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《Chinese Journal of Underground Space and Engineering》 2016-03
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Research on the Failure Characteristics of Pile Foundation by the Laboratory Experiment and Numerical Calculation

Liu Xiangpei;Dong Tianwen;Zheng Yingren;Department of Civil Engineering,Logistical Engineering University;Chongqing Key Laboratory of Geotechnical and Geological Engineering Protection;Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment;  
The bearing characteristics and damage conditions of pile foundation are the base for the establishment of failure mode and the determination of ultimate load.For research on damage characteristics of pile foundation,the external force and displacement of pile head,the friction resistance of pile side and the counter force of pile bottom are determined with the self-designed laboratory experiment on pile foundation bearing capacity. Numerical limit method is carried on to simulate it,the failure point at the steep drop can be seen in the P-s curve in both the test and numerical method if the load is decreased when pile foundation is close to failure.The results of ultimate bearing capacity and counter force from the test and numerical simulation are in good agreement,which show the tests are reliable and the numerical limit methods are feasible. According to the two methods above,three failure characteristics of the pile foundation was gained: 1. during foundation destruction,the displacement of pile top presented mutation,sometimes rebounding occurred after destruction; 2. it would appear mutation of counter force and significant rebound on the pile base; 3. the friction resistance of pile side would increase after decrease on its damage. These characteristics indicate that the bearing capacity of the pile side and the pile bottom can be enhanced after the failure of pile foundation,the balance of the pile foundation is still maintained,and the difference between pile foundations and other foundations is revealed. Comprehensive consideration of the failure characteristics of pile foundation,the conditions for controlling the bearing capacity of the pile foundation are proposed based on the first pile top displacement.
【Fund】: 国家自然科学基金(No.51178457)
【CateGory Index】: TU473.1
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