煤巷动压区瓦斯抽采效果测试及钻孔优化

Effects Test of Gas Extraction and Drilling Optimization in Dynamic Pressure Area of Coal Roadway

在采动应力影响下,含瓦斯煤岩渗流特性的变化会对瓦斯的抽采产生较大影响。从现场实测数据入手,主要侧重于研究布孔方式对瓦斯抽采效果的影响及探讨提高煤巷动压区内瓦斯抽采率的途径和方法。研究结果表明,煤巷两帮卸压条带内,钻孔位置对瓦斯抽采量的影响不仅表现在水平方向上,还表现在垂直方向上(煤层厚度上),进而提出了钻孔布置的设计建议。

The permeability changes of coal and rock have great influences on the drainage of gas under the influence of the mining stress.Based on the measured data from the field,the influences of drillhole layout to gas drainage effects were studied as a main focus,ways and methods of increasing the efficiency of gas drainage in dynamic pressure area of coal roadway were also discussed in the paper.The results show that,in pressure relief stripe of two sides in coal roadway,the influences of drillhole layout to gas drainage effects are not only in the horizontal direction,but also in the vertical direction(seam thickness).Design recommendations of drillholes layout were also put forward.