Numerical Analysis of Mechanical Response Characteristics of Jointed Tunnel Surrounding Rock under Dynamic Loading

The jointed rock mass is widely distributed in nature, which has certain impact on the stability of the underground tunnel. In order to study the response characteristics of jointed tunnel surrounding rock mass under dynamic loading such as earthquake and explosion, the tunnel surrounding rocks with different distributed joints are simulated and studied by RFPA numerical analysis method, and the failure process of tunnel surrounding rock is obtained. The numerical results show that under the action of dynamic loading, the tunnel surface reflects the stress wave and form a tensile failure zone, resulting in serious instability and failure in the zone; The stability of tunnel surrounding rock is closely related to the distribution of joints; The interaction between tunnels increases the failure of surrounding rock mass, so a safe distance should be maintained between tunnels. The research results of this paper provide guidance for tunnel route selection and surrounding rock reinforcement design.