阶梯状断层防水煤岩柱体塑性区宽度

Study on the Width of Plastic Zone of Waterproof Coal-Rock Pillar of Stepped Faults

煤系地层中断层带常以阶梯、地堑状等形式出现,为研究阶梯状断层组防水煤岩柱体塑性区宽度,以邯邢矿区邢东煤矿阶梯状断层组为研究对象,基于工作面导水裂隙带发育规律,创新性地提出阶梯状断层梯形防水煤岩柱体稳定性结构力学模型,根据梯形煤岩柱体内局部岩体受力情况及其几何特征,推导出阶梯状断层防水煤岩柱塑性区破坏宽度计算公式,并针对邢东煤矿内F23断层与SF27断层组成的阶梯状断层组,通过理论分析和数值模拟,计算了阶梯状断层防水煤岩柱塑性区宽度,进一步验证了理论分析的正确性.

In coal stratum faults often appear in the form of mantle, stepped, etc. In order to study the width of plastic zone of water proof coal-rock pillar of stepped faults, taking the stepped faults in Xingdong coal mine in Hanxing mining area as the research object, based on the development regularity of the height of fractured water-conducting zone, innovatively proposed mechanical model of stability of trapezoidal waterproof coal-rock pillar of stepped faults. According to the stress and its geometric characteristics of local rock mass in trapezoidal coal-rock column, deduced the formula for calculating the failure width of plastic zone of waterproof coal-rock pillar of stepped faults. The F23 and SF27 stepped faults were studied which in Xingdong coal mine in Hanxing mining area, through theoretical analysis and numerical simulation, the width of the plastic zone of waterproof coal-rock pillar of stepped faults was calculated, further the correctness of the theoretical analysis was verified.