THE EFFECT OF STRESS IN POROUS MEDIA ON PORE PRESSURE

The purpose of this paper is to analyze the variation of pore pressure and flow amount of gas in the course of mining by a great deal of site tests. The result shows that the coalbed containing gas is a complex system. The key factor causing the system to change is the stress in coal bed. The pressure of gas increases exponentially with increasing stress in coal bed; and the gas seepage is controlled by gradient of gas pressure.