Coupling model and its application to dynamic failure for hard coal containing gas

Gas-solid coupling model of hard coal containing gas was studied in this paper, the coupling model was resolved by RFPA and the process of dynamic failure for hard coal containing gas was analysized. According to the simulation results, the process was divided into four phases as follows: stress concentration, coal rock fracture induced by ground and gas stress, protection coal pillar was damaged by gas stress (outburst start), Crushed coal was thrown out by gas pressure (outburst development). And three conclusions were obtained in the paper: the ground stress is very important in the hard coal containing gas outburst because the coal structure needs to be damaged by high stress in the phases of outburst start and development; Gas pressure increases the strength of the outburst destruction and reduces the threshold of the outburst destruction, but it's non-dominant effect in the phases of outburst start and development; Hard coal containing gas out-burst endurance is bad and its termination is rapid.