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马垭口隧道围岩以泥岩为主,裂隙发育,地下水丰富,主要为Ⅴ和Ⅵ级。在建设过程中,隧道内产生大面积坍塌。本文从岩性条件、地下水情况以及隧道设计参数等方面,探讨了该隧道塌方的机理,并采用FLAC2D软件对渗流场和应力场耦合作用下的围岩变形和支护结构受力进行分析。基于对隧道塌方原因的正确认识,制定了未塌方段的加固方案和塌方段的加固与开挖方案。通过监测隧道变形、围岩与支护间接触压力等方面对隧道塌方治理方案进行综合评价。从实施情况可以看出,处理方案取得了较好的效果,确保了隧道施工安全稳定。
Ma Yakou tunnel surrounding rock to mudstone-based, fissures, groundwater rich, mainly Ⅴ and Ⅵ. During the construction process, large-scale collapse occurred in the tunnel. In this paper, the mechanism of landslide is discussed in terms of lithology conditions, groundwater conditions and tunnel design parameters. The deformation of surrounding rock and the supporting force under the coupling of seepage field and stress field are analyzed by FLAC2D software. Based on the correct understanding of the causes of tunnel collapse, the reinforcement scheme and the excavation scheme of the collapsed segment are formulated. By comprehensively monitoring the tunnel deformation, the contact pressure between the surrounding rock and the support, the comprehensive evaluation of the tunnel collapse management plan is made. As can be seen from the implementation, the treatment plan has achieved good results, ensuring the safety and stability of the tunnel construction.