摘要
为研究软弱黄土隧道塌方处治效果,文章以宝天高速某隧道洞口段塌方治理工程为依托,分析了隧道塌方的主要原因,提出采用超前大管棚与注浆小导管相结合、洞内与地表共同治理的综合处治措施,并通过现场实测与数值计算相结合的方法详细分析了处治效果。结果表明:地形浅埋偏压、设计偏于不安全、降雨通过地表裂缝浸泡围岩等因素最终导致隧道坍塌、地表塌陷;处治后塌方段初期支护和二次衬砌的变形及受力在20 d后趋于稳定,且均未发生异常变化,处治效果良好;现场监测和数值计算的拱顶沉降和周边收敛规律基本一致,相关变化值都在规范的允许范围之内,处治后隧道结构处于稳定状态。研究结果可为类似隧道工程塌方处治提供借鉴。
In order to study the effects of the treatment of collapses in loess tunnels, the main reasons for tunnel collapse are analyzed and such treatment measures as the combination of a large pipe-roof and small pipe grouting, surface treatment and treatment inside a tunnel are put forward based on the collapse event that occurred at the portal of the Ganquan tunnel on the Baotian expressway. Treatment effects are analyzed by numerical simulation and field experiments. The analysis results show that if the tunnel is buried shallowly and unsymmetrical in terms of topography, the original design concept is unsafe and the surrounding rock is soaked with water from rainfall coming in from surface cracks, it would ultimately result in tunnel collapse and surface subsidence; the deformation and force applied on the initial support and secondary lining tend to be stable and no abnormal changes occur 20 days after treatment; and the calculation results of the crown settlements and peripheral convergence basically agree with the measured results and the changed values are within the scope of the specification, with the tunnel structure being stable after treatment.
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第2期194-201,共8页
Modern Tunnelling Technology
基金
中央高校基本科研业务费专项基金项目(310821172004
310821153312
310821165011)
交通运输部西部交通建设科技项目(200731800018)
关键词
黄土隧道
塌方
现场监测
数值分析
处治措施
Loess tunnel
Collapse
In-situ monitoring
Numerical analysis
Treatment measure
