秦岭翠华山特长隧道高地应力问题研究

研究目的:关于深埋长大隧道高地应力问题,业界存在许多理论和判据,不同行业、不同项目采用的判据各有不同。究竟如何预判岩爆地质灾害,有效指导安全施工。通过秦岭翠华山特长隧道勘察预判和施工验证,研究隧道高地应力问题及如何预判岩爆灾害。研究结论:秦岭翠华山特长隧道最大水平主应力方向与隧洞轴线方向夹角偏大,发生岩爆是不可避免的;基于地应力参数和岩石参数计算得出洞身开挖时存在岩爆可能性的结论,具有一定的片面性;翠华山隧道施工实践证明,在众多理论和判据中,应该多采用几种判据,综合分析后评价岩爆问题,更能接近于实际。

Study on High Stress of Cuihuashan Super Long Tunnel in Qinling Mountain Area

Research purposes: About of the high stress of the deep-buried long tunnel,there are many theories and criterions,and the different criterions are used for the different industries and projects.How to predict the geological disaster of rock outburst to direct the safe construction is a question.Through the survey prediction and construction verification of the Cuihuashan Super Long Tunnel in Qinling Mountain area,this paper studies the issues of the high stress of tunnel and how to predict the geological disaster of rock outburst. Research conclusions:As the included angle between the maximum horizontal principal stress direction and tunnel axis direction of the Cuihuashan Super Long Tunnel is over large,the rock outburst is inevitable.The conclusion that there is possible to happen thge rock outburst obtained by calculating stress parameters and rock parameters has a certain one-sidedness.The construction practice of the Cuihuashan Tunnel proves that the rock outburest should be assessed by using various criterions to make the prediction closer to the actual situation.