断层倾角对断层活化及底板突水的影响研究

RESEARCH ON EFFECT OF FAULT DIP ON FAULT ACTIVATION AND WATER INRUSH OF COAL FLOOR

针对含断层缺陷底板的受力特征,建立相应的简化力学模型,分析得到断层面上的剪切应力和法向应力表达式,并研究断层倾角对断层面上剪切应力、法向应力及断层活化的影响规律。同时运用RFPA2D-Flow软件,模拟不同倾角的正断层在采动影响下底板的裂隙分布、渗流分布及采空区底板涌水量变化特征。模拟结果在一定程度上揭示含断层构造底板突水通道的形成机制及断层倾角对底板突水的影响规律。研究表明,断层倾角越大,断层越容易活化与突水。研究结果对采场底板含断层缺陷时防水煤柱的留设具有重要的参考价值。

According to the stress characteristics of coal floor with faults, corresponding simplified mechanical model is built to obtain the equations of shear stress and normal stress on the fault, as well as the influential rules of fault dip on shear stress, normal stress and fault activation. At the same time, under the circumstances of different normal fault dips, the fracture distributions and seepage distribution of coal floor as well as the variation characteristics of inflow quantity of coal floor in the mined area are simulated with mining carried out by using the RFPA^2D-Flow software. The numerical simulation reveals the formation principle of water inrush channel in coal floor with fault structure as well as influential rule of fault dip on water inrush in coal floor. Overall, the results indicate that normal faults with low dip angles are more easily activated to induce water inrush in coal floor, which has an important value in the case of coal floor with faults when waterproof coal pillars are needed.