Analysis of bearing capability of CFG pile composite foundation |
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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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