Modeling of shallow spallation of rock slope under dynamic loading

摘要

Wave propagation process and shallow spallation of rock slope under the dynamic loads is numerically simulated to investigate the applied incident compressive stress wave on the fracturing process and failure induced in the rock mass. Heterogeneity of the rock materials is taking into account and the RFPA-dynamics is firstly briefly described. Then, the propagation of compressive stress wave along a one-dimensional rock bar is performed to validate the effectiveness of the RFPA-dynamics code. Furthermore, the shallow spallation of rock slope under the dynamic loads is carried out. Numerical simulations capture the whole process of the propagation of incident compressive stress waves in the rockmass and the reflection of stress wave upon rock slope surface and the shallow spallation of rock slope induced by the reflected tensile stress wave, which is obviously different from the failure pattern of rock slope under static loads, where a circular slip failure surface normally formed in the rockmass. The approach suggested in this paper also can be used generally for estimating dynamic load influ-ences on the development of stress and displacement fields around rock slopes.