高压水射流割缝提高瓦斯抽放效率的研究

Research on High Pressure Water Jet Cutting to Improve Gas Drainage Efficiency

为了提高坚硬煤层的瓦斯抽放效率,利用高压水射流对瓦斯抽放钻孔进行割缝。采用计算机模拟优化影响高压水射流切割质量的各种参数,研究了高压水射流割缝提高瓦斯抽放效率的作用机理,并进行了井下高压水射流割缝工业性试验。试验结果表明:高压水射流割缝改变了煤体的原始应力和裂隙状况,改善了煤层中的瓦斯流动状态,瓦斯抽放量提高了5~6倍,瓦斯抽放速率提高了6~8倍,从而提高了煤层瓦斯抽放效率。

In order to improve the gas drainage efficiency of the hard coal seam,the high pressure water jet was applied to make cutting fissures on the gas drainage boreholes.The computer simulation was applied to optimize different parameters influenced to the high pressure water jet cutting quality.The paper had a research on the function mechanism of the high pressure water jet cutting fissures to improve the gas drainage efficiency.An industrial trial on the high pressure water jet cutting fissures was conducted ...