大坡度盾构隧道施工变形特性研究  

Study on Deformation Characteristic of Shield Tunnel Construction of Large Slope

作　　者：薛复亮 XUE Fuliang(China Railway 18th Bureau Group Municipal Engineering Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团市政工程有限公司,天津300222

出　　处：《国防交通工程与技术》2025年第2期31-35,共5页Traffic Engineering and Technology for National Defence

摘　　要：为深入探究大坡度盾构隧道开挖对隧道周边地层和管片结构变形的影响,依托成都轨道交通18号线3期工程,采用数值模拟和现场监测相结合的方法,分析了大坡度隧道施工较直线隧道在变形特性上的差异,研究了大坡度盾构隧道施工过程中地层位移变化特征,揭示了不同坡度下隧道地表沉降和管片变形规律。研究结果表明:大坡度盾构隧道施工较直线隧道更容易引起地层不同位置处的不均匀沉降;大坡度盾构隧道施工引起的土体水平位移相对较小,竖向位移相对较大;下坡坡度越大,地表监测点隆起值和最大沉降越大,隆起值比最大沉降值对坡度的变化更为敏感;纵坡坡度从1.5%到4.5%,拱顶沉降和拱底隆起均随坡度的增大而增大,拱顶沉降变化幅度大于拱底隆起。研究结果有助于指导施工。To investigate the impact of large-slope shield tunnel excavation on the deformation of surrounding strata and segmental structure,this study integrates numerical simulation and field monitoring,based on the Chengdu Metro Line 18 Phase 3 project.The deformation characteristic of large-slope tunnel construction were compared with those of conventional straight tunnel,and the displacement patterns of the surrounding ground during shield tunneling in steep slopes were analyzed.The findings reveal that large-slope shield tunnel construction induces more pronounced differential settlement at different locations in the surrounding strata compared to straight tunnel excavation.The horizontal displacement of the soil caused by shield tunneling in steep slopes is relatively small,whereas vertical displacement is more significant.As the downhill slope increases,both surface uplift value and maximum settlement at monitoring points increase,with surface uplift being more sensitive to slope variations than maximum settlement.When the longitudinal slope increases from 1.5%to 4.5%,both the settlement at the tunnel vault and the uplift at the tunnel invert increase,with the settlement at the vault exceeding the uplift at the invert.The results of this study provide valuable insights for optimizing construction strategies in shield tunneling under large slope.

关 键 词：盾构隧道 大坡度 数值模拟 现场监测 地层位移 管片变形 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]