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以某矿多煤层下保护层急倾斜俯伪斜工作面为例,确定了沿工作面伪斜方向顶板硬岩层承受的载荷和充填体的支撑载荷的表达式.基于关键层理论和有限元数值模拟方法,确定了下保护煤层开采后上覆岩层中的关键层的位置及其破断距;得出了急倾斜煤层开采后受关键层影响下的上覆岩层移动特点和破坏形态;分析了关键层对保护层开采保护范围的影响.研究表明,距下保护层K6煤层17 m的硅质石灰岩为上覆岩层中的关键层,其破断距为30 m左右;关键层破断之前,关键层上部的被保护层卸压并不明显;关键层破断以后,保护层的保护作用逐渐明显;且被保护层的瓦斯涌出规律与关键层破断距成周期变化,倾斜上部瓦斯得到充分释放,而倾斜下部由于冒落矸石的充填导致岩层变形较小,瓦斯不能充分释放,使保护范围在倾向上部比下部大.
Taking the inclined steep inclined inclined face in the coal seam under the coal seam as an example, the expression of the load on the hard rock layer and the supporting load of the filling body along the pseudo-inclined roof along the working face is determined. Based on the theory of key layers and the finite element value Simulation method to determine the position and breaking distance of the key strata in the overlying strata after the mining of the lower protective coal seam. The movement characteristics and failure modes of the overlying strata under the influence of the key strata after the mining of the steep coal seam are obtained. The key The study shows that siliceous limestone, 17 m away from the protective layer K6, is the key layer in overlying strata, and the breaking distance is about 30 m. Before the key layer is broken, the upper part of the key strata Of the protected layer is not obvious relief; after the key layer is broken, the protective effect of the protective layer becomes obvious gradually; and the gas emission law of the protected layer changes periodically with the breaking of the key layer, the upper inclined gas is fully released and the inclined The lower part of the rock formation is less deformed due to the filling of fallen gangue and the gas can not be fully released so that the protection range tends to be larger in the upper part than in the lower part.