Theoretical and numerical investigations on mining-induced fault activation and groundwater outburst of coal seam floor
Theoretical and numerical investigations on mining-induced fault activation and groundwater outburst of coal seam floor
复制标题
采动断层活化与煤层底板地下水突出的理论与数值研究
DOI：
10.1007/s10064-021-02245-y
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发表时间：
2021-05-05
影响因子：
4.2
通讯作者：
Liang, Zhengzhao
中科院分区：
文献类型：
--
作者：
Song, Wencheng;Liang, Zhengzhao
在含水层上方，特别是在正断层上盘进行的采矿活动，一般都有突水的危险。为了更好地理解断层底板突水的机理，采用解析和数值模拟方法，研究了开采和水力荷载驱动下断层活化的过程。分析了推进距离和断层倾角对地震波传播的影响。数值模拟结果与理论计算结果吻合较好。切向应力变化引起的断层活化与断层推进距离呈正相关，与断层倾角呈负相关。当开挖过程进入断层投影的水平范围时，应力集中系数显著增大，应力峰值和破坏带沿断层由深向浅沿着向煤层靠近。对于一定的推进距离，断层倾角越小，突水通道形成越早。研究结果揭示了承压水上方断层活化和煤层底板突水的理论机理，为地下工程中矿井水灾害的防治和风险评估提供了有价值的思路。
Mining activities carried out above an aquifer, especially in the hanging wall of normal faults, generally involve the risk of water inrush. For a better understanding of the mechanism inducing groundwater outburst through fault floor, the analytical and numerical simulation methods were applied to investigate the process of fault activation driven by mining and hydraulic loads. The influences of the advancing distance and fault dip were conducted. The results exhibit good agreement between the theoretical calculation and the numerical simulation. The fault activation by induced tangential stress change has a positive correlation with the advancing distance and a negative correlation with the fault dip angle. The stress concentration factor increases significantly when the excavation process enters the horizontal range of fault projection, following the stress peak and failure zone approaching the coal seam from deep to shallow along the fault. For the cases with a constant advancing distance, the smaller the fault dip is, the earlier the water-inrush channel will be formed. The research results in this study reveal the theoretical mechanism of fault activation and groundwater inrush of coal seam floor above a confined aquifer and thus provide valuable insights for the prevention and risk assessment of mine water disasters in underground engineering.