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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

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文章编号:1672-7207(2019)01-0234-07
复合轨枕有砟轨道动力性能试验研究
赵振航1,沈毓婷1,魏强2,江万红3,耿浩1,李成辉1

(1. 西南交通大学 高速铁路线路工程教育部重点实验室,四川 成都,610031;
2. 中国铁路总公司 工程管理中心, 北京,100038;
3. 中铁二院工程集团有限责任公司,四川 成都,610031
)

摘 要: 为研究复合轨枕有砟轨道动力性能,试验铺设轨道结构实尺模型,采用落轴冲击的方法,测试不同落轴高度冲击下钢轨、轨枕、道床、基础的加速度及钢轨的应变,并推算轨道动刚度和阻尼。研究结果表明:与弹性轨枕有砟轨道对比,复合轨枕钢轨加速度较大,衰减快;复合轨枕道床和基础加速度峰值略小,道床衰减较慢;2种轨道结构基础加速度衰减均较慢;在1~10 Hz范围内,复合轨枕振动能量较大,减小了其轨道钢轨和基础的振动,使得2种轨道动力特性差异较大;2种轨道弹性均很好,使得动刚度较小,复合轨枕和弹性轨枕轨道动刚度分别为28~32 kN/mm和38 kN/mm,阻尼分别为170~195 kN?s/m和146~178 kN?s/m。从减振性能角度考虑,复合轨枕有砟轨道效果更好。

 

关键字: 振动;复合轨枕;动刚度;阻尼

Experimental study on dynamic performance of composite sleeper ballasted track
ZHAO Zhenhang1, SHEN Yuting1, WEI Qiang2, JIANG Wanhong3, GENG Hao1, LI Chenghui1

1. MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Engineering Management Center of China Railway Corporation, Beijing 100038, China;
3. China Railway Eryuan Group Ltd, Chengdu 610031, China

Abstract:A full-scale model was built in order to study the dynamic performance of composite sleeper ballasted track, including vertical accelerations of rail, sleeper, ballast bed, foundation and strain of rail under wheel-drop loads of different heights. Dynamic stiffness and damping coefficient of the composite sleeper ballasted track were deduced. The results show that composite sleeper track structure offers larger vibration acceleration and faster attenuation of rail compared with the test results of elastic sleeper ballasted track. It also offers smaller vibration accelerations of ballast bed and foundation, and the ballast bed decays more slowly. The acceleration attenuation of the two track foundations is slow. Composite sleeper possesses more vibration energy and reduces the vibration of rail and foundation at 1-10 Hz, which leads to the great difference in the dynamic behaviors of the two tracks. The two tracks both have good elasticity and make dynamic stiffnesses smaller. The dynamic stiffnesses of composite sleepers and elastic sleepers are respectively 28-32 kN/mm and 38 kN/mm, and the damping coefficients are 170-195 kN?s/m and 146-178 kN?s/m respectively. Composite sleeper track has better vibration reduction effect.

 

Key words: vibration; composite sleeper; dynamic stiffness; damping

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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