井下相邻采空区有害气体防治技术研究

Study on Prevention and Control Technology of Harmful Gas in Underground Adjacent Goaf

针对塔山煤矿特厚煤层小煤柱工作面开采期间由于沿空掘巷导致与相邻采空区出现呼吸现象的问题,提出了利用地面钻孔抽放结合井下注氮,置换采空区高浓度瓦斯气体的解决方案。一方面平衡相邻采空区与小煤柱工作面之间的压差,消除采空区"呼吸"问题;另一方面利用氮气将采空区高浓度瓦斯逐步置换,使采空区内形成低瓦斯含量的混合气体,消除采空区瓦斯、自燃隐患,为小煤柱工作面的安全顺利开采奠定了基础。

During the mining of extra-thick coal seam with small coal pillar in Tashan coal mine, due to the oc-currence of respiration in the goaf along the roadway, the paper puts forward the solution of ground drilling and drain-age combined with underground nitrogen injection, to achieve the displacement of the high gas in goaf. By so, the gap between the adjacent mined-out area and the current mining face is getting balanced, the breathing problem elimina-ted ,on the other hand, the high concentration of methane in the goaf is displaced by nitrogen, risk of spontaneous combustion hazards removed, laid the foundation for safe mining.