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通过对大倾角煤层顶板的破断情况进行力学分析,建立UDEC二维模型,分析不同煤层倾角条件下上覆岩层的运移规律。结果表明:大倾角工作面上部区域顶板比下部更易断裂,且倾角越大现象越明显。受直接顶矸石滑落影响,工作面下部区域基本顶有矸石支撑,采空区上部区域易形成空顶,促进了采空区上端头基本顶的断裂垮落。上覆岩层下沉量随岩层倾角增大而逐渐减小,在煤层倾角大于40°后发生突变,上覆岩层下沉曲线由“V”形变为“U”形,采空区中部区域上覆岩层下沉量迅速减小。
Through the mechanical analysis of the roof breakage in the high angle coal seam, a UDEC two-dimensional model is established and the law of overlying strata migration under different coal seam dip angles is analyzed. The results show that the roof in the upper part of the steep working face is more prone to fracture than the lower part, and the more the inclination is, the more obvious the phenomenon is. Due to the influence of direct top gangue slip, gangue support is basically at the bottom of the working face and the top of the goaf tends to form a hollow top, which promotes the fracture and collapse of the basic top head in the goaf. The subsidence of the overlying strata decreases gradually with the dip of the strata. When the dip of the coal seam is more than 40 °, the subsidence changes. The overlying strata sinks from “V” to “U” The amount of subsidence in overlying strata in the central region decreased rapidly.