Abstract Rockbursts in deep tunnels subjected to high crustal stress were investigated using a general particle dynamics (GPD) code with the Holmquist–Johnson–Cook damage model (HJC). Under dynamic excavation disturbance, several numerical tests were carried out to investigate the dynamic failure patterns of surrounding rock masses with different preexisting cracks around deep tunnels. The numerical results showed that the GPD code can satisfactorily simulate the phenomenon of rockburst caused by crack evolution, including predicting the ejection velocity, rockburst location and ejected rock block volume. Moreover, the analysis of the circumferential stress in the surrounding rock of deep tunnels at the Jinping II Hydropower Station shows the efficiency of the GPD code. In addition, four typical rockburst, which occurred under different geological conditions at the Jinping II Hydropower Station, were analyzed by using the GPD code. The numerical simulations suggested that the GPD code can efficiently reproduce the 2D and 3D crack growth in the surrounding rock, which eventually leads to the occurrence of rockburst.

中文翻译：

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深部隧道围岩岩爆定量分析

摘要 使用通用粒子动力学 (GPD) 代码和 Holmquist-Johnson-Cook 损伤模型 (HJC) 研究了承受高地应力的深隧道中的岩爆。在动态开挖扰动下，开展了多项数值试验，研究了深部隧道周围不同预存裂缝围岩的动态破坏模式。数值结果表明，GPD程序能够较好地模拟裂缝演化引起的岩爆现象，包括预测弹射速度、岩爆位置和弹射岩块体积。此外，锦屏二级水电站深埋隧道围岩周向应力分析显示了GPD程序的有效性。此外，还有四种典型的岩爆，使用GPD代码对锦屏二级水电站不同地质条件下发生的事故进行了分析。数值模拟表明，GPD 代码可以有效地再现围岩中 2D 和 3D 裂纹扩展，最终导致岩爆的发生。