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Geomechanics and Engineering Volume 9, Number 6, December 2015 , pages 815-827 DOI: https://doi.org/10.12989/gae.2015.9.6.815 |
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DEM analyses of the mechanical behavior of soil and soil-rock mixture via the 3D direct shear test |
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Wen-Jie Xu, Cheng-Qing Li and Hai-Yang Zhang
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| Abstract | ||
| The mechanical behavior of soil and soil-rock mixture is investigated via the discrete element method. A non-overlapping combination method of spheres is used to model convex polyhedron rock blocks of soil-rock mixture in the DEM simulations. The meso-mechanical parameters of soil and soil-rock interface in DEM simulations are obtained from the in-situ tests. Based on the Voronoi cell, a method representing volumtric strain of the sample at the particle scale is proposed. The numerical results indicate that the particle rotation, occlusion, dilatation and self-organizing force chains are a remarkable phenomena of the localization band for the soil and soil-rock mixture samples. The localization band in a soil-rock mixture is wider than that in the soil sample. The current research shows that the 3D discrete element method can effectively simulate the mechanical behavior of soil and soil-rock mixture. | ||
| Key Words | ||
| soil-rock mixture (S-RM); discrete-element modelling (DEM); failure; shear strength; deformation; localization | ||
| Address | ||
| State Key Laboratory of Hydroscience and Hydraulic Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China 100084. | ||