软弱围岩隧道初支侵限原因分析及处置方案  

Analysis of Causes and Solutions for Initial Support Intrusion in Tunnels with Weak Surrounding Rock

作　　者：谷成岳 GU Chengyue(Qinghai Huangyuan Highway Engineering Construction Co.,Ltd,Xining,Qinghai,810000,China)

机构地区：[1]青海省湟源公路工程建设有限公司,青海西宁810000

出　　处：《石家庄铁路职业技术学院学报》2024年第3期8-12,18,共6页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：以香草隧道出口段初期支护的变形侵限、结构开裂等工程问题为依托,对初支拱顶和边墙观测点进行监控量测,关注其最大累积变形量。根据初支变形情况及超前地质预报分析初支变形侵限原因并提出相应处置方案,通过数值模拟和现场试验对方案效果进行验证和评估。结果表明:由于该区段岩体整体较为破碎,呈层状构造稳定性较差,从而导致拱脚水平方向约束不足,周边收敛变形较大,侵入二衬空间。将衬砌类型Vb型变更为Vc加强型,增强初支参数可有效控制隧道周边收敛变形量。This paper is based on the engineering problems of deformation intrusion and structural cracking of the initial support of the exit section of the Xiangcao Tunnel.The observation points of the primary support arch and side wall are monitored and measured,and the maximum cumulative deformation is paid attention to.According to the initial support deformation and advanced geological prediction,the cause of the initial support deformation intrusion is analyzed and the corresponding treatment plan is proposed.The effect of the plan is verified and evaluated through numerical simulation and field tests.The results show that due to the overall fragmentation of the rock mass in this section,which exhibits poor stability in a layered structure,the lack of horizontal restraint at the arch foot leads to significant peripheral convergence deformation,intruding into the space of the secondary lining.Changing the lining type from Vb to reinforced Vc and enhancing initial support parameters effectively control the peripheral convergence deformation of the tunnel.

关 键 词：软弱围岩 隧道工程 初支侵限 数值模拟 防治措施 

分 类 号：U455[建筑科学—桥梁与隧道工程]