Nonlinear Coupling Analysis on Working Behaviour of Pile Group

The numerical analysis of finite element coupling infinite element is recently used to simulate the effects of unbounded foundation of stresses and displacements. In this thesis, the finite element analysis is adopted to simulate the piles and the near soil; between the pile and the soil a joint element is designed to imitate the relative settlement while the infinite element is used to imitate the distant soil. elastic analysis way for concret elements and infinite elements are used, K-G model and E-U model for near soil.Calculation results show that using Goodman contact element to simulate the interaction of pile and soil has the advantage of flexibility;and the graphic formula of the calculation curves of nonlinear model and K-G model accords with that of the measure curve while the elastic calculation curve is far from the measure curve;the skin friction and pile-tip resistance pressure of the corner pile is the largest, the side pile less, and the center pile the least.The analysis of one example shows that the analytical model adopted in the thesis is reasonable, the results are both reasonable and accurate.