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针对低透气性松软煤层中瓦斯抽放效率低的问题,采用高压水射流技术在煤层中进行了增加煤层透气性的实验。实验采用在钻场瓦斯抽放钻孔中进行高压水射流割缝的措施,把煤体割缝破碎后,进行封孔抽放。实验结果表明这个措施能有效提高瓦斯抽放效率,提高煤层的透气性,使抽放后煤体残存瓦斯量降得更低,也减少了瓦斯灾害事故的发生概率
In view of the problem of low gas drainage efficiency in the coal seam with low permeability, high pressure water jet technology was used to increase the permeability of the coal seam in the coal seam. The experiment adopts the measure of high-pressure water jet cutting in gas drainage drill hole in drilling site, and after the coal seam is cracked, the hole drainage is sealed. The experimental results show that this measure can effectively improve the gas drainage efficiency and improve the permeability of the coal seam, so as to lower the residual coal gas content after gas drainage and reduce the occurrence probability of gas disasters