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采用FLAC5.02D数值模拟软件模拟了煤层开采过程中断层对矿山压力分布的影响.研究了不同断层倾角、断层强度、断层落差、老顶厚度和老顶强度下,工作面支承压力峰值变化规律.结果表明,工作面由断层上盘向断层推进:支承压力峰值随断层倾角减小而减小,当断层倾角为30°时,应力峰值降为60.92MPa,甚至会小于无断层影响下的63.18MPa;当老顶厚度超过20m,应力峰值迅速降为51.53MPa.而工作面由断层下盘向断层推进:应力峰值随着老顶强度的增大先迅速增大为89.34MPa,当老顶强度超过40GPa后,应力峰值基本保持不变.当工作面由断层下盘向断层推进时冲击危险性均比工作面由上盘向断层推进时的高.
FLAC5.02D numerical simulation software was used to simulate the influence of the fault on the pressure distribution in coal mining process.The variation of bearing pressure peak at different working face was studied under different fault dip, fault strength, fault drop, roof thickness and old roof strength. The results show that the working face is advanced from the upper fault to the fault: the peak value of supporting pressure decreases with the decrease of fault dip. When the fault dip is 30 °, the peak stress decreases to 60.92 MPa, even less than 63.18 MPa without fault ; When the thickness of the old roof exceeds 20m, the stress peak rapidly decreases to 51.53MPa. While the working face is advanced from the lower fault to the fault: the peak value of stress rapidly increases to 89.34MPa with the increase of the old roof strength, After 40GPa, the stress peak value remains unchanged, and the impact risk is higher when the working face is advanced from the lower fault to the fault than when the working face is advanced from the upper fault to the fault.