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| Influence of the orientation of the principal stress axes rotation plane on deformation of granular matter |
| XUE Long1，2，WANG Rui1，2，ZHANG Jianmin1，2 |
| (1. Institute of Geotechnical Engineering，Tsinghua University，Beijing 100084，China；2. National Engineering Laboratory for Green and Safe Construction Technology in Urban Rail Transit，Tsinghua University，Beijing 100084，China) |
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Abstract Using 3D discrete element method with force-line flexible boundary，principal stress axes rotation (PSAR) loading is achieved in arbitrary plane of cross-anisotropic granular matter. Volume strain is always contractive for various θ，the angle between the specimen?s bedding plane and the PSAR plane，and its relative magnitude varies under different intermediate principal stress coefficients. When θ = 0°， the fluctuation of the volume strain，the non-coaxial angle between the strain increment direction and the principal stress direction，and the coordination number of the specimen disappears，as the specimen is “inherently isotropic” in the PSAR plane. The direction of the normal strain in the PSAR plane changes for various θ. The relationship between the principal contact normal fabric orientation and the principal stress orientation is a likely explanation of the fluctuation of the macroscopic quantities，which is strongly influenced by θ.
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2019, Vol. 38 
