Numerical Simulation on Permeability Properties of Coal Containing Gas Based on Continuously Variable Temperature Conditions

For variable relationship of coal containing gas permeability and temperature, we comparably research the influence of temperature change on coal gas seepage based on physical experiments and numerical simulation, through the in-depth analysis of gas flow characteristics of coal samples, we get the following conclusions that by the experimental study of stress field-temperature field-permeability, coal permeability decreases with the increasing temperature, the change curve was "S" type curve; coal sample permeability changing with temperature curve can be divided into five stages, the slow decline stage, the accelerating decline stage, letting down stage, the secondary accelerating decline stage, flat stage; the temperature T is between 25 ℃ and 80 ℃, coal permeability changes with temperature amplitude with increasing axial pressure and confining pressure increased; the numerical model can be good for seepage characteristics of coal thermal coupling that is calculated in the case of simulation, and the numerical simulation results are in good agreement with the experimental results.