采空区顶板高位定向钻孔抽采技术研究

Study on Directional Drilling Extration Technology in High Position for Roof in Goaf

为解决上隅角瓦斯超限问题,利用定向钻进技术轨迹可控、覆盖区域广等优越性,布置顶板高位定向钻孔抽采采空区瓦斯;通过数值模拟寺河矿E5302工作面工作面顶板破坏规律,得到距回风侧75 m范围内不同位置张拉破坏高度关系式,确定采空区顶板高位定向钻孔布置层位为距顶板垂直距离30~45 m;结合现场试验,回采期间上隅角瓦斯浓度控制在0.4%左右,保障了回采期间安全。

In order to solve the over limit of gas in the upper corner, using directional drilling technology which has the characteristics of controllable track, wide coverage area and so on, gas extraction is carried out by roof high position directional drilling in goaf. The roof failure law of E5302 face in Sihe Mine is numerically simulated, and the relationship between tension and failure height at different locations in the 75 m range from the return air side is obtained. It is determined that the top orientation of the gob area is located at the vertical distance from the roof, and the vertical distance is 30 m to 45 m. In the field test, the gas concentration in the upper corner is controlled around 0.4% during the recovery period, which ensures the safety during the recovery period.