Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling

Abstract The presence of discontinuities can significantly weaken rock masses, whose shear load-bearing capacity is always dictated by discontinuity failures. response has been extensively studied under low loading rate conditions, while the effect impact on its strength was unclear. To address this issue, samples with quantified surface roughness were tested six normal stresses (0%, 5%, 10%, 15%, 20%, and 25% uniaxial compressive strength) different rates (varying from 100 MPa/ms to 700 MPa/ms) a novel-designed testing system. Experimental results show that proportional exhibits significant dependence. Moreover, cohesion clearly rate-dependent friction angle keeps constant during loading, which shows obviously behaviors those static conditions. Considering parameters, criterion rough established. Furthermore, statistical constitutive model proposed incorporating Weibull distribution damage. successful application theoretical experimental data models well predict describe damage loading.