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Anisotropic characteristics of granular materials under simple shear

Anisotropic characteristics of granular materials under simple shear

作     者:QIAN Jian-gu YOU Zi-pei HUANG Mao-song 

作者机构:Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education (Tongji University) Shanghai 200092 China Department of Geotechnical Engineering Tongji University Shanghai 200092 China 

出 版 物:《Journal of Central South University》 (中南大学学报(英文版))

年 卷 期:2013年第20卷第8期

页      面:2275-2284页

核心收录:

学科分类:08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学(可授工学、理学学位)] 

基  金:Foundation item: Projects(10972159  41272291  51238009) supported by the National Natural Science Foundation of China Project supported by the Fundamental Research Funds of the central Universities 

主  题:simple shear discrete element method anisotropy non-coaxiality 

摘      要:The discrete element method was used to investigate the microscopic characteristics of granular materials under simple shear loading conditions. A series of simple tests on photo-elastic materials were used as a benchmark. With respect to the original experimental observations, average micro-variables such as the shear stress, shear strain and the volumetric dilatancy were extracted to illustrate the performance of the DEM simulation. The change of anisotropic density distributions of contact normals and contact forces was demonstrated during the course of simple shear. On the basis of microscopic characteristics, an analytical approach was further used to explore the macroscopic behaviors involving anisotropic shear strength and anisotropic stress-dilatancy. This results show that under simple shear loading, anisotropic shear strength arises primarily due to the difference between principal directions of the stress and the fabric. In addition, non-coaxiality, referring to the difference between principal directions of the strain rate and the stress, generates less stress-dilatancy. In particular, the anisotropic hardening and anisotropic stress-dilatancy will reduce to the isotropic hardening and the classical Taylor’s stress-dilatancy under proportional loading.

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