Derailment Behaviors of the Train-Ballasted Track-Subgrade System Subjected to Earthquake Using Shaking Table
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0005-6
Railroad Engineering
Derailment Behaviors of the Train-Ballasted Track-Subgrade System Subjected to Earthquake Using Shaking Table Licong Cao
a
, Changwei Yang
a
, and Jianjing Zhang
a
a
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
ARTICLE HISTORY
ABSTRACT
Received 9 January 2020 Revised 7 April 2020 Accepted 19 May 2020 Published Online 5 August 2020
Ballasted track is the most common track model in railway system and earthquake would be a great threaten for train running safety. This study investigates derailment features and lateral displacement response of the train-ballasted track-subgrade system subjected to earthquake using 1-g shaking table. The model was loaded using scaled Zhengzhou Huanghe Qiaozhi (ZHQ) earthquake wave, ALS earthquake and CHY004 earthquake which are with variablecharacters. It is observed that current stopping threshold for train is conservative because derailment factor is less than 0.8. The derailment factor of train increase with increasing acceleration amplitude and the critical derailment condition of train under ZHQ earthquake, ALS earthquake and CHY004 earthquake is 0.18 g, 0.15 g and 0.15 g, respectively. The lateral displacement of rail is negligible compared with that of wheel. Lower-frequency earthquake would cause larger derailment factor with derailment analysis and displacement analysis. The maximum peak lateral displacement of wheel under critical derailment condition is significant, which means train safety is under a great danger.
KEYWORDS Earthquake response Derailment Subgrade Ballast 1-g shaking table test
1. Introduction Railway transportation networks are vital part of significant infrastructures for every country. Ballasted track is the most common track model in railway system for its good elasticity, low cost, easy to construct and maintain and it is with a percentage of more than 95% (Jing, 2012). Ballasted track also has been widely used for high-speed railway (HSR) construction with speed of 250 km/h in China. For example, Beijing-Zhangjiakou high speed line and Shangqiu-Hangzhou high speed line which are under construction also adopt ballasted track. The possibility of a train that coincidentally runs over an earthquake zone would increase because that 50% of the land area in China is located in the high-intensity area of earthquakes greater than degree VII (GB/T 17742-2008, 2008). When the Tangshan earthquake with magnitude of 7.8 occurred in 1976, 7 freight trains and 2 passenger trains were turned over and derailed. 7 of 10 train carriages derailed in 2004 Japan Niigata earthquake, while the substructure was not damaged (Koyama et al., 2005). The dynamic response of ballast track during earthquake is complicated and the behaviors have been studied by some researchers. Sogabe et al. (2013) studied the deformation behaviors CORRESPONDENCE Changwei Yang ⓒ 2020 Korean Society of Civil Engineers
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