新元矿9104工作面瓦斯分布规律与治理技术研究

Study on the distribution law and governance technology of the new yuan mine 9104 working surface

为了解决新元矿9104工作面瓦斯超限的问题,以单元法对工作面进行了现场实测,通过建立空间坐标系,继而分析数据后得出采煤过程中释放的瓦斯以及采空区涌入工作面的瓦斯是其主要来源,回风一侧为工作面瓦斯积聚的主要区域,其中上隅角瓦斯在空间方位上,越靠近顺槽顶板和采空区处瓦斯浓度越高;为此在回风巷一侧采用采空区高位钻孔抽采,模拟分析以及现场实测相互验证得出了上隅角瓦斯浓度为0.1%~0.5%,工作面瓦斯浓度都在0.6%以下,抽采率在30%以上,表明了采用高位钻孔进行抽采能够较好地降低工作面以及上隅角瓦斯的浓度,从而确保了其安全性。

In order to solve the problem of gas overrun in 9104 working face of Xinjing Mine,the surface of the working face was measured by the unit method.The space coordinate system was established and the data was analyzed to obtain the gas and gob released during the coal mining process.The gas that flows into the working face is the main source,and the gas concentration on the return air side is about 5 times of the gas concentration on the inlet side.The gas concentration in the upper corner gas is closer to the gas concentration at the top plate and the goaf.For this reason,high-level borehole extraction in the goaf is adopted on the side of the return airway.The simulation analysis and on-site measurement verify that the gas concentration in the upper corner is 0.1%~0.5%,and the gas concentration in the working surface is 0.6.Below%,the extraction rate is above 30%,indicating that the use of high-level drilling for extraction can better reduce the concentration of the working surface and the upper corner gas,thus ensuring its safety.