Research on dynamic response to vibration loads caused by
train for doube-circular tunnel |
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| Authors: | WU Xiang-song ZHU He-hua YUAN Hai-ping |
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| Institution: | 1.Key Laboratory of Geotechnical Engineering, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2.School of Civil and Architectural Engineering, Central South University, Changsha 410083, China |
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| Abstract: | 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. |
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| Keywords: | double circular subway load caused by vibration load modal analysis transient analysis dynamic response |
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