单一高瓦斯低透气煤层采空区瓦斯抽放技术

分析了单一煤层高瓦斯低透气性煤层采空区瓦斯涌出量较其它煤层的特殊性,强调了此类煤层采空区瓦斯抽放的必要性。通过张集煤矿工作面现场实践,对采空区上向钻孔法的孔距、孔深、钻孔角度以及钻场留设等相关参数进行了详细研究,实践效果证明,此类煤层采空区采用上向钻孔法瓦斯抽放技术能从根本上解决采煤工作面上隅角瓦斯超限问题。

Gas Drainage Technology of Goaf for Low Permeability and High Gassy Single Coal Seam

This paper analyzes the particularity of gas emission for the low permeability and high gassy single coal seam and others,emphasizes the necessity of gas drainage for this kind coal seam's goaf.By field practice in Zhangji Coal Mine,detailedly studies the parameters of hole distance,hole depth,drilling angle and drilling field design of the upward hole-drilling method,the field practice shows that upward hole-drilling method can fundamentally solve the gas concentration exceeding limits problem in upper cor...