Based On 3D Numerical Analysis Of The Sheet Pile Wall Supporting Model And Deformation Predicting For Deep Foundation Pit

This paper takes the sheet pile wall supporting for deep foundation pit which distributed in the sandy soil as the cutting spot, take a deep foundation pit which located at Nanchang Yangzi continent as the prototype. Then, by the similar model test and numerical analysis, the deformation mechanism of deep foundation pit under without supporting, with the sheet pile wall supporting and different lateral bracing are discussed; and combining with the grey theory to analysis of influence factors and to forcast of the deformation when deep foundation excavating . The main content includes:Firstly, the deformation characteristic is summarized, and different influence factors for deep foundation pit are induced and analyzed.Secondly, designed and manufactured the similar test model, then the deformation mechanism and destruction characteristic of deep foundation pit distributed in the sandy soil under different supporting on are discussed.Thirdiy, by FLAC^3D numerical simulated, micro analysis of the deformation mechanism and stress characteristic; and combining with the traditional theory computation method carried on the contrast to the deep foundation excavated subsidence quantity computation, the analysis method suitable for sandy soil is chosen.Fourthly, on the basis of typical deep foundation pit engineering, according to the grey relational analysis, the construction parameters had been carried on the hierarchical analysis, and arranged the influence order of five comparison parameters to the sheet pile wall's maximum horizontal displacement.Finally, applying the gray forecast model GM(1,1) carried on the fitting and the forecast the displacement path of observation points and attempted to forecast the time when the distortion achieved the marginal value.