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| MACROSCOPIC AND MESOSCOPIC WORKING PERFORMANCE OF PCC PILE SUBJECTED TO VERTICAL LOAD |
| CHEN Yadong1，2，WANG Xudong3，SHE Yuexin1，CAI Jiangdong1 |
(1. Faculty of Architecture and Civil Engineering，Huaiyin Institute of Technology，Huaian，Jiangsu 223001，China；
2. Jiangsu Research Institute of Building Science Co. Ltd，Nanjing，Jiangsu 210028，China；3. College of Transportation Science and Engineering，Nanjing University of Technology，Nanjing，Jiangsu 210009，China) |
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Abstract The visual model test and distinct element method are employed to study the pile-soil force transmission characteristics，soil progressive deformation around pile，and failure behavior of cast-in-place concrete pipe pile(PCC pile). The study results show that the load-settlement curve of PCC pile varies gradually，outside shaft resistance is higher than inside，inside shaft resistance development lags behind outside. Outside shaft resistance plays more fully on upper part of pile，inside shaft resistance plays more fully on lower part of pile，inside shaft resistance and tip resistance controls later bearing capacity of PCC pile. Soil outside the pile presents inclined downward shear deformation，influence scope is cylindrical with a radius of 2D. Soil inside pile is given with the vertical deformation，and kept the step with pile at the beginning of loading，the inside relative displacement of pile and soil at the bottom of pile is bigger than upper soil during the later stage of loading. Pile tip soil can be divided into conical vertical compression area and lateral deformation area，and the influence depth is 4D，deformation pattern presents fan-shaped in the plane. The distribution of pile contact force chain brings into correspondence with shaft resistance distribution characteristics along pile length，soil porosity changes under pile tip reveal the shaft resistance plays before tip resistance from mesoscopic angle. Research results are important for further understand the interaction between PCC pile and soil.
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2015, Vol. 34 
