抽放条件下采空区煤自燃危险区域判定

Dangerous Area Determination of Coal Spontaneous Combustion in Goaf Under the Condion of Gas Drainage

瓦斯抽放不仅会增大采空区漏风,引起"三带"迁移,加大采空区煤自燃危险性;而且会造成采空区的紊乱及瓦斯积聚,致使采空区遗煤自燃危险区域更加复杂。针对建北矿4204工作面高瓦斯赋存实际情况,通过现场观测,得出采空区浮煤厚度、氧浓度和漏风强度的分布规律,并结合煤自然发火特性参数对采空区进行危险性分析,划分了抽采条件下采空区"三带"范围,确定了采空区自燃危险区域及预防采空区遗煤自燃的工作面安全推进速度。

Gas drainage will not only increase air leakage in the goaf, cause the migration of ＂three zones＂, increase the risk of spontaneous combustion of coal in goaf, but also cause the disorder of goaf and accumulation of gas, which makes the danger area of coal spontaneous combustion in goaf more complicated. Aiming at the actual situation of high gas occurrence in 4204 working face of Jianbei Mine, through on-site observation, the distribution of floating coal thickness, oxygen concentration and air leakage strength in goaf are obtained. Combined with the characteristic parameters of coal spontaneous combustion, we analyzed the risk of goaf, divided the goaf＂three zones＂under the condition of extraction and determined the goaf spontaneous combustion danger area and safe advance speed of preventing of spontaneous combustion in goaf.