瓦斯压力对原煤渗透特性的影响

以松藻煤电公司渝阳煤矿8号突出煤层原煤试样为研究对象，利用实验室研制的三轴渗透仪，进行不同轴压围压条件下瓦斯压力对突出原煤渗流特性试验。试验结果表明，瓦斯渗流速度随着瓦斯压力的增加而增加，呈显著的二次多项式函数关系；随着瓦斯压力的增加，突出煤体的渗透率呈现出先减小后增大的趋势，具有明显的Klinkenberg效应；渗透率随瓦斯压力的增加呈“V”字形变化，具有明显的阶段性；随着瓦斯压力的增加，Klinkenberg系数b与绝对渗透率Kg之间呈显著的幂函数关系；瓦斯压力p与渗透率K之间呈显著的二次多项式函数关系。

Effect of gas pressure on gas seepage of outburst coal

Based on No8 coal seam of coal core samples of Yuyang Coal Mine of Songzao Coal and Power Company，the experiment of outburst coal’s gas seepage was carried out under different axial and confining pressures but changeable gas pressure by a self developed three axis penetration device.It is proved by experiments and numerical simulation that the gas seepage velocity of outburst coal samples increases with the increase of gas pressure under fixed axial and confining pressures，and the relationship between gas seepage velocity of outburst coal samples and gas pressure can be described as quadratic polynomial function.The phenomenon that the increase of gas pressure results in the permeability of outburst coal showing a first decrease and then increase known as the Klinkenberg effect.The permeability of outburst coal is “V” shape change with the increase of gas pressure.With the increase in gas pressure,Klinkenberg coefficient b and the absolute permeability Kg can be described as power function relationship.The gas pressure p and the permeability K can be described as quadratic polynomial function.