ISSN 1000-3665 CN 11-2202/P
    全永威,王军,熊永润,等. 爆破扰动下TBM隧洞时滞型岩爆特征及影响机制研究[J]. 水文地质工程地质,2023,50(1): 94-103. DOI: 10.16030/j.cnki.issn.1000-3665.202202042
    引用本文: 全永威,王军,熊永润,等. 爆破扰动下TBM隧洞时滞型岩爆特征及影响机制研究[J]. 水文地质工程地质,2023,50(1): 94-103. DOI: 10.16030/j.cnki.issn.1000-3665.202202042
    QUAN Yongwei, WANG Jun, XIONG Yongrun, et al. A study of the characteristics and influence mechanism of time delayed rockburst in a TBM tunnel under the blasting disturbance[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 94-103. DOI: 10.16030/j.cnki.issn.1000-3665.202202042
    Citation: QUAN Yongwei, WANG Jun, XIONG Yongrun, et al. A study of the characteristics and influence mechanism of time delayed rockburst in a TBM tunnel under the blasting disturbance[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 94-103. DOI: 10.16030/j.cnki.issn.1000-3665.202202042

    爆破扰动下TBM隧洞时滞型岩爆特征及影响机制研究

    A study of the characteristics and influence mechanism of time delayed rockburst in a TBM tunnel under the blasting disturbance

    • 摘要: 时滞型岩爆的发生通常具有很强的随机性,会对施工安全造成巨大的威胁,而开挖扰动、爆破扰动等均会对潜在时滞型岩爆区产生不同程度的影响。依托某隧道掘进机(TBM)引水隧洞,采用理论分析和对比分析法研究了拆机洞爆破开挖期间K54+000—K54+700段发生的5次时滞型岩爆,发现:(1)强烈岩爆和中等岩爆区位于缓倾断层附近,围岩发育短小隐节理和含充填的细密节理,轻微岩爆距断层远或位于正断层附近,除含充填的细密节理外,均至少发育1条含充填物的倾向SW的陡倾结构面;(2)TBM法开挖隧洞时滞型岩爆滞后爆破时间更长,滞后工作面距离更远,且爆破对TBM隧洞的扰动作用相对较小;(3)爆破扰动使得潜在时滞型岩爆区围岩失稳变得容易,从而加速了时滞型岩爆的进程。研究成果可为TBM隧洞时滞型岩爆的预警与防控提供参考。

       

      Abstract: The occurrence of time delayed rockburst usually has strong randomness and will pose a great threat to construction safety. Excavation disturbance and blasting disturbance will have impact of varying degrees on the potential time delayed rockburst area. It is of great significance to carry out studies of the characteristics and mechanism of time delayed rockburst in a TBM tunnel under the blasting disturbance. Based on a TBM headrace tunnel, five time delayed rockburst occurred in K54+000—K54+700 section during demolition tunnel blasting excavation are studied by using theoretical analysis and comparative analysis method. The results show that (1) strong and medium rockburst areas are located near gentle dip faults. Short and small concealed joints and fine joints with filling are developed in surrounding rocks. The slight rockburst is far from the fault or near the normal fault. Except for the fine joints with filling, at least one steep structural plane with filling tendency and dipping in SW direction is developed. (2) The time delayed rockburst of the TBM tunnel has longer delay blasting time and longer lag working face distance, and the disturbance effect of blasting on the TBM tunnel is relatively small. (3) Blasting disturbance makes it easy for the surrounding rock instability in the potential time delayed rockburst area, which accelerates the process of time delayed rockburst. The research results can provide a useful reference for the early warning and prevention of time delayed rockburst in TBM tunnels.

       

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