假定桩周围的土体为半空间无限体 ,桩由一系列受压单元组成 ,在桩土之间有一层无限薄的非线性接触面 ,传递桩土之间的剪力。认为接触面的剪力和剪切位移之间的关系是非线性的。此外 ,还考虑了桩底土反力的非线性 ,认为桩底反力与位移之间的关系亦为非线性。根据体系中结点力的平衡条件 ,建立了求解方程 ,并给出了两个算例 ,表明了本分析算法的适用性 Assuming that the soil around the pile is an infinite body in half space, the pile is composed of a series of compression elements. There is an infinitely thin nonlinear contact surface between the pile and soil, which transfers the shear force between pile and soil. It is considered that the relationship between shear and shear displacement of the contact surface is nonlinear. In addition, the non-linearity of the soil reaction force at the bottom of the pile is also considered, and the relationship between the reaction force at the bottom and the displacement is also nonlinear. According to the equilibrium conditions of the knot forces in the system, the solving equations are established, and two examples are given to show the applicability of the analytical algorithm