Analysis of influence of excavation parameters of double-line shield tunnel on induced surface settlement
WANG Haifeng
ZHANG Jiaxin
ZHAO Mingzhe
WANG Shuaifei
JI Xiaoyi
Abstract：Taking the shield tunnel project from Shenqiao Station to Yinwang Station of Nanchang Rail Transit Line 2 as the research object,the influence on land surface settlement of grouting layer thick-ness,depth-diameter ratio and distance between two parallel tunnels on land surface settlement was studied by ABAQUS finite element software.The results showed that the thickness of grouting layer was inversely proportional to the surface settlement,and the optimal grouting layer thickness was 0.30 m.With the increase of depth-diameter ratio,the transverse settlement of the surface would first increase and then decrease,which was closely related to the arch effect of the soil.In addition,the in-crease of the spacing of the two parallel tunnels was positively correlated with the increase of the sur-face settlement of the left and right tunnels.At a smaller spacing,the mutual interference of the tun-nels was enhanced,showing a"V"shaped settlement groove,while at a larger spacing,the mutual interference was weakened,showing a"W"shaped settlement groove.
Keywords：shield tunnelingground surface settlementnumerical simulationgrouting layer thicknesscover-to-depth ratiodistance between parallel tunnels
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 77-84 )