Study on Simulation of Rock dynamic failure law of crack under pre-stress condition

In this paper, numerical rock samples are used, and the angle between prefabrication and loading direction is 0
⁰
~90
⁰
. The split Hopkinson bar (SHPB) is used as the dynamic loading system to analyze the instability and failure characteristics of the samples under different crack angles. The crack initiation mode and strength law of jointed rock mass under dynamic loading are revealed, and the mechanical failure model of rock mass under the condition of multi-angle joints is established, which truly reflects the crack propagation mechanism of rock mass under dynamic loading.