Piles are widely used in civil engineering, there exist many analysis method to study the stress and displacement of pile and soil, but due to the complicated interaction between them, the insitu test and analytical analysis show some limitation. So it is necessary to find some other methods to solve this problem. Due to the rapid advances in computer technology and sustained development, numerical modeling and simulation shows powerful tools. In order to numerical simulate the pile soil interaction to study the mechanical deformation characteristic of soil and pile, the numerical software FLAC3D is used to simulate the procedure of pile being loaded in the soil. After calculation, the mechanical characteristic of pile, response of soil are analyzed, the corresponding skin friction stress and axial stress distribution of pile are obtained, as well as the vertical displacement of soil, whose result can give some guidance for the further study.

Piles are widely used in civil engineering, due to the complicated interaction between piles and soil, the insitu test and analytical analysis show some limitations. So it is necessary to find some other methods to study the interaction of piles. The software FLAC3D is used to build the numerical calculation model for the pile soil model, the purpose of the simulation is to compare the different response of soil and pile when the types of pile contain the normal pile and expanded bottom pile. During the simulation, the load at the top of pile are the same for both the normal pile and expanded bottom pile, to analyze the different response of soil and pile with different head loads, showing that, the expanded bottom pile has more advantages over the normal pile, for it need smaller amount of engineering cost.

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Piles are widely used in foundation engineering. Much work has been done in the area of dragload on piles subjected to surcharge or consolidation of surrounding soils; much less work has been done on pile behavior under the horizontal pile head load. The writers believe that the effects of horizontal pile head load on dragload changes remain ambiguous among engineers. To obtain detailed information on the behavior, it is necessary to simulate the 3D geometry and nonlinear behavior of the soil. So in the present paper, the behavior of pile subjected to horizontal pile head load is analyzed by the three-dimensional (3D) interaction between the soil and the piles, whose result reveals the mechanism of pile with soil under the load of gravitation and load transferring mode along pile shaft for different horizontal pile head loads.