摘要
随着我国煤矿开采不断深入,高突煤矿瓦斯灾害日益严重。以某11615工作面为研究对象,采用分源预测法计算瓦斯涌出量,分析工作面瓦斯抽采的可行性,并利用定向钻孔技术对采空区的瓦斯抽采参数进行优化,通过构建裂隙带与椭抛带理论模型,确定了瓦斯富集区域范围。研究结果表明:回采工作面瓦斯涌出量为21.297 m^(3)/t,属于高突煤层,具备充分抽采必要性。通过采用顺层钻孔预抽区域煤层瓦斯和煤巷条带瓦斯,确定了高位定向钻孔中的抽采量达14.094 m^(3)/min,占工作面绝对瓦斯涌出量的29.1%,风排瓦斯量占比降至13.6%,回风巷瓦斯体积分数稳定低于0.8%。明确了钻孔轨迹层位应在距离煤层底板向上15~23 m的采空区环形卸压瓦斯富集区。低负压高位钻孔抽采技术在高突松软煤层条件中具有普适性,显著降低了高突矿井瓦斯灾害风险,满足安全开采要求。研究成果有效保障了矿井安全开采。
With the deepening of coal mining in China,the gas disaster in high outburst coal mine is becoming more and more serious.Therefore,taking a 11615 working face as the research object,the gas emission amount is calculated by using the source prediction method,the feasibility of gas extraction in the working face is analyzed,and the gas extraction parameters in the goaf are optimized by using the directional drilling technology.Based on the theoretical equations of fractured zone and elliptical parabolic zone,the range of gas enrichment area is determined.The results show that the gas emission of the working face is 21.297 m^(3)/t,which belongs to the high outburst coal seam and is necessary for full extraction.The coal seam gas and coal roadway strip gas in the pre-drainage area of the bedding borehole were used to determine that the extraction amount in the high-level directional borehole was 14.094 m^(3)/min,accounting for 29.1%of the absolute gas emission amount of the working face,and the proportion of air exhaust gas was reduced to 13.6%,and the gas concentration in the return airway was stable below 0.8%.It is determined that the borehole trajectory layer should be in the goaf ring pressure relief gas enrichment area of 15~23 m upward from the coal seam floor.The low-negative pressure high-level borehole extraction technology is universal in the conditions of high-burst soft coal seams,which significantly reduces the risk of gas disasters in high-burst mines and meets the requirements of safe mining.
作者
张虎伟
Zhang Huwei(Shaanxi Yanchang Petroleum Mining Co.,Ltd.,Shaanxi,710000)
出处
《当代化工研究》
2025年第8期104-108,共5页
Modern Chemical Research
