基于瓦斯含量的顺层孔抽采半径测定

Drainage Radius Measurement in Bedding Borehole Based on Gas Content

在谢桥矿6煤层,提出了基于测定煤体瓦斯含量的瓦斯有效抽采半径测定方法。该方法分析抽采前原始瓦斯含量与抽采后的残余瓦斯含量,参考《防治煤与瓦斯突出规定》,确定钻孔的有效抽采半径。实践证明,在谢桥矿6煤层瓦斯含量法测定钻孔抽采半径可行。考察结果表明,抽采后钻孔的残余瓦斯含量低于4.6 m^3/t,可以认为这个钻孔位于有效抽采半径内。

On the basis of measuring the gas content,a method was worked out for determing the gas extraction effective radius at the xieqiao sixth coal seam. The method analyzes the primitive gas content before gas extraction and residual gas content after gas extraction, according to Regulations for Preventing Coal and Gas Outburst, to determine effective extraction radius of holes. The pretice showed that it is feasible to use the gas content method to determine the gas drainage radius of holes at he Xieqiao sixth coal seam. The result indicates that： the concentration of the residual gas content is lower than 4.6 mb/t. That means this hole is positioned within the effective extraction radius.