基坑开挖对既有下卧隧道的变形影响规律分析  

Influential Analysis of Deformation Patterns in Existing Underpass Tunnels Affected by Pit Excavation

作　　者：徐瑶瑶 XU Yaoyao(School of Civil Engineering,City University of Hefei,Hefei 230071,China)

机构地区：[1]合肥城市学院土木工程学院,安徽合肥230071

出　　处：《徐州工程学院学报(自然科学版)》2025年第1期65-71,共7页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：安徽省教育厅2022年科学研究重点项目(2022AH052467)。

摘　　要：为了研究在既有隧道上方进行基坑工程施工时引起的隧道和基坑的变形规律,以实际工程项目为研究背景,结合实际工程中基坑与隧道周边环境的监测数据,采用FLAC 3D对该基坑施工阶段进行数值模拟分析,通过对基坑的地表沉降、深部土体位移和隧道的拱顶沉降、最大弯矩进行研究,揭示基坑开挖对既有下卧隧道的变形规律.研究结果表明:在基坑开挖过程中,基坑各测点的测移变形值呈现“弓”字形,长边的测移值普遍大于短边;隧道拱顶和拱间处变形以沉降变形为主,拱腰处变形以隆起变形为主;当隧道与基坑的距离大于35 m时,对隧道拱顶位移值影响较小.研究成果可为类似工程项目提供借鉴与参考.To investigate the deformation patterns of tunnels and excavation pits during the construction of excavation projects above existing tunnels,this paper takes an actual engineering project as the research context.Combining monitoring data from the surrounding environment of the excavation pit and tunnel in the actual project,FLAC 3D is employed to conduct numerical simulation analysis of the excavation construction stage.Through comparative analysis and other methods,the surface settlement of the excavation pit,deep soil displacement,tunnel vault settlement,and maximum bending moment are studied and analyzed to reveal the deformation patterns of existing underpass tunnels affected by excavation.The research results indicate that during the excavation process,the lateral deformation values at various measurement points of the excavation pit exhibit a"bow"-shaped pattern,with the measurement values on the longer sides generally greater than those on the shorter sides.The deformation at the tunnel vault and between arches is mainly settlement,while the deformation at the arch waist is mainly upheaval.When the distance between the tunnel and the excavation pit is greater than 35 meters,the impact on the tunnel vault displacement value is relatively small.The research findings can provide a reference for similar engineering projects.

关 键 词：基坑工程 隧道工程 数值计算 现场监测 

分 类 号：TU93[建筑科学—结构工程]