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为研究塔山矿采空区不同治理方法效果,解决特厚煤层综放面瓦斯涌出量大及回采期间上隅角异常涌出的问题,采用地面立孔、L型钻孔和高抽巷瓦斯抽采技术治理8204综放面采空区瓦斯。通过对工作面采动覆岩影响规律和地面钻孔、高抽巷位置对瓦斯抽采效果的影响进行模拟,确定不同瓦斯治理方式的合理布置参数。在工作面回采过程中,对瓦斯抽采参数进行现场实测。结果表明,高抽巷平均瓦斯抽采体积分数为37%,明显高于L型钻孔的20%,地面钻孔的2.5%;L型钻孔抽采瓦斯纯量最低,平均为7 m~3/min,而地面钻孔为22 m~3/min,高抽巷为33 m~3/min,都达到治理采空区瓦斯的效果。从施工、投资等因素考虑,得出结论:塔山矿区采用地面立孔和高抽巷治理瓦斯效果最好。
In order to study the effect of different treatment methods in the goaf area of Tashan mine and solve the problems of large amount of gas emission at the fully mechanized top coal caving face in super-thick coal seam and abnormal gush at the upper corner during the mining, ground vertical holes, L-shaped boreholes and high- Gas drainage technology control gas in goaf of 8204 fully mechanized caving face. Through the influence of overburden mining on working face and the influence of surface drilling and high pumping lane on gas drainage, the reasonable layout parameters of different gas treatment modes were determined. In the process of face mining, gas extraction parameters measured on the spot. The results show that the average gas drainage volume of high pumping roadway is 37%, which is obviously higher than 20% of L type drilling hole and 2.5% of the ground drilling hole. The L gas drainage has the lowest gas purity, with an average of 7m ~ 3 / min, while the ground drilling is 22 m ~ 3 / min, and the high extraction roadway is 33 m ~ 3 / min, both of which have the effect of controlling the gas in the goaf. From the construction, investment and other factors, concluded: Tashan mining area with vertical holes and high pumping Lane governance gas best.