| 基床翻浆条件下无砟轨道路基振动特性研究 |
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| 引用本文： | 张文超,苏谦,刘亭,刘宝,孙文.基床翻浆条件下无砟轨道路基振动特性研究[J].岩土力学,2014,35(12):3556-3562. |
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| 作者姓名： | 张文超 苏谦 刘亭 刘宝 孙文 |
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| 作者单位： | 1. 西南交通大学 土木工程学院，成都 610031；2. 西南交通大学 高速铁路线路工程教育部重点实验室，成都 610031 |
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| 基金项目： | 教育部新世纪人才计划项目（No. NCET-12-0941）；中央高校基本科研业务费专项资金科技创新项目（No. A0920502051413-63）；铁道部科技研究开发计划（No. 2012G009-A）。 |
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| 摘 要： | 无砟轨道路基翻浆是近年高速铁路路基出现的特殊病害形式,为研究基床翻浆对无砟轨道路基动力特性的影响,在沪宁城际路基翻浆工点进行了病害勘查和现场行车试验,分析了列车荷载作用下翻浆段无砟轨道路基振动特性。结果表明:无砟轨道路基翻浆病害的形成主要与基床表层级配碎石细粒含量较高以及底座板伸缩缝、侧缝封闭不严有关;基床翻浆导致路基对轨道结构支承及约束作用降低,加剧了无砟轨道结构的振动,其中底座板振动放大效应尤其明显,且振动放大效应随车速增加而增大;基床翻浆改变了无砟轨道与路基基床间振动波传递状态,限制了路基基床参振耗能作用的发挥,翻浆断面路基面动位移幅值减少45%,底座板到路基面动位移传递函数减小约2/3,当列车速度为247 km/h时,在路基受动荷载主要作用频率范围内(015 Hz),其动位移传递函数处于0.2215 Hz),其动位移传递函数处于0.220.39间。
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| 关 键 词： | 无砟轨道路基 基床翻浆 振动特性 传递函数 |
| 收稿时间： | 2014-07-15 |
Research on vibration characteristics of ballastless track subgrade under frost boiling at subgrade bed |
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| ZHANG Wen-chao,SU Qian,LIU Ting,LIU Bao,SUN Wen.Research on vibration characteristics of ballastless track subgrade under frost boiling at subgrade bed[J].Rock and Soil Mechanics,2014,35(12):3556-3562. |
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| Authors: | ZHANG Wen-chao SU Qian LIU Ting LIU Bao SUN Wen |
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| Institution: | 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | The subgrade frost boiling under ballastless track is a special form of high-speed railway subgrade defects appearing in recent years. In order to study the effect of the frost boiling on dynamic characteristics of ballastless track subgrade, in-situ survey and train-induced vibration tests were carried out in Shanghai-Nanjing intercity railway defects section. The vibration characteristics of ballastless track subgrade under the condition of forst boiling are analyzed. The results show that the subgrade frost boiling mainly resulted from the high content of fine particles in graded gravel and the cracking in expansion joints and side joints of foundation plate. The frost boiling at subgrade bed reduces the support and constraint effect of subgrade on the ballastless track, and intensifies the vibration of ballasted track structure, especially to the foundation plate of ballastless track. The vibration amplification effect increases with the increase of train speed. The defect also changes vibration wave transmission between ballastless track and subgrade bed, which restricts the energy dissipation function of subgrade bed. When the train speed reaches 247 km/h, the amplitude of vibration displacement at the surface of subgrade reduces by 45%. The vibration displacement transfer function from the foundation plate to subgrade bed decreases by 2/3, and the value is between 0.22-0.39 in dynamic loading mainly frequency range (0~15Hz) of the subgrade. |
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| Keywords: | ballastless track subgrade frost boiling at subgrade bed vibration characteristics transfer function |
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