NUMERICAL SIMULATION OF POROUS FLOW AND SPONTANEOUS COMBUSTION IN GOAF OF ADVANCING MINE U TYPE VENTILATION

Based on the non-isotropic porous medium,the gas transfusion-diffusion equation and the porous medium transfusion synthesis heat transfer equation,a coupling numerical model of spontaneous combustion in goal is established,the solution is obtained with the windward finite element method software (G3).The computation results are displayed by graphics.The advancing mine U-type ventilation is simulated for its leak tendency of gas,oxygen,CO and for the temperature distribution.Two kinds of ventilation are shown to be able to avoid picking the mined-gob area gas by the working face.The computation considers the goaf's anisotropy and shows that the gas gushes out with the spontaneous combustion coupling function and the goaf gas conduction current produces massive leaks.