Numerical Simulation Research of Gas Migration Laws on Real Underground Mining Conditions

In order to show gas migration process visually and research gas migration laws at different status when gas gushed from driving working face and then migrated along the roadway, we used FLUENT to research the characters of gas migration when wind velocities were 6m / s, 8m / s, 10m / s, and gas emission speeds were 10m / s, 30m / s and 50m / s on real atmospheric pressure, moisture content, viscosity coefficient of the mixed gas and other real roadway conditions. We derived the following results: Gas group gather together at the bottom of the roadway when it gush from driving working face by wind action, and then rise to the top gradually. Its volume increased while gas concentration came down in the process of migration. Attenuation degree of gas group diminished slower as the volume of gas group turn larger when the wind velocity is constant. Gas attenuation degree diminished slower as wind speed came down while gas emission volume is constant. Contrarily, wind speed is constant, the volume of gas emission became larger the maximum values of gas group became much more approximated to power function.