Full Text:   <1900>

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CLC number: U270

On-line Access: 2015-12-04

Received: 2015-04-04

Revision Accepted: 2015-08-31

Crosschecked: 2015-11-10

Cited: 8

Clicked: 2466

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jian Han

http://orcid.org/0000-0002-7891-7164

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.12 P.976-986

http://doi.org/10.1631/jzus.A1500080


Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics


Author(s):  Jian Han, Guo-tang Zhao, Xin-biao Xiao, Ze-feng Wen, Qing-hua Guan, Xue-song Jin

Affiliation(s):  1State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   xsjin@home.swjtu.edu.cn

Key Words:  High-speed railway, Cement asphalt mortar (CAM) softening, Vehicle-track coupling dynamics, Operation safety, Track damage


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[J]. Journal of Zhejiang University Science A, 2015, 16(12): 976-986.

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author="Jian Han, Guo-tang Zhao, Xin-biao Xiao, Ze-feng Wen, Qing-hua Guan, Xue-song Jin",
journal="Journal of Zhejiang University Science A",
volume="16",
number="12",
pages="976-986",
year="2015",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1500080"
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%T Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics
%A Jian Han
%A Guo-tang Zhao
%A Xin-biao Xiao
%A Ze-feng Wen
%A Qing-hua Guan
%A Xue-song Jin
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500080

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T1 - Effect of softening of cement asphalt mortar on vehicle operation safety and track dynamics
A1 - Jian Han
A1 - Guo-tang Zhao
A1 - Xin-biao Xiao
A1 - Ze-feng Wen
A1 - Qing-hua Guan
A1 - Xue-song Jin
J0 - Journal of Zhejiang University Science A
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DOI - 10.1631/jzus.A1500080


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.

Cement asphalt mortar (CAM) is vastly used in the structure of high-speed railroad system, serving as a cushion layer between the slab and concrete base. In practice, deterioration and even failure of CAM layer often occur seriously after some years of service. As an organic-inorganic composite material, many factors, including rain soaking, fatigue are involved in the deterioration process of CAM. This paper is focusing on the effect of CAM softening on the vehicle operation and track damage by using the developed coupling dynamic model. The topic of this paper is highly relevant to the high-speed railway practice and the findings are very highly valuable for understanding the risk of CAM deterioration in the whole high-speed railway system.

沥青混凝土砂浆层软化对车辆行驶安全性和轨道动力特性的影响

目的:对于高速铁路,老化和雨水冲刷浸泡将导致无砟轨道水泥沥青砂浆(CA砂浆)软化现象。CA砂浆的软化严重影响轨道动力特性,甚至危害高速列车行车安全。通过仿真计算,系统地调查CA砂浆软化对高速列车行车安全以及轨道动力特性的影响。
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。

关键词:高速铁路;CA砂浆软化;车辆-轨道耦合动力学;运行安全性;轨道破坏

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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