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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2015, Vol. 16 Issue (12): 976-986    DOI: 10.1631/jzus.A1500080
Transportation Engineering     
Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics
Jian Han, Guo-tang Zhao, Xin-biao Xiao, Ze-feng Wen, Qing-hua Guan, Xue-song Jin
1State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China; 2China Railway Corporation, Beijing 100844, China
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Abstract  Cement asphalt mortar (CAM) softening is a common phenomenon that results from ageing and rain soaking when a high-speed railway is in service. CAM softening seriously affects vehicle operation safety and track dynamics. In this paper, a 3D coupling dynamic model of a vehicle and a China railway track system I (CRTS-I) slab track is developed. By using the proposed model, the wheel-rail contact forces, derailment coefficient, wheelset loading reduction ratio, and the track displacements are calculated to study the influences of CAM softening on the dynamic characteristics of a vehicle-track system. A track-subgrade finite difference model is developed to study the effect of CAM softening on track damage. The results show that track interface shear failure develops when the CAM softening coefficients reach 10–100. The CAM softening coefficient should not be less than 1000, otherwise a high-speed running vehicle may risk derailment.

Key words： High-speed railway      Cement asphalt mortar (CAM) softening      Vehicle-track coupling dynamics      Operation safety      Track damage     
Received: 04 April 2015      Published: 04 December 2015
CLC:  U270  
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Jian Han
Guo-tang Zhao
Xin-biao Xiao
Ze-feng Wen
Qing-hua Guan
Xue-song Jin
Cite this article:

Jian Han, Guo-tang Zhao, Xin-biao Xiao, Ze-feng Wen, Qing-hua Guan, Xue-song Jin. Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(12): 976-986.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1500080     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2015/V16/I12/976

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