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采用实验室内试块压力实验、理论分析及现场实测相结合的研究方法,以河东煤矿大采高工作面生产实际为背景,对大采高夹矸煤层工作面片帮作用机理进行分析。研究表明:夹矸及薄煤块不耦合叠加试件单轴抗压强度较不含夹矸的纯煤样强度有所增大,而变形量较纯煤样变形有所减小;煤壁片帮模型理论分析表明,煤层整体高度对煤壁稳定性影响较大,在相同外力条件下,高度越大,煤壁越容易失稳,夹矸层有效减小煤层整体厚度,工作面分层片帮严重程度明显较小;河东煤矿夹矸煤层片帮现象主要发生在10#煤层靠上部位置,片帮面积不大,影响程度较小。
The experimental method of pressure test, theoretical analysis and field measurement are used in this paper. Based on the actual production of large mining height face in Hedong coal mine, the mechanism of the action of chip mining in the face of large mining height coal seam is analyzed. The results show that the uniaxial compressive strength of the uncoupled superposed specimens of gangue and thin coal briquette is higher than that of the pure briquette without briquette, while the deformation is smaller than the pure briquette; Theoretical analysis of the model shows that the overall height of the coal seam greatly affects the stability of the coal wall. Under the same external force conditions, the higher the height, the more prone to destabilize the coal wall. The layers of the coal seam effectively reduce the overall thickness of the coal seam, The severity of ganging is obviously smaller; the phenomenon of gang-gang ganging in Hedong coal mine mainly occurs in the upper part of No. 10 coal seam, the area of gangue is not big, and the influence degree is small.