摘要
为了解吸附作用对原煤渗透特性的影响,利用自制的煤岩三轴渗透仪,在不同轴压和围压组合条件下,对以打通一矿低渗透突出煤层的原煤试样,采用稳态渗流法进行CO2和N2渗流试验。从渗流力学的观点,分析不同吸附性气体对原煤渗透率的影响。试验结果表明:气体吸附作用越强,气体吸附量越多,则煤样渗透率越低;气体吸附性越强,煤样受围压影响越小,煤样对气体吸附量增加幅度越大;气体压力与原煤渗透率呈乘幂函数关系。同时,给出了吸附膨胀应力与渗透率的关系表达式。研究结果对探索煤层真实的瓦斯运移规律具有一定的参考价值。
For knowing effect of sorption on gas seepage of outburst coal by self-developed triaxial seepage test system.an experimental study of methane air flow in outburst samples,prouced by Datong coal field,is a performed with self-developed triaxial load system and by way of steady-state flow under different confining pressures.Effect of the different sorption of air on air seepage of outburst coal.It is proved by experiments and numerical simulation that：air seepage velocity of outburst coal samples increases with the increase of gas pressure under fixed axial and confining pressures,strong absorption of gases obey the parabolic equation,weakly adsorbed gas exponential equation;Adsorption is stronger and the gas adsorption is more,the lower the permeability of coal;The more absorption,coal effect by confining pressure the smaller the amount of coal to increase its absorption rate of the smaller;Gas pressure and permeability of coal was a power function.The results of the real seam gas exploration migration law has some reference value,coal seam gas injection for the foundation.
出处
《中国矿业》
北大核心
2012年第3期92-95,110,共5页
China Mining Magazine
关键词
突出原煤
吸附作用
渗透速度
渗透率
吸附量
outburst coal
sorption
penetration rate
permeability
adsorption
