Abstract
In order to build a proper micro-mechanics-based constitutive model, the stress-fabric should be investigated in detail. A micromechanics-based constitutive framework is presented in this work first to predict the mechanics characteristic of anisotropic granular material. From the micromechanical aspect, the origin of deviatoric stress is decomposed into two components: contact force anisotropy and contact normal anisotropy. Based on past research, the rate of the reduced stress tensor is related with the rate of the fabric tensor. In this work, the relationship between them is verified by the DEM method. After derivation, the back stress is also related to the fabric tensor. Then the back stress is deduced from the stress-fabric-force relationship and determined with reference to the deviation of the principal directions between the reduced stress and its rate. The DEM simulation in this paper refers to Oda’s experiment to calibrate parameters. A series of three-dimensional simple shear tests simulated by DEM is first analyzed to study the stress-fabric relationship. The influence of fabric anisotropy on granular materials is specifically investigated.
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