综采工作面采空区瓦斯运移规律分析

Analysis on laws of gas movement in goaf of fully-mechanized working face

为了解决综采工作面采空区瓦斯隐患和上隅角瓦斯积聚等问题,研究了综采工作面采空区瓦斯运移规律,采用现场实测方法,根据采空区监测点分布,分析了不同推进距离时采空区瓦斯浓度和氧气分布。研究得出,沿走向方向上采空区瓦斯运移区域划分3个区域:CH4稀释区、CH4快速集聚区和CH4缓慢集聚区,瓦斯主要集聚在采空区中部靠回风侧位置;采空区氧气浓度沿中心线呈不对称分布,越靠近工作面,氧气浓度越高。因此,应布置走向瓦斯高抽巷密封插管来治理采空区瓦斯隐患和上隅角瓦斯积聚。研究为煤矿采空区瓦斯治理提供了理论基础。

In order to solve the hidden dangers of gas in the goaf and gas accumulation in the upper corner of the fully-mechanized working face,this paper studied the gas migration law in the goaf of the fully-mechanized working face,adopts on-site measurement methods,and analyzed the distribution of monitoring points in the goaf.The gas concentration and oxygen distribution in the goaf at different advancing distances.The study concluded that the gas migration area in the goaf along the strike direction is divided into three areas:CH4 dilution area,CH4 rapid accumulation area and CH4 slow accumulation area.Gas mainly accumulates in the middle of the goaf near the return air side.The oxygen concentration in the zone is distributed asymmetrically along the center line.The closer to the working surface,the higher the oxygen concentration.Therefore,sealing cannulae should be arranged for high gas drainage roadway to control the hidden danger of gas in the goaf and gas accumulation in the upper corner.The research provides a theoretical basis for gas control in the goaf of coal mine.