无碴轨道路基基床动力特性的研究
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摘要
以遂渝线无碴轨道路基为背景,通过室内模型试验研究,分析了在循环加载条件下路基基床的动态力学特性。试验结果表明,动应力响应在基床表层横断面方向上呈"W"形分布,混凝土基础板轨下位置响应最大,中线处和端部响应较小,但随着深度的增加,逐渐变为盆形分布特征;在基床表层范围内,动态响应最为强烈,且随深度的增加,衰减速率较快;加载频率对动应力影响较小,对动位移及加速度影响较大。另外,在遂渝线无碴轨道综合试验段现场实车试验中,分别进行了CRH2型动车组和货物列车不同运行速度下路基基床的动力学响应测试研究,验证并评价了遂渝线无碴轨道路基基床工程适应性。
Based on Suining-Chongqing high speed railway, the dynamic characteristics of ballastless track soil subgrade are analyzed through an indoor large-scale model test under dynamic loading. The result indicates that along the subgrade surface cross section, dynamic responses have the W-shaped distribution. But gradually become the basin-shaped distribution with the increase of depth. The largest dynamic response measured are under the concrete track position base, while the responses under the centre-line and the two ends of the concrete slab are smaller. The most intense dynamic responses are measured on the surface and graded gravel area; it reduces sharply with the increase of depth. Dynamic stress is slightly affected by loading frequency, while acceleration and dynamic deformation are fairly affected by it. In addition, a comprehensive field test has been conducted on the test course in Suining-Chongqing line by using CRH2-EMUs and freight train. The dynamic response of ballastless track subgrade under diffident speeds have been collected and the dynamic characteristics are analyzed. The results verify the suitability and adaptability of subgrade construction on Suining-Chongqing line.
Based on Suining-Chongqing high speed railway, the dynamic characteristics of ballastless track soil subgrade are analyzed through an indoor large-scale model test under dynamic loading. The result indicates that along the subgrade surface cross section, dynamic responses have the W-shaped distribution. But gradually become the basin-shaped distribution with the increase of depth. The largest dynamic response measured are under the concrete track position base, while the responses under the centre-line and the two ends of the concrete slab are smaller. The most intense dynamic responses are measured on the surface and graded gravel area; it reduces sharply with the increase of depth. Dynamic stress is slightly affected by loading frequency, while acceleration and dynamic deformation are fairly affected by it. In addition, a comprehensive field test has been conducted on the test course in Suining-Chongqing line by using CRH2-EMUs and freight train. The dynamic response of ballastless track subgrade under diffident speeds have been collected and the dynamic characteristics are analyzed. The results verify the suitability and adaptability of subgrade construction on Suining-Chongqing line.
引文
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[3]詹永祥,蒋关鲁,牛国辉,等.桩板结构路基动力模型试验研究[J].岩土力学,2008,29(8):2097-2101.ZHAN Yong-xiang,JIANG Guan-lu,NIU Guo-hui,et al.Model experimental research on dynamic performance of pile-plank embankment[J].Rock and Soil Mechanics,2008,29(8):2097-2101.
[4]卿启湘,王永和,赵明华.秦沈客运专线路桥(涵)过渡段路基的动力特性分析[J].岩土力学,2008,29(9):2415-2421.QING Qi-xiang,WANG Yong-he,ZHAO Ming-hua.Research on dynamic performance of bridge(culvert)-subgrade transition section on Qin-Shen High-speed Railway[J].Rock and Soil Mechanics,2008,29(9):2415-2421.
[5]邱延峻,张晓靖,魏永幸.列车速度对无碴轨道路基动力特性的影响[J].交通运输工程学报,2007,7(2):1-5.QIU Yan-jun,ZHANG Xiao-jing,WEI Yong-xing.Influenced of train speed on dynamic characteristics of ballastless track subgrade[J].Journal of Traffic and Transportation Engineering,2007,7(2):1-5.
[6]金亮星,乔世范.车辆-轨道-路基系统垂向动力分析模型的试验验证[J].振动与冲击,2008,27(3):38-41.JIN Liang-xing,QIAO Shi-fang.Test verification ofvertical dynamic analysis model of vehicle-track-subgrade system[J].Journal of Vibration and Shock,2008,27(3):38-41.
[7]中华人民共和国铁道部.TB10001-2005铁路路基设计规范[S].北京:中国铁道出版社,2005.
[8]蒋关鲁,刘先锋,张建文,等.高速铁路液化土地基加固的振动台试验研究[J].西南交通大学学报,2006,41(2):190-196.JIANG Guan-lu,LIU Xian-feng,ZHANG Jian-wen,et al.Shaking table test of composite foundation reinforcement of saturated silty ground for high speed railway[J].Journal of Southwest Jiaotong University,2006,41(2):190-196.
[9]日本鉄道総合技術研究所.基礎構造物-抗土圧構造物[M].日本:丸善株式会社出版,1997.
[10]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LING Xian-zhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction of pile-soil-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.
[11]吕西林,陈跃庆.结构-地基动力相互作用体系振动台模拟试验研究[J].地震工程与工程振动,2000,20(4):30-36.LüXi-lin,CHEN Yue-qing.Study on dynamic similitude theory of soil-structure interaction system[J].Earth-quake Engineering and Engineering Vibration,2000,20(4):30-36.
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