针对兰渝铁路玄真观隧道施工过程中出现“不同寻常”的变形破坏现象，文章通过室内试验、现场测试、理论分析等方法，查明围岩强度特征、岩石膨胀特性、隧道地应力特征，对隧道变形破坏特征及机制进行分析。分析表明地层特性、地质构造、施工质量、地应力等是影响隧道变形破坏的主要因素，特别是局部高地应力，控制着隧道整体变形。分析建立了地应力与隧道变形破坏的关系，获得了隧底和拱顶变形破坏模式，在此基础上提出玄真观隧道变形破坏处理对策。实践表明，提出的处理措施具有针对性，是可行的，可为以后类似工程建设提供参考。%According to the"unusual" deformation and failure of Xuanzhenguan Tunnel of Lanzhou-Chongqing Railway, this paper analyzes the deformation characteristics and failure mechanism of the tunnel based on indoor, field test and theoretical analysis to get strength of rock mass, expansive characteristics and in-situ stress. It shows that the main fac-tors that influence the deformation and failure of the tunnel are formation characteristics, geologic structure, construction quality , in-situ stress and other factors, especially the local high in-situ stress which determines the global deformation of the tunnel. The relation between in-situ stress and deformation and the failure mechanism of tunnel bottom and crown are obtained and the treatment measures of Xuanzhenguan tunnel are put forward. The practices show that the treatment measures in this paper is feasible and can be a reference for similar projects in the future.
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