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为分析煤层硬夹矸对大采高工作面煤壁稳定性的影响,采用室内试验、理论分析及现场实测相结合的方法,提出了煤壁片帮模型与稳定条件,研究了夹矸煤层工作面煤壁片帮机理。研究表明:夹矸或叠加煤样较纯煤试块抗压强度有所提高;纯煤或叠加煤样轴向变形量较夹矸煤样轴向变形有所增大;煤层硬夹矸能有效提高煤壁整体稳定性;煤体高度对煤壁稳定性影响较大,在相同外力条件下,煤体高度越大,煤壁越易失稳;同时考虑到工作面煤体与室内试验煤样损伤、连续度差异,给出了工作面煤体稳定条件。以东曲煤矿夹矸煤层大采高工作面生产实际为工程背景,实测分析表明,东曲煤矿夹矸煤层28202工作面煤壁片帮较为稳定,工作面片帮主要发生在8#煤层上部位置,片帮程度低,对工作面生产影响较小。
In order to analyze the influence of coal gangue on the coal wall stability of large coal mining face, the model and stability conditions of coal wall slab are proposed by means of indoor test, theoretical analysis and field measurement. Surface coal wall to help the mechanism. The results show that the compressive strength of coal gangue or superposed coal samples is higher than that of pure coal samples; the axial deformation of pure coal or superposed coal samples is larger than the axial deformation of gangue coal samples; Improve the overall stability of the coal wall; height of coal has a greater impact on the stability of the coal wall, under the same external force conditions, the greater the height of the coal, the more likely to destabilize the coal wall; taking into account the coal face and laboratory test coal samples Damage, continuous difference, given the stability of coal face conditions. Taking the actual production of large coal mining face with seam gangue in East Qu coal mines, the actual analysis shows that the wall of coal seam of 28202 working face of Tong Qu coal seam in Dong Qu coal mine is relatively stable. The working face sheet gang mainly occurs in the upper part of seam # 8 , A piece of help to a lesser extent, less impact on the production of face.