Study on Response and Influencing Factors of Shield Single/Twin Tunnel under Seismic Loading using FLAC 3D

The research on the dynamic response and influencing factors of shield tunnel lining under earthquake demonstrates significant engineering value in guiding design antiseismic tunnels. In this paper, a nonlinear finite element model soil-tunnel interaction is established based FLAC difference software, then Mohr–Coulomb elastoplastic plastic damage are used to simulate characteristics soil tunnel, seismic waves South Iceland selected analyze residual internal force, force distribution, relative deformation top bottom arch load. Meanwhile, effects depth thickness, diameter discussed. addition, law horizontal parallel amplification effect surface acceleration also studied. results show that action strong earthquake, bearing capacity decreases sharply, destroyed, large appears. When buried small, more significant, R increases at first with increase acceleration. maximum bending moment axial aggrandize obviously thickness. particular, has redistribution deflection condition small Moreover, tunnels affects distribution magnitude adjacent