| With the reform and opening-up deeper and deeper and the fast development of Chinese economic, high-rise buildings and large span bridges increase fast. As one of the old and effective methods treating poor foundation, pile foundation is widely used. The super-long piles become universal in soft soil regions. The characteristic of the pile and the interaction between the pile and soil are very complex, so the investigation of theory is very important. Hereby the following items are studied:Firstly, the theory of piles and engineering practice at present are outlined. It illustrates the importance and practical engineering meaning of the theory study in super-long pile load convey mechanism.Secondly, several soil constitute models which are used broadly are summarized. Weighing their advantages and disadvantages, suitable constitute model is chosen.Thirdly, experimental data are quoted and evaluated to direct the building of the finite element model. Then contrast the finite element results with the experiment results.Then, the planar axial symmetry finite element model is built and linear elastic material is used for the pile concrete. D-P model is used for soil constitute model to simulate the side resistance, load-displacement relations of the top pile and axial stress distribution. The factors such as modulus ratio between pile and soil, the length of pile and diameter of pile are analyzed. Then the variant regulation is given.At last, the contrast results between finite element model and experiment are given. It indicates that the results of finite element is generally right and can be used in practice engineering.The innovation of this paper is the founding of planar axial symmetry finite element model of super-long pile. According to this, the regulations of side resistance, load-displacement of top pile and axial stress are analyzed. The regulation is close to the experiment results and can be used as theory reference for the practical engineering. |
PDF Full Text Request