摘要
基坑开挖施工会对周边土体造成扰动,进而对既有地铁线路的安全运营产生不利影响。为此,以某地铁线路中间风井基坑开挖为例,通过对基坑开挖过程中基坑和临近既有地铁隧道的自动化监测数据以及有限元,分析了基坑开挖对邻近隧道变形的影响。结果表明,随着基坑开挖深度增大,隧道变形速率也随之加快;在砼支撑浇筑完成后,隧道收敛变形趋于平稳。围护结构变形主要呈现上下变形小,中间变形大的趋势。通过合理设置支撑系统和实时监测,可以有效控制基坑变形,确保邻近地铁隧道的安全性和稳定性。
Excavation of foundation pits can cause disturbance to the surrounding soil,which in turn adversely affects the safe operation of existing subway lines.Taking the excavation of a foundation pit at an intermediate air shaft of a subway line as an example,this paper analyzes the impact of foundation pit excavation on the deformation of adjacent tunnels through automated monitoring data of the foundation pit and nearby existing subway tunnels during the excavation process,as well as finite element analysis.The results show that as the excavation depth of the foundation pit increases,the tunnel deformation rate also accelerates,and after the completion of concrete support pouring,the tunnel convergence deformation tends to stabilize.The deformation of the retaining structure mainly exhibits a trend of small deformation at the top and bottom and large deformation in the middle.Through reasonable setting of support system and real-time monitoring,the deformation of foundation pit can be effectively controlled to ensure the safety and stability of adjacent subway tunnels.
作者
陈永武
CHEN Yongwu(Fuzhou Metro Construction Engineering Quality Safety Supervision Station,Fuzhou 350001)
出处
《福建建筑》
2024年第12期81-86,共6页
Fujian Architecture & Construction
关键词
基坑
中间风井
砼支撑
隧道变形
数值模拟
变形监测
Foundation pit
Intermediate air shaft
Concrete support
Tunnel deformation
Numerical simulation
Deformation monitoring
