软土场地双线盾构地铁隧道施工数值模拟分析  

Numerical Simulation Analysis of Shield Construction of Double-track Shield Subway Tunnel in Soft Soil Site

作　　者：王刚[1] 张津钰 吕杨 WANG Gang;ZHANG Jinyu;LVYang(Tianjin Construction Engineering Co.,Ltd.of China Railway First Engineering Group,Tianjin300250,China;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin300384,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin300384,China)

机构地区：[1]中铁一局集团天津建设工程有限公司,天津300250 [2]天津市土木建筑结构防护与加固重点实验室,天津300384 [3]天津城建大学土木工程学院,天津300384

出　　处：《施工技术（中英文）》2024年第3期35-41,共7页Construction Technology

基　　金：国家自然科学基金(52178295);天津市研究生科研创新项目(2022SKYZ169)。

摘　　要：以天津软土场地某双线盾构地铁隧道为研究对象,数值模拟了地铁盾构隧道掘进过程,研究不同计算方法、不同隧道埋深以及不同双线净距对地表沉降的影响。研究结果表明,双线净距越大、隧道埋深越小时,等效圆法所得的地表沉降结果与工程经验相差较大,不适用于双线隧道盾构施工地表沉降预测;叠加法能考虑双线隧道的相互干扰作用,获得地表W形沉降曲线;双线净距较大且隧道埋深较小时,地表沉降呈W形沉降模式,其他情况下均为V形沉降模式,地表沉降最大值随着隧道埋深和双线净距的增大而减小。Taking a double-track shield tunnel in a soft soil site in Tianjin as the research object,the excavation process of the subway shield tunnel was numerically simulated,and the effects of different calculation methods,tunnel burial depths and double-track clearance on surface settlement were studied.The research results indicate that the larger the net distance between double-track and the smaller the tunnel burial depth,the greater the difference between the surface settlement results obtained by the equivalent circle method and engineering experience,and it is not suitable for predicting surface settlement during double-track tunnel shield tunneling construction.The superposition method can consider the mutual interference of double-track tunnels and obtain a surface W-shaped settlement curve.When the double line clearance is large and the tunnel burial depth is small,the surface settlement follows a W-shaped settlement pattern,while in other cases it follows a V-shaped settlement pattern.The maximum surface settlement decreases with the increase of tunnel burial depth and double line clearance.

关 键 词：双线隧道 盾构 软土 沉降 有限元分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]