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| Dynamic response and running safety evaluation of a strengthened embankment-train system during earthquake |
| YANG Xun 1，LOU Yunfeng 2, SHI Yazhou 3,CHEN Rong 4, JIN Xianlong 5 |
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
2. Aeros Pace System Engineering Shanghai, Shanghai 201108, China;
3. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China;
4. 704 Research Institute, China Shipbuilding Industry Corporation, Shanghai 200031, China;
5.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract Taking a subgrade line and the running train as research objects, a finite element model of the train-embankment-soil dynamic coupling system was established taking account of the nonlinear material behavior of soil, the viscous-spring artificial boundary, and the dynamic contact between structures.The Drucker-Prager material model was adopted and modified.Making use of the penalty function, the vertical contact interface and the lateral contact interface between the wheel and the rail surface were considered as automatic surface-to-surface contact.The seismic responses of the embankment foundation before and after reinforcement were analyzed.The influence of residual deformation after earthquake on the derailment safety of the running train was discussed.The results show that the dynamic responses of the train and the safety of running train subjected to earthquake are significantly affected by the reinforcement of soft subgrade.After strengthening, the derailment factor, the offload ratio, and the acceleration of the vehicle body are significantly reduced.
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Received: 11 December 2018
Published: 15 July 2020
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