摘要
为了准确测定霍尔辛赫煤矿3308工作面煤层钻孔有效抽采半径,合理布置钻孔间距,结合现场实测的煤层瓦斯压力和渗透率等参数,运用COMSOL-Multiphysics仿真软件对3308工作面钻孔的瓦斯涌出规律和有效抽采半径进行了模拟分析,并进行了现场实测验证。结果表明:有效抽采半径随着抽采时间的推进不断增大并最终趋于恒定值,整体呈正指数函数关系;瓦斯预抽率随着与钻孔距离的增加而不断减小并最终趋于恒定值,整体呈负指数函数关系;数值模拟和现场实测结果较为一致,钻孔有效抽采半径略大于1.5 m,现场每间隔3.0 m布置1个钻孔可大大提高煤层瓦斯抽采效果。
In order to accurately determine the effective extraction radius of coal seam boreholes in 3308 working face of Huoerxinhe Coal Mine and rationally arrange the spacing of boreholes,combined with the measured parameters such as gas pressure and permeability of coal seam,the gas emission law and effective influence radius of boreholes in 3308 working face were simulated and analyzed by COMSOL-Multiphysics simulation software.The field measurement was carried out to verify the results.The results showed that the effective extraction radius increases with the advance of extraction time and tends to a constant value,and the overall relationship is a positive exponential function;the gas pre-drainage rate decreases with the increase of the distance from the borehole and tends to a constant value.The overall relationship of the pre-drainage rate is negative exponential function;the results of numerical simulation and field measurement are in good agreement.The effective extraction radius of boreholes is slightly larger than 1.5 m.The gas extraction effect of coal seam can be greatly improved by arranging a borehole every 3.0 m interval in the field.
作者
贾牛骏
Jia Niujun(Huoerxinhe Coal Co.,Ltd.,Shanxi Coal Import and Export Group,Changzhi 046600,China)
出处
《能源与环保》
2020年第1期15-20,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
关键词
瓦斯钻孔
有效抽采半径
数值模拟
抽采率
gas drilling
effective extraction radius
numerical simulation
extraction rate
