高位钻孔抽采治理瓦斯技术研究

Research on Gas Drainage Technique by High-level Drilling

为解决唐山矿工作面在回采过程中瓦斯浓度超限问题,在Y484工作面现场试验高位钻孔进行瓦斯抽放。根据分源瓦斯预测方法对工作面瓦斯涌出源进行分析,并通过理论计算冒落带和裂隙带的高度范围。结合本煤矿的现场实际情况,基于原经验优化高位钻孔参数布置,并对抽放效果进行研究。研究结果表明:工作面距离钻场越来越近时,瓦斯抽采量不断增高;通过计算瓦斯抽采纯量得到抽采效果较好孔的位置为孔高35～50 m,距巷帮距离30～50 m,瓦斯抽采率大大提高,工作面及上隅角瓦斯可得到有效控制。

To solve the problem of excessive gas concentration in the mining face of Tangshan mine,field test was carried out to gas drainage by high-level drilling in Y484 working face.The gas emission sources in working face were analyzed using different sources prediction method,and the height range of caving zone and fracture zone is calculated theoretically.Combined with the actual situation of this coal mine,borehole parameters are arranged based on original experience and the effect of gas-drainage are studied.The result showed that as the working face is getting closer to the drilling ground,the amount of gas drainage is increasing.The position of the hole with better extraction effect is obtained by calculating the pure amount of gas extraction,the hole height is 35 to 50 m,and the distance from the top of the roadway is 30 to 50 m.The gas drainage rate is greatly improved,and the gas and upper corner angle can be effectively controlled in the working face.