薄煤层群煤与瓦斯共采技术研究

Research on Simultaneous Extraction Technology for Coal and Gas of Thin Seam Group

七台河矿区具有煤层薄、透气性差、煤的坚固性系数小、瓦斯含量高、吸附性强、瓦斯涌出初速度衰减快等特点,同时矿区煤层群具有分组性,各组内煤层间距较小。为解决煤层顺层钻孔施工难度大、瓦斯抽放效果差,以及回采工作面上隅角和回风流中瓦斯浓度容易超限等难题,提出沿空留巷邻近层瓦斯抽采技术,构建了七台河矿区薄煤层群煤与瓦斯共采技术体系,并在七台河桃山矿进行了应用研究。应用结果表明,该技术能够实现煤与瓦斯安全高效共采。

Qitaihe Mining Area is characteristics of thin coal seams,low permeability for gas,low hardness coefficient of coal,high gas content,strong adsorbability and quick attenuation of the initial velocity of gas emission.In addition,the coal seams in this mining area have the character of subgroups and the interval between each group of seams is small.In this paper,the gob-side entry retaining for gas extraction from adjacent seams was put forward and the system for simultaneous extraction of coal and gas of thin seams in Qitaihe Mining Area was built in order to solve the difficult technical problems including the difficult drilling construction along seams,the poor gas drainage effect,and the disallowed gas concentration at the upper corner angle of the working face and in the return air.The application research on this technology was conducted in Taoshan Mine in this mining area.The extraction results indicated that the use of this technology could achieve the high-efficiency simultaneous extraction of coal and gas.