新景矿15123底抽巷瓦斯抽采效果研究

Study on gas extraction effect of 15123 bottom drainage roadway in Xinjing Mine

为考察新景矿15123底抽巷钻孔的瓦斯抽采效果,通过现场测试和数值模拟分析,对钻孔抽采前后,钻孔瓦斯抽采量及有效抽采半径进行了研究。研究结果表明,钻孔连抽40 d后,钻孔有效抽采半径可达0.7 m,连抽70 d后,钻孔有效抽采半径可达1.2 m,预计连抽150 d,钻孔有效抽采半径可达3 m左右,在此基础上,对钻孔布孔方式进行优化。

In order to investigate the gas extraction effect of 15123 bottom drainage roadway in Xinjing Mine,through field test and numerical simulation analysis,the gas extraction amount and effective extraction radius of borehole before and after drainage were studied.The results show that the effective extraction radius of the borehole can reach 0.7 m after 40 days of continuous extraction,and the effective extraction radius of the borehole can reach 1.2 m after 70 days of continuous extraction.It is estimated that the effective extraction radius of the borehole can reach about 3 m after 150 days of continuous extraction.On this basis,the borehole layout is optimized.