深部岩体群洞开挖顺序对围岩稳定性影响分析

Analysis on the Long-term Stability of Porous Deep Tunnel Excavation with Different Sequence

针对多孔隧洞围岩开挖的长期稳定性,以锦屏二级水电站引水隧洞为工程背景,对三种不同的开挖工况进行模拟分析,研究多孔隧洞开挖顺序对围岩长期稳定性的影响。得到了洞室间隔开挖,应力集中范围较小,发生滞后岩爆等围岩变形破坏的可能性小,因此,对于多洞隧道开挖采用间隔开挖法有利于降低滞后岩爆的风险。

In order to research the long-term stability of the multi-chamber＆#39;s excavation, Jinping II Hydropower Station＆#39;s diversion tunnel as the background, three different excavation conditions are simulated and analyzed to study long-term stability of the porous tunnel excavation with different sequence. The range of stress concentration is a small area. The possibility of delayed rock-burst is very little. Therefore,the risk of delayed rock-burst can be reduced with bay excavation sequence for the porous tunnel.