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九顶山隧道是新楚(雄)—大(理)高速公路的控制性工程,隧址区的地应力特征研究对于公路隧道选线及施工具有重要意义。本文以九顶山隧道为研究对象,通过对隧址区地形地貌、地质构造、地层岩性的调查,充分掌握其工程地质条件。同时采用水压致裂法测量原地应力,确定隧道围岩的应力状态。结合岩土力学参数,运用工程岩体分级判别法、Russenes判别法、Hoek判别法对隧道围岩岩爆进行预测分析。结果表明:最大主应力方向为349°,埋深大于400m硬质脆性的中风化白云质灰岩存在发生轻微岩爆或围岩较大变形的可能性。
The Jiudingshan Tunnel is a controlled project of the Xinchu-Dali Highway, and the study of the stress characteristics in the tunnel area is of great significance to route selection and construction of highway tunnels. In this paper, the Jiudingshan tunnel as the research object, through the topography of the tunnel area, geological structure, stratigraphy lithology survey, fully grasp the engineering geological conditions. At the same time, the in-situ stress was measured by hydraulic fracturing and the stress state of surrounding rock was determined. Combined with the parameters of geotechnical engineering, the rock mass blasting of tunnel surrounding rock is predicted and analyzed by the classification method of engineering rock mass, Russenes discriminant method and Hoek discriminant method. The results show that there is a possibility of occurrence of slight rock burst or large deformation of the surrounding rock in the medium-weather dolomitic limestone with a maximum principal stress of 349 ° and a buried depth of more than 400 m.