高瓦斯易自燃综放工作面高位瓦斯抽放钻孔位置优选研究

Preference on location of high-level gas drainage drilling on fully-mechanized caving mining face in high-gas and spontaneous combustion seam

针对大佛寺矿401采区厚煤层高瓦斯易自燃特点,在40106综放工作面进行了瓦斯治理实践,采用马丽散有效封堵钻孔渗水,并对不同层位钻孔瓦斯抽放效果进行比较分析,结果表明,采后高位卸压钻孔终孔布置在裂隙带,即煤层顶板以上17 m处时抽放浓度高且稳定。

Aiming at the characteristics of high gas and spontaneous combustion thick seam in No.401 working area of Dafosi Coal Mine,the corresponding gas control was carried out on No.40106 working face.Malisan was used to seal borehole to avoid water penetration and the gas drainage effects at the different levels were analyzed.The results showed that the gas drainage concentration was high and consistent when the bottom of high-level borehole was located in the fissure zone,namely 17 m above the roof.