摘要:
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。
Abstract:
With the research technique of the compressive stress experiment in laboratory,theoretical analysis and the field measurement,taking the actual production of large mining height working face in Hedong coal mine as background,the spalling mechanism in working face of large mining height tonstein coal seam has been studied.The research indicated that the single axle compressive strength of non-coupling superposition specimens is larger than the pure coal sample intensity without tonstein,and the deformation amount is smaller than pure coal sample.The theory analysis of the coal wall spalling model indicated that the main influencing factors for the coal wall stability is the coal seam whole height,under the same external force condition,more higher of the coal seam height is,more easier of the coal wall instability is,the tonstein layers reduce the overall thickness of coal seam effectively,the spalling degree of the working face is obviously small.The rib spalling phenomenon of the tonstein coal seam mainly occured in the upside position of the 10# coal seam in Hedong coal mine,the rib spalling area is not big,and the influence degree is also small.
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