基坑开挖对邻近地铁隧道影响的分析  

Analysis of Influence of Deep Excavation on Adjacent Subway Tunnels

作　　者：赵园园 左人宇 张欣然 谢艺东 ZHAO Yuanyuan;ZUO Reyu;ZHANG Xinran;XIE Yidong(Shenzhen Gongkan Geotechnical Engineering Co.Ltd.,Shenzhen 518054)

机构地区：[1]深圳市工勘岩土集团有限公司,广东深圳518054

出　　处：《土工基础》2024年第6期1033-1038,共6页Soil Engineering and Foundation

摘　　要：随着高层建筑和地下空间利用的发展,我国深基坑工程日益增多,基坑开挖工程施工对周围环境的影响很大。以紧邻地铁二号线隧道的天音大厦基坑项目为分析对象,采用有限元软件midas建立隧道——土体基坑围护结构共同作用的三维非线性数值计算模型,分析基坑开挖全过程中的基坑支护结构及地铁隧道的变形情况。计算结果表明,基坑开挖改变了邻近地铁隧道的变形场。随着基坑开挖深度的增加,隧道侧向位移变化不大,竖向位移变化稍明显。基坑支护结构、地铁隧道均满足规范中变形控制要求,证明采用的咬合桩+内支撑支护形式能够对周围环境的变形起到有效的控制作用。In recent years,with the development of high-rise buildings and the underground space utilization,the number of deep excavation projects in China is increasing,especially in the large cities,where the subway network is dense,the construction of foundation excavation has a great impact on the surrounding environment.Reasonable measures shall be taken to protect adjacent structures and utilities from damage.This paper presents a case history of a deep excavation project of Tianyin Mansion,which is close to the Subway Line No.2 tunnel.A three-dimensional nonlinear numerical analysis model of the interaction between the tunnel soil mass and the deep excavation support structure is established by using the finite element software MIDAS GTS NX.The deformation of the deep excavation support structure and subway tunnel in the entire process of deep excavation are analyzed.The analysis results show that the deep excavation changes the deformation field of the adjacent subway tunnels.With the increase of the excavation depth,the lateral displacement of the tunnel changes little,and the vertical displacement changes slightly.The deformation of the deep excavation support structure and the subway tunnel meet the deformation control requirements in the specifications,which proves that the interlocking pile+internal support adopted in the project can effectively control the deformation of the surrounding environment.At the same time,it also proves that the modified Mohr Coulomb model can be used to simulate the deformation of the subway tunnel caused by the excavation in complex environment.

关 键 词：基坑开挖 地铁隧道 数值模拟 变形 监测 

分 类 号：TU473[建筑科学—结构工程]