高边仰坡下方隧洞群开挖施工的安全性分析  

Safety Analysis for Tunnel Group Excavation under High Slopes

作　　者：张安睿[1] ZHANG Anrui(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550009,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550009

出　　处：《安全与环境工程》2022年第1期68-76,共9页Safety and Environmental Engineering

基　　金：贵州省科技攻关计划项目(黔科合重大专项字[2018]3011)。

摘　　要：高边仰坡下方隧洞群开挖施工顺序对于保证边坡稳定及隧道洞室稳定性具有重要的意义。基于有限元数值分析软件建立了绿汁江特大桥隧道锚、连拱隧道及边仰坡稳定性分析的工程地质模型,对隧道锚及连拱隧道交叉施工的互相影响进行了数值模拟,分析了高边仰坡下方隧洞群开挖施工过程中围岩的变形、塑性区发展过程,并对隧洞群及边仰坡稳定性进行了评价。结果表明:高边仰坡防护施工完成后,主线连拱隧道左洞、右幅隧道锚以及主线连拱隧道右洞开挖对边仰坡、右侧边坡的影响小,边仰坡及右侧边坡处于稳定状态;主线连拱隧道左洞开挖超过15 m后方可开始右幅隧道锚的施工;右幅隧道锚开挖和主线连拱隧道右洞开挖10 m范围内洞室稍有变形,但在安全变形允许范围内。通过对隧洞群实际开挖后围岩变形监测数据的分析可知,数值计算结果与围岩变形值相吻合,且整体处于安全状态,进一步证明了本文提出的高边仰坡下方隧洞群开挖安全控制技术的合理性。该研究成果可为类似工程的施工建设提供一定的借鉴。The excavation sequence of tunnel group under high slopes is of great significance to ensure the stability of the slopes and caverns.Based on the finite element numerical analysis software, an engineering geological model for the stability analysis of the tunnel anchor, multi-arch tunnel and side slope of the Lyuzhijiang Bridge is established, and the mutual influence of the tunnel anchor and the multi-arch tunnel construction is simulated.Through the analysis of the surrounding rock deformation and the development of the plastic zone during the construction process, the results show that the left main tunnel, the right tunnel anchor and the right main tunnel excavated opposite the side elevation and right side after the slope landslide treatment.The influence of the slope is small, and the side slope and the right side slope are in a stable state;the left tunnel can be excavated more than 15 m before the construction of the right tunnel anchor can be started.The direction of the displacement of the tunnel floor is changed to avoid the cross-effect of the left main tunnel and the right anchor tunnel;the tunnel excavation of the right tunnel deforms slightly within 10 m, but within the scope of safe deformation.It can be known that the surrounding rock deformation value is consistent with the numerical calculation result through the analysis of the monitoring data of surrounding rock deformation after the actual excavation of the cavern group, and the overall project is in a safe state, which further proves the effectiveness of safety control technology for tunnel group excavation under high slopes proposed in this paper.The research results can provide reference for the construction of similar projects.

关 键 词：高边仰坡 隧洞群开挖 隧道锚 连拱隧道 数值计算 安全控制 

分 类 号：X948[环境科学与工程—安全科学] U458[建筑科学—桥梁与隧道工程]