遂渝线无碴轨道桩板结构路基动力响应现场试验研究
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摘要
通过遂渝线现场实测,对CRH2动力分散型机车在桩板结构路基试验段高速行车条件下的动响应规律进行了研究,分析路基动力响应和列车速度的关系以及动应力沿路基深度方向的变化规律等。结果表明:随车速的增大,动位移、加速度及动应力均有不同程度的增加,并在临界速度附近先增大后减小;动应力随路基深度的增加衰减很快,并且随着深度的增加,动应力值和静态应力值越来越接近;桩底土动应力较大,桩基加深了路基的动力影响范围,改善了路基土体部分的受力状态。
Based on the field test in Suining-Chongqing High-speed Railway, the dynamic responses of pile-plank embankment, on which a disperse impetus locomotive CRH2 with high speed is running, are studied; the relationship between the dynamic responses and the train speed is analyzed; the changes of dynamic stress along the depth of subgrade is analyzed. The analyses indicate that the displacement, acceleration and dynamic stress increase in various degrees while the train speed increases, and they increase first and then decrease at the critical velocity. The dynamic stress attenuates fast with increasing depth of the subgrade, while increasing the depth, dynamic stress is closer to the static stress. Dynamic stress at pile-bottom soil is biggish, and pile structure expands the depth of the dynamic response of roadbed and improves the stress of the roadbed soil.
Based on the field test in Suining-Chongqing High-speed Railway, the dynamic responses of pile-plank embankment, on which a disperse impetus locomotive CRH2 with high speed is running, are studied; the relationship between the dynamic responses and the train speed is analyzed; the changes of dynamic stress along the depth of subgrade is analyzed. The analyses indicate that the displacement, acceleration and dynamic stress increase in various degrees while the train speed increases, and they increase first and then decrease at the critical velocity. The dynamic stress attenuates fast with increasing depth of the subgrade, while increasing the depth, dynamic stress is closer to the static stress. Dynamic stress at pile-bottom soil is biggish, and pile structure expands the depth of the dynamic response of roadbed and improves the stress of the roadbed soil.
引文
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[2]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基的设计及计算[C]//中国铁道学会.第二届中国交通土建工程学术交流会论文集.成都:西南交通大学出版社,2006:723-729.
[3]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基在地震荷载下的动力响应分析[J].中国铁道科学,2006,27(6):22-26.ZHAN Yong-xiang,JIANG Guan-lu,WEI Yong-xing.Dynamic response analysis on the pile-plank structure roadbed of ballastless track under earthquake load[J].China Railway Science,2006,27(6):22-26.
[4]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.
[5]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.
[6]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.
[7]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.
[8]中华人民共和国行业标准编写组.京沪高速铁路设计暂行规定[S].北京:中国铁道出版社,1998.
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