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Date of Publication:2022-10-06

Journal:应用力学学报

Issue:1

Page Number:1-7

ISSN No.:1000-4939

Abstract:The discrete element model (DEM) was applied to simulate the direct shear tests of irregular limestone rubbles by constructing clump particles, where the mass of clumped-particle has the same probability distribution with that of the real rocks, and their shapes are constructed with various particle number, overlap, orientation and size of regular particles. With these clumped particles, the interlock of rocks in the direct shear test can be modeled. The nonlinear contact force model with Mohr-Coulomb yielding criteria is adopted to model the viscous-elastic interaction among clumped particles. The quaternion method is introduced to model the motion and orientation of the clumped particles between local and global coordinates. With different normal loads, the simulated shear force and the volume dilation in the direct shear test are compared well with that of laboratory measurements. The influences of normal stresses and contact friction on the bulk friction coefficient are discussed based on the DEM results. The reliability of clumped-particles for DEM simulation is validated in modeling the mechanical behaviors of irregular particles.

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