Abstract

Info

Title:: Numerical Prediction of Ground Vibration Induced by Subway Based on Vibration Source and Propagation Model

Author(s):: XU Rui; LI Xun-chang; CHENG Hui; XUE Song-tao; School of Geology Engineering and Geomatics, Chang’an University

Keywords:: ground vibration; dynamic finite element model; exciting force; track irregularity power spectrum; vibration source and propagation model

Abstract:: On the purpose of studying on ground vibration induced by subway, the vibration source model was applied to calculate the exciting force caused by different train speeds, and the propagation model was applied to calculate the ground vibration caused by different exciting forces, then the dynamic finite element model of “metro-tunnel-soil” system was established. By contrasting the numerical results and measured results, the influence law of ground vibration affected by different factors was analyzed. The results show that the exciting force and the ground vibration acceleration increase obviously with the increase of train speed; the ground vibration acceleration peak value decreases significantly as the distance to tunnel increases, and their relationships with the distance can be represented by power function within 30 m range from center line of subway; the ground vibration acceleration frequency is mainly concentrated in low frequency, and the highfrequency actuation is more obvious than low frequency actuation; it is recommended to take construction gauge outside 20 m of center line of subway, or reduce the design speed and the vehicle load, or optimize vibration isolation measure, to reduce environmental impact of local residents in Shanghai area.