| 高速铁路CFG桩-筏复合地基桩侧负摩阻力及其受力特点的试验研究 |
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| 引用本文： | 曾俊铖,张继文,童小东,涂永明.高速铁路CFG桩-筏复合地基桩侧负摩阻力及其受力特点的试验研究[J].铁道科学与工程学报,2009,6(4). |
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| 作者姓名： | 曾俊铖 张继文 童小东 涂永明 |
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| 作者单位： | 东南大学,土木工程学院,江苏,南京,210096 |
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| 基金项目： | 铁道部重点科研项目(2007G046) |
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| 摘 要： | 通过京沪高速铁路CFG桩-筏复合地基的现场试验研究,获得了桩身弹性模量及路堤填筑过程及路基静置期间的桩身应变,分析了CFG桩身轴力和负摩阻力的变形规律.结果表明,在路堤填筑期间,负摩阻力就已经存在,桩身轴力随着深度的增加先增大后减小;静置期间,桩身负摩阻力和轴力仍有明显增长.桩身负摩阻力与路基填筑高度和固结时间密切有关.
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| 关 键 词： | 高速铁路 CFG 桩-筏 复合地基 负摩阻力 |
Experimental study on negative skin friction and mechanical behavior of high-speed railway CFG pile-raft composite foundation |
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| ZENG Jun-cheng
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ZHANG Ji-wen
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TONG Xiao-dong
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TU Yong-ming.Experimental study on negative skin friction and mechanical behavior of high-speed railway CFG pile-raft composite foundation[J].Journal of Railway Science and Engineering,2009,6(4). |
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| Authors: | ZENG Jun-cheng ZHANG Ji-wen TONG Xiao-dong TU Yong-ming |
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| Institution: | ZENG Jun-cheng,ZHANG Ji-wen,TONG Xiao-dong,TU Yong-ming (School of Civil Engineering,Southeast University,Nanjing 210096,China) |
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| Abstract: | According to the result of CFG pile-raft composite foundation test on high-speed railway,the downdrag of the piles were increased by the friction between the soil and the piles because of the pile-soil differential settlement,and the negative skin friction was generated.The negative skin friction increases the deformation of piles and even leads to the destruction of piles.Through the in-situ test of CFG pile-raft composite foundation on Beijing-Shanghai high-speed railway project,the pile elastic modulus w... |
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| Keywords: | high-speed railway CFG pile-raft composite foundation negative skin friction |
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