石炭系小煤柱掘进工作面巷道及相邻采空区防灭火技术

塔山矿试行小煤柱沿空开采,但工作面间小煤柱存在裂隙,致使在采工作面与毗邻采空区发生一定程度的气体交换,采空区内进入氧气,导致工作面出现自燃的可能性增加,以3-5#层8204工作面为研究对象,相邻采空区氧化带浓度明显呈现出"耳状"分布,通过对现场实际测试和数值模拟氧化带取得了深度的最大值29.6 m,长度在这一时期实现了较大的延伸。依据氧化带分布特征确定注氮步距,根据氧化带遗煤量确定注氮量,达到防灭火目的。

Fire Prevention and Extinguishing Technology in Roadway and Adjacent Goaf of Carboniferous Small Coal Pillar Driving Face

Tashan mine has tried out gob-side mining with small pillars, but there are cracks in small pillars between working faces, which results in gas exchange between working faces and adjacent goaf to a certain extent, and oxygen entering the goaf, which increases the possibility of spontaneous combustion in working faces. 8204 working face of 3-5#seam is taken as the research object. The concentration of oxidation zone in adjacent goaf obviously presents "ear" distribution. The maximum depth of oxidation zone is 29.6 m through field test and numerical simulation, and the length of oxidation zone has been extended greatly in this period. The step distance of nitrogen injection is determined according to the distribution characteristics of oxidation zone, and the amount of nitrogen injection is determined according to the amount of coal left in oxidation zone, so as to achieve the purpose of fire prevention and extinguishing.