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全长超过16 km的锦屏二级深埋隧洞沿线经过不同的地质单元。在开挖过程中,岩爆的诱发受控于地质构造条件以及由其所导致的局部地应力场,其中与地质构造直接关联的构造型岩爆影响最为突出。系统总结国内外深部工程中岩爆研究的前沿成果,结合锦屏二级水电站深埋隧洞工程中大量岩爆案例所揭示的客观规律,将构造型岩爆进一步细分为端部构造型、滑移构造型和应变构造型岩爆。采用离散元程序和相关的岩爆风险评价指标,开展深入地岩爆案例反演和机制解译,揭示深埋隧洞工程不同类型构造型岩爆的发生机制,并分析该类工程环境下关键岩爆控制因素及各因素的控制机制。最后,针对不同类型的构造型岩爆,提出相应的防治方案,可以为类似工程提供借鉴。
Jinping second-level deep tunnel with a length of more than 16 km passes through different geological units. During the excavation process, the rockburst is controlled by the geological conditions and the local stress field caused by the rockburst. The tectonic rockburst that is directly related to the geological structure is most prominent. This paper summarizes the forefront achievements of rockburst in deep engineering both at home and abroad. Combining the objective laws revealed by a large number of rockburst cases in the deep-buried tunnel project of Jinping Hydropower Station, the structural rockburst is further subdivided into end-tectonic type, Migration modeling and strain structure rock burst. The discrete element program and related rock burst risk evaluation indexes are used to carry out in-depth case inversion and mechanism interpretation of rock burst to reveal the occurrence mechanism of different types of structural rockburst in the deep tunnel project and to analyze the key rock Explosion control factors and control mechanisms of various factors. Finally, for different types of structural rockburst, the corresponding prevention and control scheme is put forward, which can provide reference for similar projects.