Numerical analysis of oxidation zone variation in goaf

A good understanding of seepage flow distribution and the situation of coal spontaneous three zones in the goaf is of great value to integrated control of coal spontaneous combustion. Based on the theory analysis of voidage and permeability coefficient of porous media in goaf, this paper sets up a seepage flow mathematical model and analyzes the air leakage flow field and oxygen concentration field of the goaf with numerical analysis software to reveal the variation law of oxidation zone with the change of wind velocity and voidage. It provides scientific basis for fire source locating and prevention of spontaneous combustion in goaf.