中文摘要：

在分析常用计算方法优缺点的基础上，通过引入非线性的桩土相互作用模型，提出了一种可考虑桩土相互作用的悬臂式排桩内力计算方法。首先，采用杆单元对桩体结构进行离散化，计算单元刚度矩阵并合成为总体刚度矩阵；其次，假定基坑内、外侧土压力与桩身位移之间的非线性函数关系，建立非线性的节点荷载函数列阵；再次，根据总体刚度矩阵和节点荷载函数列阵形成总体刚度方程（组），采用 Newton-Raphson 法求解以得到节点位移列阵；最后，通过单元刚度方程和节点位移列阵反求桩身内力和桩侧土压力。算例分析表明，本文方法计算简单方便，能充分反映桩侧土压力非线性变化的特点，较好地揭示了桩土相互作用机理，适用于悬臂式排桩内力计算。

英文摘要：

By analyzing the advantages and disadvantages of commonly used calculation methods and introducing a nonlinear pile-soil interaction model,a method for calculating the internal forces of cantilever piles was proposed, which can consider the pile-soil interaction.Firstly,finite bar elements were used to discretize the pile structures,and then,elemental stiffness matrixes were calculated and incorporated into global stiffness matrix.Secondly,the nonlin-ear function relationship between earth pressure and pile displacement in or out of the foundation pit was assumed,and then the nonlinear function array of j oint loads was established.Thirdly,the overall stiffness equation was formed ac-cording to the global stiffness matrix and nodal load function array,and was solved to obtain the nodal displacement array by using the Newton-Raphson method.Finally,the internal forces of pile and lateral earth pressure were calcu-lated with the elemental stiffness equations and nodal displacement array.The example analysis shows that the pro-posed method is simple and convenient,fully reflecting the characteristics of nonlinear variation of earth pressure act-ing on piles,and revealing the mechanism of pile-soil interaction well.Therefore,it is suitable for the internal force calculation of cantilever piles.