工作面卸压区浅孔瓦斯抽放技术研究

Research on Technology of Draining Methane off Shallow Borholes in a Stress-Relaxation Area of Working Face

为提高低透气性、高瓦斯煤层工作面的瓦斯预抽效果,对工作面瓦斯抽放新技术进行了研究.根据矿山压力分布规律和抽放钻孔的隔断控制作用,并利用工作面前方煤体受采动卸压后透气性显著提高这一特性,研究并试验了卸压区浅孔抽放技术,获得了该抽放技术的工艺参数.研究结果表明该抽放技术可行、系统可靠,能有效提高超前排放钻孔瓦斯排放效果、显著降低煤与瓦斯突出危险性,这对解决低透气性煤层在回采工作面生产过程中的瓦斯问题具有实际意义.

In order to enhance the gas drainage effect in a working face with low permeability and high concentration of gas, the new methane drainage technology is studied. According to the underground pressure distribution rule and the separation control function of drainage borehole, the shallow hole drainage technology is studied and tested by using the characteristic that the gas permeability may have an obvious increase after mining in front of the working face, obtaining some useful parameters, showing that the technology is feasible and credible. So it is significant for methane harnessing in those working faces with low gas permeability.