| CFG桩复合地基承载力分析 |
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| 引用本文： | 贾剑青,王宏图,李晶,张宪,范晓刚.CFG桩复合地基承载力分析[J].重庆大学学报(自然科学版),2011,34(9):117-120. |
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| 作者姓名： | 贾剑青 王宏图 李晶 张宪 范晓刚 |
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| 作者单位： | 兰州交通大学 交通运输学院,甘肃 兰州 730070;重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆400044;);重庆大学 煤矿灾害动力学与控制国家重点实验室;复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044;;兰州交通大学 交通运输学院,甘肃 兰州 730070;兰州交通大学 交通运输学院,甘肃 兰州 730070;重庆大学 复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044 |
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| 基金项目： | 国家自然科学创新群体基金资助项目(50921063);甘肃省自然科学基金资助项目(1010RJZA063);重庆市国土房管局科技计划项目(2009-01); 兰州交通大学‘青蓝’人才工程基金资助计划资助(QL-08-16A);川煤集团科技项目(2009-08);高等学校博士学科点专项科研基金资助课题(406057) |
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| 摘 要： | 某客运专线某标段采用CFG桩加固技术。对CFG桩进行了低应变动测、单桩承载力试验、复合地基承载力试验及理论计算。结果表明：一类桩占93.9%,二类桩占6.1%;单桩承载力及复合地基承载力特征值均大于设计值。建立了三维有限元模型,模拟分析了CFG桩顶及桩间土应力随加载水平的变化关系以及CFG桩及桩间土应力分担比。模拟结果表明：1)随着荷载的增加,CFG桩顶应力及桩间土应力也随之增大,但CFG桩顶应力的增长速率大于桩间土;2)加载初期,CFG桩与桩间土应力分担比逐渐增大,且增长速度较快;随着荷载的增加,桩土应力分担逐渐趋于稳定。
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| 关 键 词： | CFG桩 复合地基 承载力 |
| 收稿时间： | 4/1/2011 12:00:00 AM |
Analysis of bearing capability of CFG pile composite foundation |
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| JIA Jian qing,WANG Hong tu,LI Jing,ZHANG Xian and FAN Xiao gang.Analysis of bearing capability of CFG pile composite foundation[J].Journal of Chongqing University(Natural Science Edition),2011,34(9):117-120. |
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| Authors: | JIA Jian qing WANG Hong tu LI Jing ZHANG Xian and FAN Xiao gang |
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| Institution: | School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R.China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University, Chongqing 400044, P.R.China;State Key Laboratory of Coal Mine Disaster Dynamics and Control;State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, P.R.China;School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R.China;School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R.China;State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam,Chongqing University, Chongqing 400044, P.R.China |
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| Abstract: | The CFG pile is used to consolidate the foundation in one passenger dedicated line. The field experiments including low strain dynamic testing, bearing capability of single pile and the composite foundation are done, and the bearing capability of composite foundation is calculated, too. The results show that the first and second class piles account for 93.9% and 6.1% respectively, and the bearing capability eigenvalues of single pile and composite foundation are larger than the designed values. The 3D FEM model is established to simulate the stresses of CFG pile top and inter-pile soil changing with load level, and the stress ratio between CFG pile and inter-pile soil is analyzed, too. The following results are got from the calculation results of FEM: 1) the stresses of CFG pile top and inter-pile soil increase with load level, but the increasing rate of the former is larger than the latter; 2) the stress ratio between CFG pile and inter-pile soil increases quickly when the load level is low, and it tends to convergent gradually with load increasing. |
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| Keywords: | CFG pile composite foundation bearing capability |
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