Abstract: Abstract: This paper, on the basis of "a simplified version" of refuge chamber, establishes the mathematical model of CO2, O2 concentration under the different gas supply in the refuge chamber. Combined with the specific circumstances of the permanent refuge chamber of Xiao Liang Gou Mine, we quantitatively analyzed the concentration change of CO2、O2. We in site carry out the synthesis simulation about safe refuge in the permanent refuge chamber of Xiao Liang Gou Mine. We compared the date of field monitoring of the changes in the concentration with the theoretical value, verifying that the air pressure to supply gas can protect the Oxygen demand.

Key words: permanent refuge chamber, pressed into the air, gas protection, mathematical model, numerical analysis