雷国光，孙永超，李明

（吉林建筑大学土木工程学院, 长春 130118）

［摘要］采用FLAC3D有限差分法分析软件建立了考虑基坑开挖与支护全过程及土体与支护结构接触特性的三维动态计算模型，模拟了地铁车站深基坑的开挖和支护全过程，分析了基坑施工中围护墙变形、地表沉降、坑底隆起、坑外土体内部变形的基本特性，计算得到的地表沉降曲线与已有文献的经验沉降曲线基本一致，验证了计算结果的适用性。此外，分析结果可为类似基坑工程的设计和施工提供有益参考。

［关键词］FLAC3D； 基坑开挖与支护； 接触特性； 变形分析

中图分类号： TU473.2 文献标识码： A文章编号： 1002-848X(2015)S2-0121-04

*吉林省国土资源厅软科学研究项目（201304）。

作者简介：雷国光，教授，Email:496635680@qq.com。 

Three-dimensional numerical analysis of the deformation law of deep foundation pit of

 subway station based on FLAC3D

Lei Guoguang, Sun Yongchao, Li Ming

(School of Civil Engineering, Jilin Jianzhu University， Changchun 130118， China)

Abstract: Three-dimensional dynamic calculation model which considering the braced excavation and the contact characteristics that between soil and the supporting structure was established, and the excavation and supporting process of deep foundation pit in subway station by FLAC3D software was simulated. The deflection of retaining walls, the settlement of ground surface, the heave of excavation bottom, and the movement of the deep strata outside the excavation were analyzed. The ground surface settlement curves of the numerical model are basically consistent with the empirical ones from the existing literatures, so its feasibility was proved. The numerical results provide a useful reference for the design and construction of similar deep excavation projects.

Keywords: FLAC3D; excavation and supporting of foundation pit; contact characteristic; deformation analysis