Numerical Analysis

Discrete element simulation for torsional shear test by hollow cylinder apparatus

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  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Institute of Disaster Prevention and Mitigation, Wenzhou University, Wenzhou, Zhejiang 325000, China

Received date: 2014-06-24

  Online published: 2018-06-09

Supported by

This work was supported by the China Postdoctoral Science Foundation (2015M571602) and National Natural Science Foundation of China (NSFC) (41202186, 11372228).

Abstract

This paper presents results of three-dimensional simulations of the hollow cylinder test using the discrete element method (DEM). To verify the capability of numerical model, the hollow cylinder specimens are sheared at different principal stress directions. The localization in the specimen are examined in terms of the distributions of stresses and strains. The force chain formation and collapse during the loading are visualized. Meanwhile, the formation of the shear bands in the different shearing directions is characterized by porosity and shear strain rate distributions in the samples. The results show that the shear strain rate contour is a better indicator for shear band development than the porosity contours. To explore the micro behavior of the specimen, the evolutions of coordination number and particle rotation at different locations in the sample are also monitored. It is proved that 3D DEM technique can capture the macro-micro behavior of specimen in the complex stress path, which facilitate the interpretation of the stress-strain behavior from physical lab tests.

Cite this article

LI Bo,HUANG Mao-song, . Discrete element simulation for torsional shear test by hollow cylinder apparatus[J]. Rock and Soil Mechanics, 2016 , 37(4) : 1161 -1170 . DOI: 10.16285/j.rsm.2016.04.031

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