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首页> 外文期刊>Bulletin of engineering geology and the environment >Rockburst characteristics and numerical simulation based on a new energy index: a case study of a tunnel at 2,500 m depth
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Rockburst characteristics and numerical simulation based on a new energy index: a case study of a tunnel at 2,500 m depth

机译:基于新能源指数的摇滚乐特征及数值模拟:2,500米深度隧道的案例研究

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摘要

Rockburst is one of the most difficult problems encountered in the pilot tunnels of the Jinping II hydro-power station, where the rock cover is up to 2,500 m. Some typical characteristics of the rockburst events are summarized. These events indicate the intrinsic reason of rockburst is energy release. In order to understand the outburst mechanism, a new energy index, the Local Energy Release Rate (LERR), is put forward to simulate the conditions causing rockburst. By tracking the peak and trough values of elastic strain energy intensity before and after brittle failure, the LERR was developed to help understand rockburst from the viewpoint of energy release. To test its reliability, the brittle breakage of Mine-by tunnel rock in Canada and two rock bursts in the Jinping pilot tunnels were simulated. The results showed that LERR can satisfactorily predict the intensity of a rockburst and the depth of the outburst pit. Although it is not yet possible to determine thresholds at which rockbursts will occur, the study indicates the potential of LERR for evaluating rockbursts in deep underground excavations.
机译:Rockburst是金平II水电站试点隧道中遇到的最困难问题之一,岩石覆盖率高达2,500米。总结了岩爆事件的一些典型特征。这些事件表明了摇滚乐的内在原因是能量释放。为了了解爆发机制,新能源指数,本地能量释放率(LERR),提出模拟导致摇滚乐的条件。通过在脆性失败前后跟踪弹性应变能强度的峰值和槽值,从能量释放的观点来看,LERR被开发为帮助理解岩爆。为了测试其可靠性,模拟了加拿大隧道岩石的脆性破损,并模拟了金平导航隧道中的两个岩石爆裂。结果表明,LERR可以令人满意地预测摇滚爆发的强度和爆发坑的深度。虽然尚不可以确定摇滚乐将发生的阈值,但该研究表明LERR用于评估深层地下挖掘中的岩虫的潜力。

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