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文章针对凤凰山隧道围岩具有岩体破碎、节理裂隙发育、溶蚀严重、强度低、稳定性差等特点,结合隧道出口处于超浅埋泥岩地段,遇水易发生塌方病害的工程实际,提出了超浅埋泥岩隧道进出口段处治技术。施工前应对地形地貌、不良水文地质及围岩特性等情况进行详细调查,施工中采用挂网喷锚防护措施和超前管棚支护手段,并辅以必要的监控量测。
In view of the fact that the surrounding rock of Fenghuangshan Tunnel has such characteristics as rock mass crushing, development of joint and fissures, serious erosion, low strength and poor stability, combined with the fact that the exit of the tunnel is located in the ultra-shallow buried mudstone area, Treatment Techniques for the Entrance and Exit Section of Shallow Mudstone Tunnels. Before construction, the topography and geomorphology, bad hydrogeology and surrounding rock characteristics should be investigated in detail. In the construction, the net-spraying anchor protection measures and advanced pipe shed support measures are used, and the necessary monitoring measurements are supplemented.