Abstract：The environmental vibration caused by the simultaneous operation of rail trains in overlapping or close tunnels is higher than that under a single train load.Its quantitative calculation and forecasting is an urgent problem to be solved.A finite element model for analysing the close parallel tunnel-ground structure based on Suzhou Rail Transit Line 4 was established to study its ground vibration responses.The characteristics of ground vibration responses were studied under different train loads combinations,different depth and distance between the two tunnels.The numerical simulation results were processed by using polynomial fitting to get an empirical formula under double train loads.The results can provide references to engineering design and environmental assessment in future.
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