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介绍了水力冲孔的原理及方法,在张集矿北区17216底抽巷水力冲孔的现场试验的基础上,考察了水力冲孔前后瓦斯压力的变化,以及抽采率和抽放浓度的变化。研究表明,突出煤层中应用水力冲孔技术,可以很好地释放煤层地应力,增加煤层透气性,提高瓦斯抽放率,有效防止煤与瓦斯突出。
The principle and method of hydraulic punching are introduced. Based on the field test of hydraulic punching at the bottom of 17216 pumping tunnel in the north of Zhangji Coal Mine, the changes of gas pressure before and after hydraulic punching are investigated, as well as the extraction rate and drainage concentration Variety. The research shows that the application of hydraulic punching technology in the outburst coal seam can release the ground stress of the coal seam well, increase the gas permeability of the coal seam, increase the gas drainage rate and effectively prevent the coal and gas outburst.