摘要
我国突出煤层群赋存分布广泛,底板岩巷立体联合抽采是突出煤层群煤巷条带区域瓦斯治理主要方法.为解决立体抽采混源瓦斯溯源难题,以石桥煤矿为工程背景,采用单一控制变量法对4、5、9号煤层群孔抽采进行瓦斯溯源,确定抽采动态条件下4、5、9号煤层14d累计瓦斯来源比例分别为42.38%、1.47%、56.15%;28 d累计瓦斯来源比例分别为43.55%、3.48%、52.97%;38 d累计瓦斯来源比例分别为45.32%、2.14%、52.54%.为验证群孔瓦斯溯源是否可靠,采用单孔测定方法进行煤层群瓦斯溯源考察验证,经验证,4、5、9号煤层累计瓦斯来源比例分别为40.08%、1.94%、57.98%,偏差控制在10%以内,说明综合确定的瓦斯来源比例真实可靠.立体联合抽采,单一控制变量法对类似矿井联合抽采瓦斯计量具有一定借鉴意义.
Abstract
The occurrence and distribution of outburst coal seams in China are widespread,and the roadway stereoscopic joint extraction in floor strata is the main method for gas control in the coal roadway belt area of outburst coal seams.In order to solve the problem of mixed source gas traceability in the stereoscopic extraction,taking Shiqiao Coal Mine as the engineering background,the single control variable method was used to trace the gas source in the group holes of coal seams 4,5,and 9.Under the dynamic conditions of extraction,the cumulative gas source ratios of coal seams 4,5,and 9 for 14 days were determined to be 42.38,1.47,and 56.15%,respectively.The cumulative gas source ratios for 28 days were 43.55,3.48,and 52.97%,and the cumulative gas source ratios for 38 days were 45.32,2.14,and 52.54%,respectively.In order to verify the reliability of the gas traceability ratio in group control,a single hole measurement method was used to investigate and verify the gas traceability of coal seams.After verification,the cumulative gas source ratios of coal seams 4,5,and 9 were 40.08%,1.94%,and 57.98%,respectively.After verification and analysis,the deviation is controlled within 10%,indicating that the comprehensively determined proportion of gas sources is true and reliable,which has certain reference significance for gas measurement in similar mine joint extraction.
维普
万方数据