论文部分内容阅读
为了探讨高应力区“三软”煤层上保护层开采底板围岩透气性演化规律,以河南平顶山四矿己_(15)-23130工作面作上保护层煤层开采为研究对象,进行相似试验研究。结果表明,距保护层越近,底板位移量越大,应力曲线峰值越高,极小值越小,透气性系数提升越显著;底板透气性系数在上保护层开采过程中依次经历“缓慢下降-大幅提高-再次缓慢降低”3个阶段,同一层位不同水平位置底板透气性系数提高程度差别不大;上保护层开采过程中底板压力陡变卸压是导致工作面瓦斯异常涌出的重要原因。
In order to investigate the evolution law of the permeability of the surrounding rock in the floor of protective layer mining in the high stress area and the “three soft” seam, taking the mining of protective layer in the No.4 Mine of Pingdingshan in Henan Province as the research object, Experimental Research. The results show that the closer to the protective layer, the larger the displacement of the bottom plate is, the higher the peak value of the stress curve is. The smaller the minimum value is, the more obvious the air permeability is. The coefficient of permeability of the bottom plate goes through “slow Decreased - sharply increased - once again slow down ”three stages, the same level at different levels of bottom floor air permeability coefficient difference is not very different; upper protective layer during the mining floor pressure steep pressure relief is caused by the abnormal gushing gas in the face important reason.