开采煤层顶板抽放瓦斯流场分析

Analysis of Flow Field of Gas Drained from Roof of Working Seams

论述了沿开采煤层顶板走向布置钻孔或巷道抽放瓦斯的基本原理及煤层顶板覆岩采动裂隙分布特征。应用流场理论分析了实施顶板抽放瓦斯技术前后采煤工作面上隅角和采空区 -顶板裂隙 -顶板抽放钻孔或巷道三维区域内的瓦斯流场分布。指出了应用顶板抽放瓦斯技术应注意的关键问题。

The paper described the basic principle of gas drainage form boreholes or roadways arranged along roof strike of the working seams and the distribution characteristics of roof rock fractures,analyzed the distribution of gas folw field in the three-dimensional area of the upper corner angle and the goaf of coal face-roof fractures-drainage holes or roadways in the roof before and after practicing gas drainage techniques from roof with flow field theory,and pointed out some key problems need pay attention to in the application of gas drainage techniques from roof。