Abstract
The discontinuous joints are an essential type of natural joints. The normal force, joint persistency, and distribution exert great influences on the shear resistance of the rock joints. By simulating the uniaxial compression experiment and Brazilian test, the material parameters and the basic size standard for meshing were determined. The symmetrical discontinuous joint distribution of three types were established, the cohesive elements were inserted between the solid elements, and the numerical simulation of the shear test was conducted. The effects of joint distribution, joint continuity, and normal stress on the shear resistance of joint rock were investigated, and the law of crack evolution was analyzed. The results showed that the shear process of discontinuous joints can be divided into four stages: elastic stage, strengthening stage, plastic stage, and residual stress stage. For the scattered joint distribution, the rock bridge can provide more reinforcement for the joints, which enhances the shear resistance of the joints, the stress concentration point at the end of the joint is easy to accumulate more fracture energy, which induces the initiation of the cracks, and under the influence of unbalanced torque, the both-sided joint distribution is more likely to produce tension damage.
Highlights
In nature, when deformed to a certain degree, the rock mass is no longer continuous and intact, with cracks of different sizes initiated inside
Through a summary of the crack evolution process in the numerical simulation, we found that the small cracks first appeared in the middle part of the specimen
Through a summary of the crack evolution process in the numerical simulation, we found that Materials the small cracks first appearedParameters in the middle part of the specimen
Summary
In nature, when deformed to a certain degree, the rock mass is no longer continuous and intact, with cracks of different sizes initiated inside. With the rapid development of computer technology, the numerical simulation has been widely used in the studies on the mechanical properties and crack evolution of brittle rock mass [15,16,17]. In the dynamic simulation of large deformation, the reconstruction of element deformation and mesh requires a large amount of calculation, which, to a certain extent, is unable to reflect the dynamic fracturing and crack evolution process of the rock mass [31]. With the experiment results, which demonstrated that it can be effectively applied to the simulation of [48] studied the shear behavior of rock-like materials with cracks by using the FEM-CZM method.
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