Dynamic Stability of Open-pit Rock Slopes with Anti-dip Layered Joints under Cyclic Blasting Vibrations

A numerical simulation study is performed to investigate the dynamic response and cumulative damage failure mechanisms of an anti-dip layered jointed rock slope in an open-pit mine subjected to cyclic blasting vibrations. First of all, a numerical model of the anti-dip layered jointed rock slope in the open-pit mine is established using the 3 DEC code, building upon prior physical model tests. The simulated dynamic response, failure modes, and slope evolution are compared with experimental results to validate the numerical model' s accuracy. Subsequently, a sensitivity analysis is conducted to examine the effects of bedding and joint surface strength parameters (i.e., cohesion and friction angle) on the slope's permanent displacement and stability. The results indicate that the displacement of monitoring points increases progressively with the number of cyclic blasting events, with a sharp surge upon slope failure. Furthermore, higher bedding and joint surface strength parameters lead to reduced displacement and an increased slope stability coefficient. However, as the number of cyclic blasting events increases, the displacement of monitoring points shows an upward trend, while the stability coefficient gradually declines. These findings offer valuable theoretical insights for the design and construction of anti-dip layered jointed rock slopes subjected to cyclic blasting.