近走滑断层山岭隧道全过程地震响应研究OA

A coupled indirect boundary element method(IBEM)-finite element method(FEM)framework was proposed for simulating the full-process seismic response of fault rupture,site amplification,and struc-tural damage.This method combines the unique advantages of IBEM in handling fault and large-scale complex site problems with the flexibility of FEM in simulating nonlinear seismic responses of engineering structures.The accuracy of the coupled method was verified through model calculations and comparisons with IBEM simulation results.Furthermore,using a near strike-slip fault mountain tunnel model,the method was applied to study the influence of different fault rupture velocities on the seismic response of the mountain tunnel struc-ture under a set magnitude of Mw6.7.The results indicate that with increasing fault rupture velocity,both the equivalent plastic strain of the tunnel and the extent of structural damage are significantly intensified.In par-ticular,under super-shear rupture conditions,the distribution of tunnel space exhibits markedly greater non-uniformity.Therefore,in near-fault regions,the seismic design of mountain tunnels should specifically focus on preventing super-shear rupture and improving their adaptability and seismic resilience under extreme earthquake conditions.