深基坑开挖对周边地下管线的影响

Impacts of Deep Foundation Pit Excavation on Surrounding Underground Pipelines

为探究深基坑开挖过程对周边既有地下管线造成的影响,基于有限元软件MIDAS GTS NX,分别从管线埋距、管线埋深、管线材质3个方面进行了数值模拟分析。结果发现:在靠近基坑开挖面中部位置处的管线位移最大;管线埋距的增加会减少管线在水平和竖直方向上的位移量;不同埋深下管线水平位移波动幅度为27.8%,竖向位移波动幅度为12%;弹性模量越大的管线其在管-土协同变形过程中发生的位移量越小,抵抗变形的能力越强。

Based on the finite element software MIDAS GTS NX,the numerical simulation analysis was carried out on the pipeline buried distance,pipeline buried depth,and pipeline material change in order to explore the impact of the deep foundation pit excavation process on the existing underground pipelines.The results showed that the pipeline displacement was the largest near the middle of the excavation surface of the foundation pit;the increase in the buried distance of the pipeline would reduce the displacement of the pipeline in the horizontal and vertical directions;the fluctuation range of horizontal displacement of pipelines under different buried depths was 27.8%,and the range of vertical displacement fluctuations was 12%;the greater the elastic modulus of the pipeline,the smaller the displacement during the pipe-soil collaborative deformation process,and the stronger the ability to resist deformation.