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根据相邻煤层钻孔瓦斯抽采流量与时间的观测数据,计算了贺西煤矿3号和4号煤层钻孔瓦斯初始流量、衰减系数、煤层透气性系数。研究表明3号煤层卸压保护开采,使4号煤层钻孔瓦斯初始流量和极限抽采量小于3号煤层,而衰减系数和煤层透气性系数却大于3号煤层;影响钻孔瓦斯流量和浓度主要因素是封孔质量。因此,建议延长3号煤层抽采时间,加大4号煤层孔间距,提高封孔质量以提高各煤层综合抽采效果。
According to the observed data of flow rate and time of gas drainage in adjacent coal seams, the initial gas flow rate, attenuation coefficient and permeability coefficient of coal seam in Hexi Coal Mine No.3 and No.4 coal seam are calculated. The research shows that the pressure relief and protection mining of No. 3 coal seam causes the initial flow rate and ultimate extraction volume of No.4 coal seam gas to be less than No. 3 coal seam while the attenuation coefficient and permeability coefficient of coal seam are greater than that of No. 3 coal seam; The main factor is the sealing quality. Therefore, it is suggested to extend the pumping time of No.3 coal seam, increase the hole spacing of No.4 coal seam, and improve the quality of sealing holes so as to improve the comprehensive pumping effect of each coal seam.