桩-土间相互作用机理的研究是保证桩基础在建筑荷载作用下安全稳定的关键。在分析桩-土间相互作用的基础上,利用有限元分析软件ANSYS中的Structural模块先进的非线性功能,进行桩的有限元分析,对桩-土间相互作用方式进行了数值模拟研究。建立了完整的桩模型,并建立弹簧单元以及表面效应单元以模拟土层对桩的作用力,得到了在建筑荷载和土层作用力下桩的位移量及其轴向应力分布,为建筑基础设计提供理论依据。 The study of pile-soil interaction mechanism is the key to ensure the safety and stability of pile foundation under the action of building load. Based on the analysis of pile-soil interaction, finite element analysis of piles is conducted by using the advanced nonlinear function of structural module in finite element analysis software ANSYS, and the pile-soil interaction mode is numerically simulated. A complete pile model is established and the spring unit and the surface effect unit are established to simulate the action of the soil on the pile. The pile displacement and its axial stress distribution under the construction load and soil layer action are obtained. Design provides a theoretical basis.