As one kind of long linear underground structure, the longitudinal response is a very important issue for seismic design of tunnels. In order to study the longitudinal seismic response of the tunnel, the dynamic problem of the tunnel structure under the action of the seismic deformation field is first simplified to pseudo-static interaction between soil and tunnel, and the response acceleration method of the pseudo-static interaction model of the soil-tunnel is derived. Then, based on the longitudinal displacement mode, the response acceleration method for longitudinal seismic analysis of tunnel is built, by offering formulas of the equivalent body forces and the boundary conditions. The developed method is employed to study the tunnel response with different ground conditions and buried depths. The result is compared with that of the integrated seismic displacement method. Through the analysis of the numerical results, some conclusions can be drawn: (1) When the site conditions and buried depth are the same, the bending moment of the tunnel increases with the increase of the horizontal displacement of the site, while the shear force and torque have opposite changes; (2) The ground condition has a significant effect on the tunnel internal forces. The softer the ground condition, the larger the bending moment and torsion the tunnel suffers, but the smaller the shear force of the tunnel; (3) With the tunnel depth increasing, the shear force and bending moment gradually decrease. However, the tunnel depth has a slight effect on the torsion.
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