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为了提高施工效率,降低现场施工人员和设备的风险,锦屏二级水电站1#,3#引水隧洞采用大断面TBM进行施工。超大埋深TBM全断面施工,对于等级较强的岩爆,仍然可能会给TBM设备带来一定伤害。为此,通过微震实时监测和数值分析等手段,开展TBM施工速度、导洞施工等TBM开挖方案对岩爆风险的影响研究。结果表明,降低TBM施工速率,有利于降低岩爆发生的风险;导洞施工+TBM联合施工对于极强岩爆风险的防范是十分有利的。研究成果可为TBM安全快速掘进提供重要的参考价值,也将为其他工程提供借鉴,具有重要的工程价值。
In order to improve the construction efficiency and reduce the risk of on-site construction personnel and equipment, 1 # and 3 # diversion tunnels of Jinping II Hydropower Station are constructed with large cross-section TBM. Large depth TBM full cross-section construction, for a strong level of rock burst, TBM equipment may still cause some damage. Therefore, by means of microseismic real-time monitoring and numerical analysis, the impact of TBM excavation program, such as TBM construction speed and pilot tunnel construction, on rock burst risk is studied. The results show that reducing the construction rate of TBM is helpful to reduce the risk of rock burst. The combination of pilot tunnel construction and TBM joint construction is very good for the prevention of extremely strong rock burst risk. The research results can provide important reference value for TBM safe and fast driving and also provide reference for other projects, which have important engineering value.