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水平层状围岩由于结构特殊,当隧道穿越水平层状围岩时,极易在隧道拱部发生离层、掉块甚至滑塌等工程事故。对水平层状围岩结构特征、变形特征以及变形机理等进行了分析。同时对现有水平层状围岩隧道施工经验进行总结,提出了减少超欠挖、加强支护、控制施工安全距离以及将强超前预报等施工控制措施。这对于层状围岩隧道施工建设具有重要的参考价值。
Due to the special structure of the horizontal layered surrounding rock, when the tunnel passes through the horizontal layered surrounding rock, it is very easy to cause engineering accidents such as delamination, dropping or even sloughing in the tunnel arch. The structural characteristics, deformation characteristics and deformation mechanism of horizontal layered surrounding rock are analyzed. At the same time, the existing experience in construction of horizontal layered surrounding rock tunnels is summarized, and some construction control measures such as reducing over-under-excavation, strengthening support, controlling the construction safety distance, and applying strong advance prediction are proposed. This has important reference value for the construction of layered surrounding rock tunnel.