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Date of Publication:2022-10-10

Journal:工程力学

Volume:34

Issue:6

Page Number:146-156

ISSN No.:1000-4750

Abstract:The shear strength of rock-soil mixture materials is affected by the
   content, spatial distribution and shape of rocks. In this study, soil
   particles are simulated by spheres, and irregularly-shaped rock
   particles are constructed by overlapped spherical particles. Direct
   shear tests are simulated with the discrete element method under various
   rock contents and spatial distributions of rocks. The shear strength of
   rock-soil mixture material increases with the rock contents under low
   rock contents, presents obvious fluctuation under medium rock contents,
   and increases significantly with less fluctuation under high rock
   contents. The fluctuation of shear strength under medium and high rock
   contents is attributed to the force chain distributions affected by the
   spatial distribution of rock particles. The rock-soil mixture has high
   shear strength if stable force chains are generated. On the contrary, it
   has low shear strength if weak force chains are produced in the mixture.
   This work can be helpful in revealing inherent mechanism on micro-scale
   of the deformation and shear strength characteristics of soil-rock
   mixtures.

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