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Analysis of slab buckling rockburst of surrounding rock under dynamic and static combined disturbance
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.tust.2025.106417
Feng Chen, Ruxuan Li, Kaixing Wang, Yanhong Du, Chun’an Tang, Yishan Pan, Zhuo Dong

Slab buckling rockburst is a common form of rockburst under high ground stress conditions, posing a serious threat to engineering safety. Based on the catastrophe model of slab buckling rockburst of surrounding rock, the expressions of control variables of a single rock slab and combined rock slab under quasi-static effect in catastrophe theory are obtained. The tendency of rockburst in the deep-buried tunnel under quasi-static and dynamic-static combined disturbances are studied by theoretical analysis and numerical simulation methods using the case study of Jinping II Hydropower Station. The failure depth of surrounding rock during rockburst is quantitatively calculated from both theoretical and numerical simulation. The theoretical calculation results show that the failure depth of slab buckling rockburst in the surrounding rock of the auxiliary tunnel of Jinping II Hydropower Station under quasi-static effect is 0.16 m. The rockburst may occur when the angular frequency of the dynamic load is less than 13.49 rad/s under the dynamic and static combined disturbance, and a minimal dynamic disturbance with an amplitude of 7000 Pa may lead to a rockburst in the surrounding rock. Numerical simulations reveal that the displacement of the surrounding rock is 9.3 cm and the failure depth of the surrounding rock is 0.2 m. The values are consistent with the theoretical calculation results, indicating that the numerical simulation results of RFPA2D are reliable.

中文翻译:


动静联合扰动作用下围岩板屈曲岩爆分析



板屈曲岩爆是高地应力条件下常见的岩爆形式,对工程安全构成严重威胁。基于围岩板屈曲岩爆的灾害模型,得到了灾害理论中准静力作用下单个岩板和组合岩板的控制变量表达式。以锦屏二期水电站为例,通过理论分析和数值模拟方法,研究了准静力和动静力联合扰动作用下深埋隧道岩爆的趋势。岩爆期间围岩的破坏深度是通过理论和数值模拟定量计算的。理论计算结果表明:准静力作用下金屏二期水电站辅助隧道围岩中板屈曲岩爆的破坏深度为0.16 m。当动静联合扰动下动载荷的角频率小于 13.49 rad/s 时,可能发生岩爆,振幅为 7000 Pa 的最小动态扰动可能导致围岩发生岩爆。数值模拟表明,围岩位移为 9.3 cm,围岩破坏深度为 0.2 m。这些值与理论计算结果一致,表明 RFPA2D 的数值模拟结果是可靠的。
更新日期:2025-01-23
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