基于千米钻机的“三软”煤层瓦斯治理技术及应用

摘要

Abutment pressure distributions of overlying coal seam and horizontal zone partitions of gob area were analyzed systematically.Based on the coal mine geological characteristics,＂three dimensional＂ gas comprehensive drainage technique was proposed and applied in the No.51109 working face of Jiaojiazhai Coal Mine,China.The results show that after the gas control technique implemented,the gas drainage ratio of No.51109 coal seam significantly increases to 67.3%,the gas concentration of ventilation air methane（VAM） decreases to 0.3%,and the imbalance factor of gas emission correspondingly decreases from 2.5 to 1.6.The difficult problems of gas over emitted are effectively solved in this coal mine.This shows that the ＂three dimensional＂ gas comprehensive drainage technique is a suitable and effective measure for the gas emission control in this coal mine or the similar coal geological areas.%在系统分析了三软煤层综放开采工作面超前支撑应力及采空区垂直区带划分的基础上,结合煤矿地质特点,提出了基于千米长钻孔技术的＂三位立体＂瓦斯综合治理技术措施,并进行了现场实际应用。研究结果显示：实施该技术措施后,51109工作面煤层瓦斯抽采率显著提高,达67.3%,风排瓦斯浓度降至0.3%,工作面瓦斯涌出不均匀系数由2.5降至1.6,瓦斯频繁超限的难题得到有效的解决,表明＂三位立体＂瓦斯综合抽采技术措施是一种适合该类地质条件的煤矿瓦斯综合治理技术方案。