某深基坑工程监测与变形影响因素有限元分析  

Monitoring and finite element analysis of influence factors on deformation of deep foundation pit

作　　者：刘熙媛[1,2] 陈中婧 付士峰 黄琪[1] 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北建设勘察研究院有限公司,河北石家庄050031 [3]河北省建筑科学研究院,河北石家庄050021

出　　处：《辽宁工程技术大学学报（自然科学版）》2016年第8期852-858,共7页Journal of Liaoning Technical University (Natural Science)

基　　金：河北省建设科学技术研究计划项目(2012-156)

摘　　要：针对深基坑工程变形对周围环境稳定性影响的问题,结合某深基坑工程变形监测数据,运用Midas/GTS建立基坑支护结构三维有限元模型.采用单因素分析法,研究土体弹性模量、围护桩入土深度及刚度对基坑变形的影响.结果表明:带一道内支撑的基坑围护桩墙水平侧移值在围护桩底部最大,基坑外地表沉降是典型抛物线形式;围护桩水平侧移主要受基坑底部土体模量影响;围护桩入土深度对坑底土体隆起影响显著;当入土深度及刚度处于合适比例时才能发挥各自的最大作用.The effect on the stability of deep foundation pit engineering for the surrounding environment cannot be overlooked. Combined with deformation monitoring data of deep foundation pit engineering, three-dimensional finite element model of supporting structure of foundation pit is established by applying Midas/GTS. The influence of elastic modulus of soil, embedment depth and rigidity of retaining piles for the deformation of foundation pit is studied using single factor analysis. The analysis results show that the horizontal displacement value of supporting structure with one inner support is the largest at the bottom of the retaining piles. It is a representative parabola layout form for the surface settlement of soil outside the pit. The horizontal displacement value of supporting structure is influenced mainly by the soil modulus of the bottom of foundation pit. The embedment depth of retaining piles has obvious effects on the soil uplift of the pit bottom. When the embedment depth and stiffness of retaining piles are in appropriate proportions, they could play the effective role respectively.

关 键 词：深基坑 有限元 支护结构 变形 弹性模量 入土深度 刚度 

分 类 号：TU47[建筑科学—结构工程]