| In recent years, with the development of foundation pit engineering, the plane shapes and forms of supporting system is becoming more and more complicated, the space effect is becoming more and more obvious. The conventional design method cannot meet the requirements of the foundation pit design now. Based on deeply analyzed the advantages and disadvantages of the elastic foundation beam method, this paper put forward the three-dimensional finite element analysis method considering structure-soil interaction.In this paper, based on a particular foundation excavation in Tianjin, the three- -dimensional finite element analysis considering structure-soil interaction is carried out with the help of ABAQUS. In the finite element model, Mohr-Coulomb is used to simulate the actual soil; contact face element is used to simulate the interaction between soil and structure, active and inactive element method is used to simulate the excavation process. According to the calculation results, the internal force and deformation of palisade structure and supporting system, the soil pressure distribution under different conditions is analyzed. Through the comparison of the calculated value and the measured value, the rationality and applicability of this model is verified. By changing the finite element model, the single factor analysis method is used to study the relation-ship between the pit foundation's deformation and internal force and the interaction of the soil and structure, soil modulus and the stiffness and depth in the soil of the palisade structure, and found some useful conclusions. Finally, this paper used elastic foundation beam method, which is the most commonly used in the design of foundation pit, to calculated the deformation and internal force of the retaining piles and supporting system. The causes of differences and applicability between the two analysis methods are analyzed. The method and conclusions are useful for other similar projects's design and construction.
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