Abstract:In order to explore the mechanical properties and crack evolution of non-coplanar fractured rocks with different numbers and inclination angles, the RMT-150 rock mechanics loading testing machine is used to uniaxially compress rock-like specimens with prefabricated fractures. The results show that: when the main fracture is horizontal , Increase the inclination angle of the secondary fissure, the peak strength of the sample first increases, then decreases and then increases; when the primary fissure is inclined, increase the inclination of the secondary fissure, the peak strength of the sample increases first and then decreases; the inclination of the secondary fissure is 30° 、 45° and 60°, the existence of the second secondary crack has a certain strengthening effect on the bearing capacity of the specimen. The peak strength of the three-crack specimen is greater than the peak strength of the double-crack specimen; the location of the horizontal crack initiation is not at the tip of the crack and The specific location is affected by the secondary fissures; the prefabricated fissures appear to interpenetrate each other. The main penetration modes are tension penetration and tension-shear mixed penetration, and the failure mode is mainly diagonal shear failure; the simulation test is carried out using PFC2D numerical analysis software, and the results indicate the numerical model The failure mode is basically the same as that of the sample under indoor loading. The simulation test better reflects the crack evolution process of the crack after the sample is compressed.