Numerical simulation on rock failure process under combined static and dynamic loading

In this study, a damage-based model for simulating the damage and failure process of rock under combined static and dynamic loading is introduced, and it is implemented into RFPA-Dynamics (Rock Failure Process Analysis for Dynamics) and COMSOL Multiphysics, in order to simulate rock failure under combined static and dynamic loading conditions. The rock failure under combined static and dynamic loading during the SHPB test is numerically simulated and the mechanism associated with the dynamic strength increase under combined static and dynamic loading is clarified. In addition, the rock blasting under in-situ geo-stress is simulated as a combined static, dynamic and static process, i.e. the rock damage process under consecutive contribution of quasi-static geo-stress, blasting stress wave and quasi-static explosion gas pressure. Based on which, the effect of geo-stress condition on the blasting damage of rock is examined.