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硬脆性大理岩条件下深埋隧洞的岩爆问题是西部开发建设中遇到的工程难题之一。文中通过对锦屏二级水电站辅助洞、施工排水洞与引水隧洞施工中发生的岩爆规律与特征的分析总结,提出了该地区地质条件下岩爆的基本条件、分类、风险分区、时空分布特征等。文中阐述了岩爆防治设计思想与原则,并从设法降低潜在震源区的应力水平与设法提高围岩的抗震(抗冲击)能力两个方面出发,针对TBM掘进与钻爆法掘进的不同开挖方案,分别提出了不同的岩爆防治措施。
The rockburst problem of deep buried tunnel under the condition of hard and brittle marble is one of the engineering problems encountered in the development and construction of the western region. Through analyzing and summarizing the regularity and characteristics of rockburst during the construction of auxiliary tunnel, construction drainage tunnel and diversion tunnel in Jinping Ⅱ Hydropower Station, this paper puts forward the basic conditions, classification, risk division and space-time distribution of rock burst under geological conditions in this area. Features and more. In this paper, the design ideas and principles of rockburst prevention and treatment are elaborated. In order to reduce the stress level in potential source regions and to improve the seismic resistance (impact resistance) of surrounding rock, aiming at the different excavation of TBM Program, respectively, put forward different rock burst control measures.