基于FLAC3D的基坑开挖与支护三维数值分析  

Three-Dimensional Numerical Analysis of Braced Excavation Based on FLAC3D

作　　者：丁勇春[1] 王建华[1] 徐斌[1,2] 

机构地区：[1]上海交通大学土木工程系,上海200030 [2]南昌工程学院土木工程系,南昌330029

出　　处：《上海交通大学学报》2009年第6期976-980,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50679041);上海市科学技术委员会资助项目(08201200903);江西省教育厅科学技术研究资助项目(GJJ09367)

摘　　要：采用三维快速拉格朗日方法(FLAC3D)建立了考虑基坑分步开挖与支护全过程的三维动态计算模型,土体采用修正剑桥模型模拟,考虑了支护结构与土体的接触滑移作用,分析了基坑施工中围护墙变形、地表沉降、坑底隆起、坑外深层土体变形的基本特性.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.分析结果可为类似基坑工程的设计和施工提供有益参考.Fast Lagrangian Analysis of Continua in 3 Dimensions （FLAC3D） was employed to investigate the deformation characteristics of a staged excavated and supported foundation pit. Modified Cam-clay model was adopted to model the soil behavior and the interaction between soils and retaining structures was also taken into account in the numerical model. 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 is proved. The numerical results provide a useful reference for the design and construction of similar deep excavation projects.

关 键 词：基坑开挖 数值分析 三维快速拉格朗日方法 修正剑桥模型 土与结构相互作用 

分 类 号：TU473.2[建筑科学—结构工程]