Abstract
Aiming at insufficient analysis and research on seismic response of multi-arch tunnel, establish numerical analysis model by FEM. Initial stress and displacement field of tunnel structural system under static force are firstly obtained, then dynamic response analysis are carried out for tunnel structural system on the basis of Johnson-Epstein acceleration time-history curve which is equivalent to El-Centro. Results indicate that horizontal displacement of structural system is far more than vertical displacement under the action of horizontal seism, thus it should pay more attention to ground deformation caused by oscillation of shallow tunnel under action of seismic load. Top of middle wall is the weakest part of multi-arch tunnel in seismic resistance, followed by bottom of middle wall.
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