Influence of Diaphragm Wall Size on Lateral Displacement and Surface Settlement of Foundation Pit of Soft Soil High-speed Railway in Tianjin
A foundation pit excavation project of the Jin-Wei high-speed railway in soft soil of Tianjin is taken as an example.A numerical calculation model is established by PLAXIS 2D software.Combined with the field monitoring scheme,the actual data was comparative studied.The impact of various depths and thicknesses of the underground diaphragm wall on its lateral displacement and the surface settlement amount was analyzed.The results indicate that the numerical simulations and field monitoring are highly compatible,which verified the reliability of the numerical model.Further analysis reveals that the thickness of the underground diaphragm wall is a crucial factor in controlling deformation,the increased thickness significantly reduces lateral displacement and settlement.Both numerical sim-ulations and measured data show that the maximum horizontal displacement of the wall occurs within a depth range of approximately 15～25 m,the most significant surface settlement occurring at a distance of approximately 10 m from the wall,and forms a typical"tick-mark"settlement curves.Based on these findings,recommendations are made to optimize the depth and thickness of the diaphragm wall in order to more effectively control deformation in deep exca-vations for high-speed railways in soft soil regions.
foundation pitsupporting structurelateral displacementsurface settlementPLAXISconstruction monitoring
国家科技期刊平台
NSTL
万方数据
