高位钻孔瓦斯抽放参数的确定

Determination of high-level borehole gas drainage parameters

为防治煤矿瓦斯灾害和有效开采瓦斯资源,基于高位钻孔瓦斯抽放理论,在分析采空区顶板覆岩空间垮落规律及采动裂隙"O"形圈理论基础上,给出了钻孔有效高度范围的理论计算方法及钻孔沿倾向的布置范围,得出了钻场间距应小于实际施工的钻孔长度与钻孔重叠区之差的结论。在现场应用中取得了良好的技术与经济效果。

This paper is an effort to give insight into the theory of high-level borehole gas drainage in order to achieve dual purposes of preventing coal-mine gas disasters and exploiting the gas resources effectively. Based on the analysis of the rules governing collapse of goaf roof in the overlying strata spatial structure and the O-shape circle theory of mining-induced fractures, the paper presents the theoretical calculation method of borehole effective-height scope and the arrangement scopes of boreholes along the tendency. It follows that the drilling-field spacing should be less than the difference between the borehole length in practical construction and the borehole overlapping area. The field application yields great technological and economic effect.