软土地区深基坑开挖及降水变形性状分析  

Analysis of deformation of excavation and precipitation of deep foundation pit in soft soil area

作　　者：孙程鹏 鞠海燕[1] 罗昌泰[1] 扶名福[1] SUN Chengpeng;JU Haiyan;LUO Changtai;FU Mingfu(Jiangxi Provincial Engineering Research Center of Special Reinforcement and Safety Monitoring Technology in Hydraulic ＆ Civil Engineering,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院江西省水利土木特种加固与安全监控工程研究中心,江西南昌330099

出　　处：《南昌工程学院学报》2018年第3期41-45,共5页Journal of Nanchang Institute of Technology

基　　金：江西省研究生创新专项基金项目(YC2017-S432);江西省科技厅项目(S2016SFYBG0137);江西省教育厅科技落地计划项目(KJLD12048);赣鄱英才555工程

摘　　要：针对南昌某软土深基坑工程,运用Midas GTS和修正Mohr-Coulomb模型建立三维有限元分析模型,基于有效应力分析法对深基坑开挖及降水施工过程引起的变形性状进行分析,结果表明基坑开挖具有明显的空间效应,围护结构水平位移及坑底隆起量过大是造成坑外土体沉降的主要原因,降水会使坑外土体沉降量及沉降范围明显增大;坑底抗拔桩能够有效控制坑底隆起量,减小坑外土体不均匀沉降对周围建筑物造成的危害。分析结论可为类似的基坑工程提供施工指导。Based on Nanchang soft soil deep foundation pit project,the Midas GTS and the modified Mohr-Coulomb model were used to establish 3 D finite element analysis model. Based on the effective stress analysis method,the deformation behavior of deep foundation pit excavation and precipitation construction is analyzed. It shows that the excavation has obvious spatial effect; that horizontal displacement of retaining structures and uplift of the pit are the main cause of the pit soil subsidence; and that the precipitation will increase the settlement amount and settlement range of the pit soil. The pile foundation can effectively control the uplift of the pit and reduce the damage to the surrounding buildings caused by the uneven settlement of the soil outside the pit. The conclusion can provide construction guidance for similar foundation pit project.

关 键 词：软土地区 深基坑 修正Mohr-Coulomb模型 降水 变形性状 

分 类 号：TU431[建筑科学—岩土工程]