【摘要】 通过数值分析方法及现场工业试验等手段,对钻采近距离极薄保护层上覆煤层渗透率变化规律进行研究,得出钻采极薄下保护层上覆煤岩层渗透率分布特征、被保护煤层渗透变化规律等。研究成果对极薄保护层开采及卸压瓦斯抽采参数优化等具有一定的指导意义。更多还原

【Abstract】 The permeablity change law in the overlaying coal seam while drilling the extra-thin protective coal seam is stidied by the way of numerical simulation and field test,the permeablity distribution characteristics and the permeablity change law in the protected coal seam ect.are obtained.The reseach results have some guide to exta-thin coal seam mining and releasing-gas drainage parameters optimization.更多还原