Abstract:In order to study the deformation characteristics of fractured rocks in the process of failure under direct shear conditions, PFC2D is used to conduct direct shear tests on fractured rocks, analyze the relationship among the failure displacement, failure work, and shear strength of rocks in the tests, and analyze the internal displacement of samples in the test process from the mesoscopic perspective. The results show that the fracture makes the rock produce greater deformation during the failure process. Failure work has a positive correlation with failure displacement. The direction and size of displacement on both sides of rock with a single fracture are different. The closer the rock is to the middle of the fracture, the bigger the displacement difference on both sides of fracture is, and the more serious the extrusion is. The rock with a cross fracture is divided into several different regions, and the displacement size and direction in each region are different. There are tension and extrusion on both sides of the fracture. Under the condition of direct shear, tension failure, and extrusion failure occur in each inner region.