Based on track vibrating acceleration data measured from tunnels of Shanghai Metro Project

the numerical simulations by using 3D and 2D FEM are carried out in order to understand the dynamic response of overlap tunnels in close proximity to Nanpu Bridge Project due to the train’s vibrating load. The follwing conclusions are given: 1.mutual influences between the overlap tunnels are much greater than the parallel ones; 2. the longer the distance between the tunnels

the less the mutual influences; 3. for the tunnel structure design

the static soil pressure is the key load

and the additional stress induced by the train’s vibrating load is much smaller than the stress induced by the static load.