The Numerical Analysis Of Elevated Pipe Pile Foundation Subjected To Lateral Loads

Till now there is no sufficient answer to the working mechanisms of the pile group foundation under horizontal loads for its complicacy. In this paper, the main research object is high cap pipe pile foundation, and large nonlinear finite element software ABAQUS was used to do the research, in which the horizontal bearing capacity, group pile effect and the nonuniformity load of the pile group were analyzed to support the basis of the engineering design.First, the FEM analysis of the high cap single pile foundation was done by software ABAQUS: the influence of different parameters (pile length, pile diameter, pile modular, parameters of soil, friction coefficient between soil and pile) on the bearing capacity of single pile under horizontal loads was researched, and the conclusion was that dilatancy angle had the most impact on bearing capacity and the critical length of pile was about 20D (D meant diameter), the critical length of soil was about 10D. Furthermore, some solutions to improve the horizontal bearing capacity of the pile foundation were proposed.Then, on the basis of single pile foundation, the FEM analysis of high cap group pile foundation was also done. The internal force changes between soil and pile of the group foundation under horizontal loads were analyzed, and the increasing range of the bearing capacity of group pike to single pile was achieved. The influence of pile distance, pile number, pile length and soil modular on the pile group was also analyzed, and the conclusion was that pile distance and number has the most impact on the pile group effect and the critical length of group pile was 20D~30D.Finally, quantitative analysis on unevenness of the load on each pile in different group pile foundations was done, including load sharing ratio and its changes to support the basis of the engineering design.