文档介绍：离心模型实验的持续墙变形影响因素 pestel分析模型
作者简介：元翔，男，博士生，核心从事岩土工程方面的研究，tjyuanx@。摘要：以上海世博会世博轴及地下综合体工程1标段逆作法施工深大基坑为背景，为了更好的理解土体开挖对地 and width based on the topdown construction method in the deep and large foundation pit of Shanghai Expo axis underground complex project. Centrifuge model tests and monitoring data indicate that the results of numerical calculation are approximately close to the horizontal displacement of the underground diaphragm wall measured in site, which reflects the deformation behavior of excavation. The results show that remained berm and middle plate have good control over the deformation of underground diaphragm wall. Most part of underground diaphragm wall deformation caused by soil creep occurs after the remained berm is excavated. So in order to decrease the deformation of underground diaphragm wall, it would be useful to conduct plate structures as soon as the remained berm is excavated. The excavation width of remained berm in the north part is less than that in the south part. It will be advisable to finally excavate the remained berm where there are protected objects nearby.
Key words:excavation engineering；underground diaphragm wall；centrifuge model test；finite element calculation
基坑开挖过程是基坑开挖面上卸荷的过程，卸荷引起坑底土体产生以向上为主的位移，同步也引起围护构造在两侧压力差的作用下而产生水平位移。影响基坑围护构造变形的核心因素有：场地的水文地质和工程地质条件、基坑平面形状、基坑规模、周边环境条件、墙体刚度、施工措施、墙体嵌固深度、支撑形式及平面刚度和支撑预应力大小等［1］。部分学者如Peck［2］、Cl