石港矿15109综放工作面初采期瓦斯涌出特征分析

Gas Emission Feature Analysis in No.15109 Fully Mechanized Caving Face of Shigang Coal Mine During Initial Mining Period

石港矿综放工作面瓦斯涌出量巨大,初采期的瓦斯超限问题威胁着该矿安全生产。通过对15109综放工作面初采期瓦斯涌出特征的分析,得出初采期瓦斯涌出波动性较大主要是上覆煤岩层的活动引起的,直接顶和老顶的垮落相继引起邻近层瓦斯的大量涌出,得出初采期风排瓦斯量、高抽巷抽放瓦斯量以及尾巷瓦斯浓度的变化规律,尾巷瓦斯超限距离为4.5～27.8 m,石港矿15109工作面初采期的瓦斯涌出特征适于该矿一采区的其他大采长工作面,并对上覆煤岩层相同的其他采区工作面的初采期瓦斯治理提供了重要参数。

Gas emission was huge in fully mechanized caving face of Shigang Coal Mine,the problem of gas concentration exceeding limits threatened the safety production of this mine in initial mining period.Through analyzing the gas emission features in No.15109 fully mechanized caving face during initial mining period,it obtained that gas emission had a larger fluctuation in initial mining period,which was mainly caused by the activities of overlying coal and rock seams.Collapse of the direct roof and main roof led to a large number of gas emission of the adjacent seam in succession,it obtained the change law of ventilation gas volume,pumping gas volume of high level suction roadway and gas concentration of tail roadway in initial mining period.Gas concentration exceeding limits distance of tail roadway was 4.5～27.8 m.The gas emission features of No.15109 working face in Shigang Coal Mine in initial mining period also applied for other fully mechanized caving faces in the first mining area,and provided important parameters for the gas control in the initial mining period of working faces in other mining areas with the same overlying coal and rock seams.