摘要
为了解决寺河矿5309工作面上隅角瓦斯超限的问题,采用顶板走向长钻孔抽采瓦斯的方式进行瓦斯治理,运用FLUENT软件模拟分析布置于平行回风巷且孔间距为10 m的顶板走向长钻孔束在不同参数条件下的瓦斯抽采效果。研究结果表明:随着顶板走向长钻孔束与底板垂直距离的增加,钻孔抽采瓦斯纯流量先增大后减小,上隅角瓦斯浓度呈增高的趋势;随着顶板走向长钻孔束与回风巷水平距离的增加,钻孔抽采瓦斯纯流量先增大后减小,上隅角瓦斯浓度呈先降低后增高的趋势。经对比分析确定顶板走向长钻孔束最佳抽采位置距顶板垂直高度为38 m、距回风巷25 m,在此区域内钻孔抽采瓦斯纯流量可达15.03 m^(3)/min,5309工作面上隅角瓦斯浓度降低至0.20%,瓦斯治理效果显著。
In order to solve the problem of gas overrun in the upper corner of the 5309 working face of Sihe Mine,gas control is carried out by means of gas extraction with long boreholes in roof strike.FLUENT software is used to simulate and analyze the gas extraction effect under different parameters of the roof long borehole cluster arranged in the horizontal return airway with hole spacing of 10 m.The result shows that:as the vertical distance between the long borehole bundle and the bottom plate along the roof strike increases,the pure gas flow rate of borehole drainage increases first and then decreases,and the gas concentration in the upper corner shows an increasing trend;with the increase of the horizontal distance between the long borehole bundle and the return airway along the roof strike,the pure gas flow rate of borehole drainage increases first and then decreases,and the gas concentration in the upper corner first decreases and then increases.After comparative analysis,it is determined that the best extraction position of the long borehole bundle with the roof strike is 38 m from the vertical height of the roof and 25 m from the return airway.The pure gas flow rate of the boreholes can reach 15.03 m^(3)/min.The gas concentration in the upper corner of the 5309 working face is reduced to 0.20%and the gas treatment effect is significant.
作者
郝长胜
王浩天
贾廷贵
HAO Changsheng;WANG Haotian;JIA Tingui(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China;Institute of Mining Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《矿业安全与环保》
北大核心
2021年第6期40-46,共7页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(52064043)
国家重点研发计划项目(2017YFC1503100)
内蒙古自治区自然科学基金项目(2020MS05010)。
关键词
覆岩“三带”
采空区
上隅角
瓦斯抽采
顶板走向长钻孔
数值模拟
overlying rock“three zones”
goaf
upper corner
gas extraction
roof strike long borehole
numerical simulation
