泄排巷对采空区瓦斯分布影响的数值模拟

为了考察泄排巷对采空区瓦斯分布的影响,运用滤流理论建立了采空区瓦斯运移数学模型,模拟研究了无瓦斯泄排巷、有1条泄排巷和2条泄排巷,以及泄排巷位置发生变化时采场瓦斯分布特性。结果表明,泄排巷数目和位置对采空区瓦斯分布有重要影响,其作用相当于漏风汇,能分流采空区瓦斯,从而降低工作面上隅角、回风流及采空区瓦斯浓度,并且泄排巷离回风巷越近,分流瓦斯的效果越好。泄排巷对采空区瓦斯分布的影响上层比下层更大。

Numeric Simulation of Goaf Gas Distribution Influenced by Drainage Gas Lane

In order to investigate the influence imposed by drainage gas lane to goaf gas distribuuion,mathematical model of gas migration in goaf was established basing on filtration theory.Stope gas distribution characteristics was studied through simulation,by contrast with without gasses drainage gas lane,one drainage lane and two drainage lane,as well as when the position of gas drainage lane varies.The consequence indicates gas drainage lane's number and position has important influence on goaf gas distribution,and it behaves as air leak congruence,which is capable of diffluencing goaf gas,with the result that degrades gas concentration of working face upper spatial angle,return air and goaf.In addition,the better effect getting is diffluence gas,the closer is the distance from drainage gas lane to return airway.The influence imposed by drainage lane to goaf gas distribution is much larger in goaf's top layer than in underlayer.