基于初始释放瓦斯膨胀能测定极限抽放半径技术研究

Study on the technique for determination of the ultimate drainage radius based on the initial releasing gas expansion energy

为解决高瓦斯突出煤层预抽煤层瓦斯过程中存在抽放钻孔设计不合理易导致突出危险性未能消除的问题,通过对初始释放瓦斯膨胀能和瓦斯压力、瓦斯含量关系的分析,提出了基于初始释放瓦斯膨胀能测定钻孔极限抽放半径的新技术,并在高河煤矿进行了现场应用。结果表明基于初始释放瓦斯膨胀能测定钻孔极限抽放半径是一种简单有效的方法,高河煤矿3~#煤层北翼西回风巷极限抽放时间为150 d,极限抽放半径为1.5 m。

To solve the problem that the unreasonable design of the gas drainage hole is prone to causing the gas outburst in the process of gas pre-drainage in the high and outburst coal seam. The relations between the initially releasing gas expansion energy, gas pressure and gas content were analyzed. A new technique for the determination of the ultimate gas drainage radius was put forward based on the initially releasing gas expansion energy and carried out in Gaohe Coal Mine. The results show that this technique is simple and effective, and the ultimate gas drainage time is 150 d and the maximum drainage radius is 1.5 m for west air return roadway of north wing of No. 3 coal seam in Gaohe Coal Mine.