基于FLAC3D的砂质淤泥质土层地铁施工影响因素分析OA北大核心CSTPCD

In order to analyze the influencing factors of existing tunnel deformation in overlapping subway construction,based on the S1-TS-05 section of Suzhou Metro Line S1 project,numerical simulation methods were used to analyze the influence of tunnel geometric parameters,spatial position,and geological parameters on the settlement and deformation of existing tunnels caused by shield tunneling in sandy and muddy soil layers.The accuracy of numerical calculations was verified through on-site monitoring.The research results indicate that in the construction of shield tunneling on sandy and muddy soil layers,the displacement and deformation of existing tunnels are mainly vertical settlement,and the settlement amount increases with the increase of shield tunnel diameter,but decreases with the increase of cover layer thickness,net distance between new and old tunnels,underpass angle,and elastic modulus of the formation.The on-site monitoring data is in good agreement with the simulation results,and there is a negative correlation between the displacement of the existing tunnel and the distance from the overlapping center.The research conclusion provides a reference for deformation control during shield tunneling of overlapping subway tunnels under the same type of geological conditions.