Deformation analysis of deep foundation pit across the existing subway station
LIU Meilin
HOU Yanjuan
ZHANG Dingli
FANG Qian
Abstract：Based on the research data collected at Xiawafang station,which is a cross-transfer sub-way station of Tianjin subway line 5 and line 1,the horizontal displacement of foundation pit sup-port structure,the surface settlement behind the retaining wall,and the deformation of existing station caused by deep foundation pit crossing the existing subway station are analyzed.The re-sults show that the maximum horizontal displacement of support wall is 0.064％ H (in which H is the excavation depth),where is about 0.63H under the ground surface.The maximum ground surface settlement behind the retaining wall is 0.025％ H ,where is about 0.71H away from the wall.The influence zone extends to about 2H from the wall.The ratio between the maximum ground surface settlement and the maximum wall deflection is among 0.38 to 1.04,and its average value is about 0.77.The vertical deformation of the existing station which crosses the foundation pit is mostly uplifted.The horizontal displacement protrudes outside the railway sta-tion.The deformation of the existing station is mainly horizontal.By reinforcing the existing sta-tion with waterproofing sealing and reinforcing its soft soil layer behind the retaining wall,the existing structural deformation can be significantly reduced.
Keywords：excavation of foundation pitexisting stationground surface settlementdeformation law
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 122-129 )