Study on Dynamic Response of Different Surrounding Rock Levels on Both Sides of Tunnel Fault Fracture Zone

Junpeng Zhu

Chongqing Jiaotong University, Chongqing, 400074, China

Abstract: In this paper, based on the explicit difference method of a compound line railway tunnel, the seismic dynamic response numerical simulation is carried out on the stiffness and the different width of different surrounding rock on the two sides of the fault-crushing zone based on the explicit difference method, and the width of the different crushing belt is analyzed to be under the action of the earthquake, The displacement, velocity and stress response of the control points are monitored in the tunnel lining with different stiffness ratio of the surrounding rock at both sides. The data analysis shows that with the increase of the stiffness ratio of the rock mass on both sides of the fault-breaking zone, the stress of the lining under the action of the earthquake is increased sharply, and the tunnel is damaged under the condition of the earthquake intensity level and the stiffness ratio of the rock mass on both sides. The results of these studies And can provide reference for the structural design of the tunnel anti-seismic structure at the fault-breaking belt.

Keywords: Fault broken zone; Mountain tunnel; Dynamic response; Stiffness