采空区漏风流场相似材料模拟研究

Research on similar material simulation of air-leakage flow field in gob

为研究抽放采空区瓦斯对采空区内部流场的影响,基于采空区渗流理论,建立相似材料模型。用该模型模拟未采取瓦斯抽放措施,埋管抽放,瓦斯尾巷抽放,高抽巷抽放4种条件下采空区流场分布状态,结合采空区瓦斯治理与自然发火的耦合关系,探讨采取抽放措施对遗煤自燃的影响,确定影响区域。结果表明,埋管抽放、瓦斯尾巷抽放与高抽巷抽放3种措施都会增大采空区漏风,加大采空区自然发火的危险性和治理难度,在采取抽放措施时应特别注意高抽巷抽放口位置。

In order to research the flow field in the gob after the gas drainage measures were adopted,a similar material model was established according to similar material simulation theory. Flow field distributions in gob under different conditions were simulated. Effects of drainage measures on residual coal spontaneous combustion were studied. The results show that the buried pipes,gas tail roadway and highly-located drainage roadway can expand air-leakage in gob,increase the risk of gob spontaneous combustion,and make the risk management more difficult,and that the opening position of highly-located drainage roadway should be paid special attention for the gas drainage.