An improved DEM-based mesoscale modeling of bimrocks with high-volume fraction

Abstract

Block-in-matrix rocks (bimrocks), a typical heterogeneous and discrete geomaterial, are widely found in nature and may cause problems in the design and construction of projects. The generation of mesoscale bimrocks with a high volumetric block proportion (VBP) is still a challenge. This paper proposes a novel mesoscale method that can generate bimrocks models with high VBPs and can generate high-quality mesh using the finite element method (FEM). The Rigid Block discrete element method was then applied to simulate uniaxial compression tests based on the FEM mesh. The agreement between the numerical and experimental results demonstrates that the method is reasonable and effective. In addition, the effect of VBP, strength of the block-matrix interface, and friction coefficient of rock blocks on the uniaxial compressive strength of bimrocks was also investigated.