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  Study on numerical simulation of seismic response for underground tunnel across fault

  Fault fracture zone is the seismic weak link of tunnel structure. Aimed at the dynamic interaction characteristics between surrounding rock and fault under seismic load, a dynamic contact force method considering several contact states is built. Considering point to point and point to surface contact in finite element model, the method can simulate four contact states between the rock and fault: bonded contact, static contact, separation and sliding contact, which is suitable for studying nonlinear large slip problem of dynamic contact system composed of the rock and fault under seismic load. First, the method rationality is verified by a sliding block example. Then, the seismic stability of Xianglushan tunnel in Dianzhong diversion project across fault is studied. The influence of dynamic contact between the rock and fault on the seismic response of tunnel structure is analyzed. The results indicate that, when considering the dynamic contact, obvious dislocation displacement forms between the rock and fault during seismic loading procedure, which leads to a significant increase of the lining displacement and stress. The hanging wall lining is greatly affected by the fault under seismic load, and the lining near the interface between the hanging wall and fault is the most seriously damaged. The displacement, stress and damage coefficient of the lining haunch are significantly larger than that of the top and bottom arch. The haunch is considered as the weak part of lining structure. The numerical simulation reveals the seismic response characteristics and failure mechanisms of deep buried underground tunnel across fault, and provides an effective analysis method for its seismic design. Underground tunnel; Fault fracture zone; Dynamic contact force method; Lining structure; Seismic response; Numerical simulation.

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