Effect of sorption on gas seepage of outburst coal

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.