论文部分内容阅读
基于淮南矿区高瓦斯低渗透性煤层群赋存条件,通过试验模型分析了卸压开采后的覆岩移动破坏、卸压煤层移动变形、采动裂隙垂向分带和卸压煤层应力分带特征,得出了首采层采空侧顶板至上覆卸压煤层顶板中存在环形裂隙区、竖向裂隙区、远程卸压煤层裂隙区,根据采动裂隙区发育特征,提出了卸压瓦斯抽采地面钻井的部署方法。在顾桥矿1117(1)工作面切眼外侧、风巷内侧和工作面前方分别布置有“”、“│”型和“L”型地面钻井,实现了长时间、大范围、较高的卸压瓦斯抽采率。总结了地面钻井位置、钻井型式、钻井稳定性与卸压瓦斯抽采效果之间的关系。
Based on the occurrence conditions of high gassy and low permeability coal seams in Huainan mining area, the movement and failure of overlying strata after pressure relief mining are analyzed, and the stress and banding characteristics of vertical fractured zone and stress-relief coal seam are analyzed. The conclusion is drawn that there are annular fracture zone, vertical fracture zone and long-distance relief coal seam fracture zone in the roof of the first mining floor with the roof to the overburden seam. According to the development characteristics of the mining fractured zone, Ground drilling method of deployment. In Guqiao 1117 (1) face cut out the outside of the air inside and front of the working face were arranged with “”, “│ ” type and “L ” type of ground drilling, to achieve a long time, Large-scale, high pressure relief pumping rate. Summarizes the relationship between surface drilling location, drilling pattern, drilling stability and relief pumping effect.