富水复合地层暗挖隧道盖挖法施工关键技术  

Key Technologies for the Cover Excavation Method in Buried Tunnel Within Water-Rich Composite Strata

作　　者：吴健 WU Jian(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66-70,共5页Traffic Engineering and Technology for National Defence

摘　　要：成都地铁十八号线某暗挖隧道穿越富水复合地层,其中卵石层含水量大对隧道施工影响大,暗挖隧道采用拱盖法施工。以该暗挖隧道为研究对象,提出了超前加固形成止水帷幕、洞内明排相结合的地下水控制技术,并优化了超前支护加固方案;并实时监测隧道开挖过程中地表沉降、拱部竖向位移、净空收敛变形。研究表明,地表沉降、隧道结构变形在隧道施工过程中逐步增大,导洞开挖和中隔壁拆除会引起地表沉降、隧道结构变形显著增大;最大地表沉降小于30 mm、最大拱部竖向位移和净空收敛小于10 mm,说明本工程设计方案能保证隧道及周边环境的安全。A buried tunnel in Chengdu Metro Line 18 passes through a water-rich composite stratum,where the high water content in the pebble layer poses significant challenges for tunnel construction.The tunnel was constructed using the arch cover method.This study focuses on this buried tunnel and proposes a groundwater control strategy that integrates advanced reinforcement techniques to form a waterproof curtain with open drainage inside the tunnel.Additionally,the advanced support reinforcement scheme was optimized.Real-time monitoring was conducted to track surface settlement,vertical displacement of the tunnel arch,and clearance convergence deformation during excavation.The results indicate that surface subsidence and tunnel structural deformation gradually increase during tunnel excavation.Furthermore,pilot tunnel excavation and the removal of intermediate walls lead to significant increases in surface subsidence and structural deformation.The maximum surface subsidence remained below 30 mm,while the maximum vertical displacement of the tunnel arch and clearance convergence remained below 10 mm,demonstrating that the adopted design scheme effectively ensures the safety of both the tunnel and the surrounding environment.

关 键 词：富水复合地层 拱盖法 超前支护 加固方案优化 

分 类 号：U231.3[交通运输工程—道路与铁道工程]