唐口煤矿综采工作面采空区瓦斯分布数值模拟

Numerical Simulation of Gob Gas Distribution at Mechanized Mining Face in Tangkou Mine

唐口煤矿5304综采工作面瓦斯分布区域异常,影响工作面安全生产。根据导气裂隙带高度和采空区裂隙分布O型圈理论计算采空区瓦斯分布范围,采用FLUENT数值模拟5304采空区瓦斯分布。结果表明:采空区瓦斯分布可分为3个平面特征区:空隙区域Ⅰ、压实区域Ⅱ、上隅角瓦斯积聚区域Ⅲ;导气裂隙带高度为35 m,随着高度的增加,采空区内瓦斯浓度逐渐增大;设置高位抽放钻孔时,应将高位抽放钻孔设置在工作面导气裂隙带1/2高度(17.5 m)以上。

Abnormal gas distribution area at 5304 fully mechanized working face in Tangkou Coal Mine seriously affects production safety. Gob gas distribution range was calculated according to gas fractured zone height and gob fissure O- ring distribution theory.With FLUENT,gob gas distribution of 5304 woking face was simulated. The results show that the gob gas can be divided into three plane feature regions,fractured region I,compaction region II,upper corner gas accumulation area III; the height of gas fractured zone is 36 m. With the increase of height,the methane concentration in the gob increased gradually; high level drainage borehole should be set higher than the half height（ 17. 5 m） of the gas fractured zone.