In soft soils

the long-term settlement of shield tunnel induced by various factors has been a major threat to the tunnel safety.The vehicle vibration is one of the key factors inducing the long-term settlement of shield tunnel.In this paper

the effect of vehicle vibration coupled with underground water was studied using the finite difference software（FDM）FLAC.The vehicle dynamic load was simulated by Artificial Numbered Excitation Function and implemented by using FISH language（an embedded language of FLAC）.The dynamic calculation and dynamic flow-solid coupling calculation were conducted combined with the empirical method

respectively

to sort out the impact of train load from underground water.The impact of underground water on the long-term behavior of shield tunnel was highlighted.The long-term settlements of shield tunnel and ground caused by the vehicle vibration increased more significantly in the first 10 years of operation.The existing of underground water could increase the long-term settlement slightly.