Discrete element modeling of hollow cylinder shear behavior of granular material with fixed principal stress direction

被引：0
|
作者：
Shi D. [1 ,2 ]
Yang C. [1 ]
Xue J. [2 ,3 ]
Wang W. [1 ]
机构：
[1] College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai
[2] State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu
[3] School of Engineering and Information Technology, University of New South Wales, Canberra
来源：
| 2018年 / International Research and Training Center on Erosion and Sedimentation and China Water and Power Press卷 / 49期
关键词：
Anisotropy; Discrete element method; Hollow cylinder sample; Principal stress direction; Shear strength;
D O I：
10.13243/j.cnki.slxb.20180233
中图分类号：
学科分类号：
摘要：
This paper studies the macro and micro behavior of granular materials under torsional shear with fixed principal stress direction, using PFC3D discrete modeling on hollow cylinder tests, with emphasis on the effect of major principal stress angle on monotonic shear behavior. Stacked-wall boundaries are used to simulate the flexible membranes in hollow cylinder tests. An update controller method is developed to control the rotation velocity of particles at the top boundary, so that the shear force can be applied more effectively. The results from the simulation show that discrete element method can well simulate the stress path and stress-strain behavior of sand samples under torsional shear. The variation of the major principal stress angle α greatly affects the shear strength of the samples, and the pattern observed in the numerical modeling is similar to that in laboratory tests. The peak friction angle of the soil minimizes at the angle α=60°. The evolution of shear band is related to the variation of void ratio and coordination number in micro scale. © 2018, China Water Power Press. All right reserved.
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页码：917 / 925
页数：8
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