Study On 3-D Finite Element Simulation For Deep Foundation Pit Engineering

According to the problem of deep supporting structure In the first part of this paper, the current calculation theory in common use of deep foundation pit engineering are introduced, and the main calculation theory and FEM theories are studied, and the characteristic of each theory are analysised, FEM has become a practical and effective means in analyzing geotechnique problems. In this paper, I use three-dimensional to analysis the foundation, study the internal force and distortion rule of supporting structure. The main research contains:(1)Through the analysis of deep foundation property ,study the pile and bolt supporting structure design theory and method ,set up the model of soil, considering the property and structure relation of the soil ,meanwhile consider the stress property of the bolt.(2)The most foundation use 2d analysis the foundation, not consider the space effect of soil pile and bolt .I use 3d to analysis the process ,also think the seepage ,accuracy simulate the thruth .The choice of soil body model ,in this article the soil body uses the expansion the Druker-Prager model, soil body unit uses CPE8R,pile and anchor unit uses B22;(3)besides consider the seepage .we also consider the waterproof curtain and step-slope .make the stress and the displacement of the soil pile and the bolt to change.(4)A supporting engineering in Handan is studied in this paper. Made a simulation analysis with ABAQUS. Study the internal force and distortion rule of supporting structure. The calculate results of "m" method and FEM are compared; The finite element displacement result draws close to the actual result. The finite element method may apply to the deep hole excavated for building foundation supporting project, Instruction engineering design and construction.