Influence Analysis of the Character Parameters of the Pile and Soils' Interfaces to the Displacement of Foundation Pit

Using a finite element numerical software,PLAXIS,combined a pit of office building in Wuhan,to simulate the process of staged construction to excavation.The results and the local survey values are very identical,which prove that the calculated method is reliable.On this basis,to discuss and analyze the influence rules of the pile-soil interfaces' strength reduction factor and the virtual thickness factor to the horizontal displacement of retaining structure, the earth surface settlement and the pit-bottom rebound deformation.The research shows: with the increasing of the strength reduction factor,the deformation will all be decreasing gradually;while with the increasing of the interface virtual thickness factor,the deformation will all be increasing gradually.By comparison,the influence to the displacement of retaining structure is the most obvious,the influence to the deformation of pit bottom is the least,and the influence of the strength reduction factor to the displacement of deep foundation pit are more obvious than the influence of the interface thickness factor.