Microscopic Failure Mechanism Analysis of Rock Under Dynamic Brazilian Test Based on Acoustic Emission and Moment Tensor Simulation

The dynamic tensile failure of rock is a main mode in deep underground engineering projects. microscopic mechanism analysis this plays key role disaster warning. Moment tensor inversion very well-known method used to analyze mechanisms. However, an acoustic emission (AE) event cannot be accurately distinguished experiments at the laboratory scale, because there are hundreds AE events generated within few hundred microseconds one test. Therefore, moment rarely applied tests with scale. In paper, and simulations discrete element (DEM) introduced under Brazilian Comparing simulation results micro-crack DEM, discriminant can obtain mechanical energy level micro-cracks. Furthermore, R, which ratio isotropic deviatoric components tensor, source mechanism. implosion, shear, better explain evolution process axial crack shear zones disc specimen simulation. These findings contribute understanding test than statistical types micro-cracks based on break bonds DEM.