and Environmental Engineering,Hong Kong University of Science and Technology,Kowloon,999077,Hong Kong,China

Zienkiewicz Centre for Computational Engineering,College of Engineering,Swansea University,Swansea,Wales,SA1 8EP,UK

Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou,310058,China

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Basic Science Center Program for Multiphase Media Evolution in Hypergravity of the National Natural Science Foundation of China

51988101

2024

10.1016/j.jrmge.2023.09.029

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(7)