采用分层地基系数的多支撑支护结构分析

Analysis of Multi-braced Retaining Structure for Layered Soil Based upon Soil Coefficient Method

以土层分层、支撑位置及抗弯刚度变化处等为结点对围护墙体进行单元划分，按地基系数法考虑开挖面下被动土体横向抗力．基于单元挠曲微分方程的初参数解．通过传递矩阵分析方法，结合围护墙两端及支撑轴力的边界条件．推导得多支撑支护结构各开挖工况下围护墙各结点的内力、变形及支撑轴力。编制了计算程序，并以上海太平洋广场一期工程基坑开挖为例进行分析计算。该法可用于求解上层分层、围护墙刚度随深度变化等情况．能更好地符合工程实际问题。

In this paper, the retaining wall is divided into finite elements according to the layers of soil,rigidity change of retaining wall, elevations of bracing and so on. Based on the transverse soil coefficientmethod of the back force in positive area and the method of transferring matrix, internal force, deformationof nodes and axial force of bracing can be obtained.This method can deal with layered soil in positive area by using different values of 'm' and changingrigidity of retaining wall. The program is written, and excavation of deep foundation pits of Phase 1 ofShanghai Pacific Ocean Square is analysed by this method.