层状地基中桩筏基础的计算机数值模拟

本文选用层状弹性半空间地基模型,将桩和筏板作为整体,进行有限元分析。运用边界元方法建立层状地基的刚度矩阵,通过FEM-BEM耦合,建立了桩筏基础的筏板、桩和层状地基土共同作用的基本方程。编制成计算机程序,可有效地模拟在竖向荷载、横向荷载和弯矩作用下桩筏基础和地基的应力、应变的状态变化。实例计算结果表明文中所提出方法的精确性和有效性,同时说明在工程实际中考虑三者共同作用的可行性与必要性。

Computer Numerical Simulation of Pile - Raft Foundation in Layered Soil

A layered elastic model is adopted in this paper for the analysis of semi-space soil. The piles and raft in its entirety is analyzed by the finite element method. The stiffness matrix of layered soil is founded by the boundary element method. By FEM-BEM coupling, the basic equation is made for raft-pile -layered soil interaction. By the composed computer program, it can effec-tively simulated stress and stain behavior of pile -raft foundation and soil under bending moment, axial and lateral loading. The re-sults from calculation indicate the accuracy and validity of method presented, and illustrate the feasibility and necessity of considering their interaction in engineering practice.