以广义位移法数值模型为基础 ,给出了桩 土相互作用数值分析有限元程序中大直径桩体结构单元的内力分析算法。对典型工况下大直径单桩的内力数值分析表明 ,大直径桩体结构的几何尺寸以及梁柱结构特性对桩 土相互作用的力学机制影响很大 ,是桩基设计计算中不可忽视的重要因素 Based on the numerical model of generalized displacement method, an internal force analysis algorithm for the structural elements of large diameter pile in finite element program of pile-soil interaction numerical analysis is given. The numerical analysis of the internal forces of a large diameter single pile under typical working conditions shows that the geometrical dimensions of the large diameter pile structure and the structural characteristics of the beam and column have a great influence on the mechanical mechanism of pile-soil interaction and are important in the calculation of pile foundation design factor