可解吸瓦斯含量降低法在顺层钻孔瓦斯抽采半径考察中的应用

对于突出煤层,准确掌握其瓦斯抽采半径是制订防突措施的重要依据,也是在预抽期内实现消突的根本保证。采用可解吸瓦斯含量降低法,对狗场煤矿5102备采工作面5号煤层Φ75 mm顺层钻孔进行了抽采半径考察。实践证明,可解吸瓦斯含量降低法可以用于顺层钻孔抽采半径考察,其成功率及准确性较高。考察结果表明,狗场煤矿5号煤层Φ75 mm顺层钻孔抽采半径R与预抽时间t之间的相关关系式为R=0.666 ln t-1.422。

Application of Reduction Method for Desorption Gas Content in Investigation of Gas Drainage Radius by Boreholes along Seam

The accurate knowledge of the gas drainage radius in an outburst seam is not only an important basis for working out outburst prevention measures,but also the fundamental guarantee for the realization of outburst elimination in the pre-drainage period.In this paper,investigation was made on the gas drainage radius of Φ75 mm borehole along No.5 seam of 5102 working face in Gouchang Coal Mine by applying the reduction method for desorption gas content.The practice proved that the reduction method for desorption gas content can be used for the investigation on the drainage radius of the boreholes along the seam and it has higher success rate and accuracy.The investigation results showed that the relation between the drainage radius R of Φ75 mm borehole along No.5 seam in this mine and the gas pre-drainage time t was R=0.666ln t-1.422.