Fracture Experiment and Numerical Simulation of Fractured Rock-Like Samples Influenced by Opening

In order to reveal the fracture mode and mechanical response law of fractured samples under the influence of joint factors of fissure opening and fissure inclination angle, uniaxial compression tests were carried out on rock-mass specimens with different opening degrees. The test results show that the smaller the angle of prefabricated fissure is, the greater the influence of opening degree on the peak strength of fractured samples; Under the same fissure inclination angle, the peak strength of fractured samples decreases with the increase of fissure opening degree; With the increase of prefabricated fissure opening degree, the minimum value of peak strength of fractured samples is shifted from 45 ° to 0°; the elastic modulus of fractured samples is positively correlated with fissure inclination angle, and negatively correlated with fissure opening. In order to further reveal the influence mechanism of the composite factors of fissure opening and fissure inclination angle on the evolution law of micro-cracks, a single fissure numerical analysis model with different openings and fissure inclination angle was constructed based on PFC^2D numerical simulation platform. The numerical simulation experiments were carried out under the same loading conditions. Combined with the evolution law of indirect contact force-chain of particles in the vicinity of fissure surface, the mechanical response law of fracture samples affected by the composite factors of fissure inclination angle and opening degree is quantitatively analyzed from the angle of fissure surface deflection deformation.