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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。
This paper analyzes the particularity of gas emission in the gob of high gas and low permeability coal seam in a single coal seam compared with other coal seams and emphasizes the necessity of gas drainage in the gob of such coal seam. Based on the field practice of coalface in Zhangji Coal Mine, the relevant parameters such as the hole distance, hole depth, drilling angle and the setting of drilling field in goaf drilling are studied in detail. The practical results show that the coal mined In the area, gas drainage through upward drilling can fundamentally solve the gas overrun problem in the upper corner of coal mining face.