CFD Simulation of Symbiotic Disaster Arising from Gas Explosion and Spontaneous Combustion in Longwall Mining Gobs

With the increasing of mining depth, the symbiotic disaster of gas and coal spontaneous combustion is gradually increasing. In order to explore the multi-field coupling law of gas and coal spontaneous combustion in the goaf, the numerical simulation method was used to optimize the key parameters and find the best balance between effectively controlling the gas without expanding the danger zone of spontaneous combustion. The results show that, the higher the level of the high-level drainage roadway, the better the drainage effect, but considering the spontaneous combustion period, it is necessary to reasonably calculate the optimal drainage roadway layout position; the buried pipe extraction has good effect on gas control, but it is not conducive to fire prevention.