Research on Dynamic Response Law of Shield Tunnel and Surrounding Soil Based on Vibration Action of Subway Train

In order to study the influence of the dynamic response of the soil around the tunnel under the train load in the small radius curve section, the pore water pressure and water level were measured in the field, and the numerical analysis was performed using the finite element software MIDAS. The results show that the vibration load is the important reason for the change of pore water pressure during the operation of the tunnel, the deeper the hole pressure gradually decreases; the closer to the tunnel, the more sensitive is the response to the train vibration dynamic response, the change amplitude and rate of pore water pressure and vertical deformation peak of the water in the soil are larger; the dynamic response of the soil at the bottom of the small radius curve tunnel increases with the train speed; the superpore water pressure generated by the soil is gradually dissipated, it can be predicted that the deformation damage to the surrounding soil with the train vibration.