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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2015 Vol.16 No.12 P.976-986
Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics
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
创新点:系统地对比CA砂浆软化对车辆-轨道动力学特性和轨道层间破坏的影响,为工程实际提供参考。
方法:1. 通过建立三维车辆-轨道耦合动力学模型以及CA砂浆软化模型,分析CA砂浆软化对行车安全以及轨道动力特性的影响(图2);2. 通过轨道-路基非线性有限差分耦合模型,分析CA砂浆软化对轨道层间破坏的影响(图3)。
结论:通过车辆运行安全性分析、轨道位移限值分析以及轨道层间失效分析,得出以下结论:1. CA砂浆软化系数达到10~100时,轨道层间剪切失效开始快速发展;2. CA砂浆软化系数不能超过1000,当CA砂浆软化系数超过该值时,高速列车将面临脱轨危险。
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DOI:
10.1631/jzus.A1500080
CLC number:
U270
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On-line Access:
2015-12-04
Received:
2015-04-04
Revision Accepted:
2015-08-31
Crosschecked:
2015-11-10