Numerical Simulation Of Coal Methane-coal Coupling Effect In Roadway

There are so many various kinds of coal mine disasters in our country , the methane gas accident is more harmer than all other accidents and is worthy of the name of the first killer in coal mine safty.The proportion of accidents and deaths toll in drivage face is 40.92% and42.62%.Among the 17 heavy accidents of methane gas accident in 2008 , there were 11 occurred in heading face , so the reserch of methane gas flowing with the influence of digging stress is becoming more impotant .Previous researchers usually simply study the distribution regularity and evolution of the stress,energy and methane gas , seldom consider the stress-seepage coupling effect . The article carry on the resersh of sress-seepage coupling effect base on the previous study : the first , through the experiment provide the parameters for the numerical simulation and set up the relationship equation between the bulk strain and analytical of coal methane ; the second , set up the stress-seepage coupling model with the dynamic porosity and dynamic permeability ; the last , verify the coupling model with the Multi-physical coupling numerical simulation software COMSOL Multiphysics.