双护盾TBM小半径曲线掘进穿越破碎带施工技术  

Key Technology for Double Shield TBM Small Radius Curve Excavation Crossing Fractured Zone

作　　者：刘元忠 LIU Yuanzhong(China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]中铁十八局集团有限公司,天津300000

出　　处：《国防交通工程与技术》2024年第5期46-50,共5页Traffic Engineering and Technology for National Defence

摘　　要：青岛4号线某区间采用双护盾TMB施工,该区间具有连续小曲线半径掘进、频繁穿越破碎带及穿越临近既有结构的特点,采取了超前地表及洞内注浆、豆砾石回填与灌浆、优化TBM设计和加强管片选型及安装等技术措施,监测结果显示地表和拱顶沉降符合安全容许值,隧道周边收敛速度有明显减缓趋势。说明采用的技术措施科学有效,实现了双护盾TBM穿越破碎带的围岩变形控制,为复杂地质条件的小半径曲线双护盾TBM施工提供了借鉴与参考。In a section of Qingdao Line 4,double shield TBM was utilized.This section features continuous small-radius curve excavation,frequent crossing of fractured zones,and proximity to existing structures.Technical measures such as advanced surface and tunnel grouting,gravel backfill and grouting,optimized TBM design,and enhanced segment selection and installation were implemented.Monitoring results indicate that surface and vault settlements are within safe allowable limits,and the convergence rate around the tunnel shows a significant slowing trend.These findings demonstrate that the adopted technical measures are both scientific and effective in controlling surrounding rock deformation during the double shield TBM crossing of fractured zones.This provides valuable reference for similar double shield TBM projects of small-radius curve under complex geological conditions.

关 键 词：双护盾TBM 地铁隧道 围岩破碎带 连续小半径曲线 豆砾石回填 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]