Analysis of ground surface deformation and retaining wall deflection characteristics under excavation of deep foundation pit of station in Tianjin subway line 6
XU Shusheng
HOU Yanjuan
LIU Meilin
Abstract：Based on the deep foundation pit project of Jinzhong Street Station in Tianjin Subway Line 6,numerical simulation is carried out by adopting FLAC3D to analyze the complete process of excavation and support of foundation pit.The key influence factors and the correlation between ground surface deformation and retaining wall deformation are then analyzed.The results show that,with the increase of excavation depth,excavation depth will have greater influence on the deformation,the maximum lateral displacement of the diaphragm wall will keep moving down,and the maximum ground settlement will gradually moving away from the edge of foundation pit.The lateral displacement of the diaphragm wall and the ground surface settlement tend to increase with the increase of foundation pit's length-width ratio,but the final values tend to remain steady.The foundation pit deformation is less influenced by the insertion ratio,while it is obviously influence by the thickness of diaphragm wall.With the increase of support stiffness,the lateral displacement of the diaphragm wall and the ground surface settlement tend to decrease,but the excessive support stiffness will not be supposed to meet the requirement of deformation control.Eventually,the ratio between the maximum ground surface settlement and the maximum lateral displacement is 1.15,and the ration between the envelop area of the ground surface settlement and that of the lateral displacement is 1.82.
Keywords：subway stationdeep foundation pitdeformation characteristicground surface settlementinfluence factor
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 25-33 )