深埋长隧道地应力特征与岩爆预测

In-Situ Stress Charateristics and Prediction of Rockburst for Deep-Burying Long Tunnel

以沪蓉西高速公路上大量深埋长隧道为研究对象,采用水压致裂法进行了地应力测量,然后根据实测地应力资料,运用工程岩体分级标准判据法、陶振宇判据法和Hoek判据法对隧道岩爆进行了预测研究。结果表明:鄂西灰岩山区应力水平总体为中等偏高,最大水平主应力方向近EW向;埋深较深的坚硬岩石隧道有可能发生岩爆。为了充分保证施工的安全性,建议在施工过程中采取合理的开挖方式和防爆措施。

With the deep-burying long tunnel in Hurongxi expressway as an object of research, this article aims to use hydro-fracturing methods to measure geostress of some tunnels, located in limestone mountain- ous area in western of Hubei Province. Then based on the in-situ stress test results, the three rockburst distinguish methods （which are engineering rock quality classification standard, Tao Zhenyu method and Hock method） were used to predict the rockburst. It can be concluded that the in-situ stress magnitude in this area is classified as middle to high level, the direction of the maximum horizontal principal stress is near to east-west; and rockburst is predicted to occur in deep-seated and hard rock tunnel. In order to guarantee the safety of construction, reasonable excavation methods and safety precautions should be adopted during tunnel construction.