东祁连山3#斜井软弱围岩变形控制技术

The Control Technology of Soft and Weak Perimeter Rock in 3#Inclined Shaft in East Qilian Mountain

为解决过软弱围岩隧道变形大、难以控制的问题,以东祁连山3#斜井为工程背景,通过现场勘测和数值模拟等方法分析了隧道变形破坏特征。根据分析结果,提出了“长短锚杆(索)+钢筋网+喷射混凝土+二次衬砌”的联合支护方案。现场监测结果表明,联合支护方案下隧道拱顶和边墙的最大变形量分别为81 mm和67 mm,围岩压力变化不大,表明隧道结构基本稳定,满足规范要求,有效控制了东祁连山隧道3#斜井围岩变形破坏。研究可为同类地质条件下的隧道支护设计与施工提供参考与借鉴。

The deformation and failure characteristics of East Qilian Mountain No.3 inclined shaft tunnel during the excavation process were analyzed through on-site investigation and numerical simulation.To address significant deformation and complex control challenges in tunnels with weak surrounding rock,a combined support scheme of"long and short anchor rods(cables)+reinforced mesh+shotcrete+secondary lining"was proposed.Under the joint support scheme,the maximum deformation of the tunnel arch and sidewall is 81 mm and 67 mm respectively,meeting specification requirements.Additionally,the surrounding rock pressure remains relatively stable,indicating that the tunnel has reached a stable state.In summary,the proposed support scheme effectively controlled the deformation and failure of the surrounding rock in the East Qilian Mountain No.3 inclined shaft tunnel.This approach provides an important reference for the design and construction of tunnel support under similar geological conditions.