Numerical simulation and analysis of mechanical characteristics for large-diameter rock-socketed piles
XING Hao-feng1, 2, LI Hao-ming1, 2, AN Xin1, 2, LI Chun-feng3
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guizhou Transportation Planning Survey and Design Academy Co., Ltd., Guiyang 550001, China
Abstract：The main pier of in Hezhang Bridge Guizhou province has a height of 195 m, which is supported by 20 rock-socketed piles with 2.5 m in diameter and 40 m in length. The engineering geological condition of the main pier site is very complex. In order to investigate its mechanical characteristics, end bearing and shaft resistance distribution, 3D finite element analyses for individual pile and pile group are carried out. Some valuable conclusions are drawn: the overlaying stratum shares a certain proportion of the upper load, so it is uneconomical to neglect its influence in design; the shaft resistance and tip resistance are not mobilized synchronously, the shaft resistance is mobilized prior to the tip resistance; the reasonable depth of rock-socketed piles can improve the shaft resistance and enhance the load sharing ratio of the tip resistance and the shaft resistance of the overlaying stratum.
邢皓枫, 李浩铭, 安新, 李春峰. 超大直径嵌岩桩受力特性的数值模拟及其规律性分析[J]. 岩土工程学报, 2013, 35(zk2): 1126-1129.
XING Hao-feng, LI Hao-ming, AN Xin, LI Chun-feng. Numerical simulation and analysis of mechanical characteristics for large-diameter rock-socketed piles. Chinese J. Geot. Eng., 2013, 35(zk2): 1126-1129.
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