Numerical Simulation of Wave Propagation Across Multiple Parallel Rock Joints Using DEM

Abstract

The propagation of waves across parallel joints in rock mass involves multiple reflections of waves between joints. Propagation of waves across multiple parallel joints is numerically modeled and presented in this paper using distinct element simulations. The validation of numerical model was performed by comparing wave velocities obtained in laboratory and numerical simulations. For the study on wave propagation across parallel joints, DEM numerical models with varying number of joints were generated. The wave velocities, wave amplitudes and energy flux of waves were monitored. It has been found that as the number of joints in rock mass increases, there is a transition from intermediate wavelength condition to long wavelength condition. The stress waves monitored indicated that there are considerable reflections of waves between joints and waves propagating under intermediate wavelength condition sense the presence of joints. Due to the superposition of waves between joints, the waves may get amplified also.