Abstract
The soil-rock mixture is a cohesive-frictional geomaterial subjected to impacts of composition and structure seriously. When it suffers from gravity or other kinds of loadings, the loss of its bearing capacity always appears a progressive failure. In this study, the ultimate criterion of the frictional material changing from the deformation stage to the failure stage is analyzed first and then the deformation and failure characteristics of the soil-rock mixture with different compositions and structures are discussed by the discrete element method. The results indicate that the deformation and failure of the soil-rock mixture under axial pressure appear a significant phenomenon of detouring around rock blocks. The bond failure zones and the ultimate shear strain increase with the increase of rock block proportion. The distribution of the bond failure zones always has a good uniformity with the inclination of rock block inclinations. The increase of cementation degree between particles expands the distribution of the bond failure zones but minifies the ultimate shear strain.
Highlights
Soil-rock mixture (SRM) is a kind of extremely heterogeneous geological material, composed of rock blocks with high stiffness and fine-grained soil with cementation
As a kind of typical frictional geomaterial, the failure of SRM will always undergo a process from elastic deformation to plastic deformation and lose its bearing capacity under compression or shear loadings completely
The yielding criterion of the Advances in Materials Science and Engineering frictional geomaterial, such as the Mohr–Coulomb criterion, gives the condition of material deformation from the linear elastic stage to plastic stage, and it cannot determine whether the material completely loses its bearing capacity under loadings or not. e geomaterial still holds a relative high level of capacity to bear loading after plastic yielding and develops the residual deformation
Summary
Soil-rock mixture (SRM) is a kind of extremely heterogeneous geological material, composed of rock blocks with high stiffness and fine-grained soil with cementation. As a kind of typical frictional geomaterial, the failure of SRM will always undergo a process from elastic deformation to plastic deformation and lose its bearing capacity under compression or shear loadings completely. The ultimate criterion of SRM changing from the deformation stage to the failure stage is analyzed based on the ideal elastic-plastic model first and the deformation and failure of reconstructed SRM taking material composition and structural features into consideration are simulated by a series of numerical uniaxial compression tests. If the geomaterial meets the ideal elastic-plastic model, the influence of the intermediate principal stress on the behavior of the geomaterial is ignored, and the relationship between the compressive strain and shear strain of the Mohr-Coulomb failure criterion can be expressed as ε1 − ε3 − 2. Where Ai is the area of the ith rock block and A0 is the total area of a SRM sample
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