Abstract: According to the soft soil engineering cases in Shanghai, several vibration field measurements of the vertical acceleration of tunnels and buildings is carried out to evaluate the damping effect of urban subway transit. Then, the combined finite element method and the infinite element method are adopted to investigate the variation of structural vibration induced by urban subway transit with the floor level. Comparing the numerical results and the field measurement, it can be concluded that: 1) The vibration level in tunnel decreases by 16 dB and the vibration level in the floor decreases by 10.9-21.1 dB after the damping, which indicates that the damping effect is obvious; 2) The vibration level in the floor decreases and then increases as the floor increases; 3) The vibration level of the floor calculated by the proposed numerical model shows a better consistency with the measurement result, which shows the proposed analysis method is reasonable and feasible, and it provides an effective way for predicting the vibration level of buildings around the subway.

Key words: subway, environmental vibration, structure vibration；vibration measurement, numerical simulation, soft soil