采动影响下底板隐伏小断层突水灾变规律研究
Research on water inrush disaster law from coal mine floor with concealed small fault under mining
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摘要: 为研究采动影响下底板隐伏小断层的突水灾变规律，以赵固一矿16001工作面为背景，在考虑岩体渗透系数以及孔隙率随体积应变变化的基础上，对采动过程中围岩的剪应力、位移、塑性区、涌水量等进行了分析，研究了隐伏小断层导水性以及水压对工作面突水灾变的影响规律。结果表明：隐伏小断层向工作面内突水具有较大的滞后性以及突发性，只有当采面超过隐伏小断层24 m后，工作面底板剪切裂隙带才能与隐伏小断层连通形成导水裂隙通道，使工作面底板涌水量由2.9 m3/h直接跃至46.6 m3/h；隐伏小断层导水性较差情况下，底板围岩在采动影响下的剪切屈服带不会发育至断层顶部，也不会诱发隐伏小断层活化突水；隐伏小断层水压越高，工作面底板剪切屈服带向隐伏小断层方向扩展延伸的尺度就越大，当达到临界值时，两者就会贯通形成导水裂隙通道。Abstract: In order to study the water inrush catastrophic law of the coal mine floor with concealed small fault under the influence of mining, the 16001 working face of Zhaogu No.1 Coal Mine is taken as the background, and the changes in the permeability coefficient and porosity of the rock mass with the volumetric strain are considered, and the shear stress of the surrounding rock during the mining process is considered. On this basis, the influence of concealed fault water conductivity and water pressure on the law of water inrush catastrophe of working face is studied. The research results show that the water inrush from the concealed small fault has a large hysteresis and suddenness in the working face. Only when the working face exceeds the concealed small fault by 24 m, the shear fissure zone of the working face floor can connect with the concealed small fault to form a water-conducting fissure channel, the floor water inflow of the working face can be directly jumped from 2.9 m3/h to 46.6 m3/h. When the water conductivity of the concealed small fault is poor, the shear yield zone of the floor surrounding rock under mining will not develop to the top of the fault and will not induce concealed faults to activate water inrush; the higher the hydraulic pressure of the concealed fault, the larger the scale of the working face floor shear yield zone extending toward the concealed fault. When the critical value is reached, the two will penetrate to form a water-conducting fissure channel.
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Keywords:
- concealed small fault /
- working face /
- water inrush /
- FLAC3D /
- permeability coefficient /
- mine water inflow
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