Influential Analysis of Deformation Patterns in Existing Underpass Tunnels Affected by Pit Excavation
XU Yaoyao
Abstract：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,FLAC3D 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.
Keywords：excavation engineeringtunnel engineeringnumerical calculationfield monitoring
Publication Date：2025-03-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 65-71 )