南宁第三系泥岩深基坑开挖对紧邻地铁隧道影响  

Influence of deep excavation on adjacent subway tunnels in Nanning

作　　者：李结全 欧孝夺[2] LI Jie-quan;OU Xiao-duo(Guangxi Ruiyu Construction Technology Co.,Ltd,Nanning 530003,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西瑞宇建筑科技有限公司,南宁530003 [2]广西大学土木建筑工程学院,南宁530004

出　　处：《桂林理工大学学报》2019年第1期128-133,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51168004)

摘　　要：以南宁华丰城深基坑工程施工为基础,考虑土体弹塑性及土体与结构的相互作用,运用有限元软件Midas分析了深基坑开挖对邻近既有轨道交通1号线区间隧道的影响。计算结果表明,在基坑开挖阶段,隧道的位移以向上的竖向位移为主,向坑内的水平位移略小,开挖到基坑底时达到最大值,水平方向为7.96mm,竖直方向为8.69mm;回填阶段改变位移方向,回填完成时达到最大值,水平方向为4.61mm,竖直方向为9.70mm。南宁华丰城深基坑工程施工引起的隧道裂缝宽度均小于地铁隧道变形控制标准10.00mm的要求。Based on the Huafengcheng deep foundation pit in Nanning, the influence of deep excavation on adjacent tunnels of Metro Line NO.1 is analyzed by finite element method, in order to study the elastoplasticity of soil and the interaction between soil and tunnel. The results show that the displacement of the tunnel is mainly vertical upward, while the horizontal displacement is slightly smaller in the excavation stage. The displacement reaches maximum value when excavated to the bottom(horizonal direction is 7.96 mm,vertical direction is 8.69 mm). For the backfilling stage, the displacement direction is changed and the maximum value is reached after backfilling is completed horizontal direction is 4.61 mm,vertical direction is 9.70 mm. The tunnel crack caused by the construction of the deep foundation pit is within the requirement by the deformation control standard of Metro tunnel.

关 键 词：深基坑 地铁隧道 位移 裂缝 

分 类 号：TU45[建筑科学—岩土工程]