Based on the Xiamen Metro Line 3 project,a soil-shield tunnel interaction model was established using FLAC 3D software combined with an elastic-plastic model reflecting concrete damage model.The liquefaction development law of backfill sand stratum under earthquake action and the dynamic response characteristics of shield tunnels were explored.The results show that under seismic loads,the pore water pressure and effective stress at the locations far away from the shield tunnel gradually increase and eventually stabilize,while the effective stress first decreases and then increases near the shield tunnel,and the excess pore water pressure first increases and then decreases.At the end of the earthquake,the maximum damage value of the pipe segment is between the arch waist and the arch foot,however,it is far less than the damage limit of the concrete.The damage increment caused by earthquakes is the smallest at the top and bottom of the arch,and the largest near the waist and foot of the arch.Therefore,the section from the waist to the foot of the arch is the most unfavorable part of the seismic resistance of the tunnel lining structure.
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