Based on the engineering of double circular shield tunnel of Shanghai metro Yangpu Line(M8) between the railway stations of Huangxinlvdi and Xiangyin Road

research the law of dynamic response of double circular shield runnel in soft soil under vibration loads caused by the train. After the modal analysis of the system of metro shield tunnel and stratum

its vibration pattern and frequency can be obtained; so the rational time step and damping of vibration analysis are defined by vibration modes and frequencies obtained with modal analysis. Adopting the modal of vehicle-tramroad

the vibration loads caused by the train are calculated; then the initial in-situ stresses is defined

with the transient analysis

under the two kinds of vibration loads of single train and two trains

the random dynamic response of the double circular tunnel subway in soft soil can be obtained

and its weak parts and their displacement field and stress field are obtained; so when designing the two-circle shield tunnel in soft soil

the loads caused by the vibration of trains should be considered.