Study on Shear Mechanical Properties and Microscopic Failure Mechanism of Dentate Joints Based on DEM and Laboratory Tests

The stability control of the surrounding rock is greatly influenced by joint’s shear mechanical characteristics and deformation failure mechanism. A numerical model dentate joints was created using a particle flow discrete element method (DEM). To study behavior damage evolution joints, simulation test under same normal stress conducted. Additionally, joints’ mechanism mode were investigated from microscopic perspective in conjunction with laboratory tests. results show that strength steadily increases as roughness it rapidly decreases after reaching its peak strength, indicating an obvious brittle failure. Varied exhibit significantly different micro-crack evolution, rougher (r = 0.30, r 0.37) exhibiting greater production crack extension into model’s interior. Rock joint specimens lower 0.17) had less concentration fewer areas contact force concentration. gradually shifts abrasion to snip rises, which largely compatible shown testing. pattern development within specimen tests are good agreement distribution on joints.