Abstract:

Through using mathematical-physical model of gob flow field, distribution of oxygen concentration and velocity of air flow are determined based on COMSOL. The gob spontaneous“three zones” can be divided by the method of combining oxygen concentration with air leakage wind speed. And the simulated data is verified with measured oxygen concentration on the side of both intake and return airways. The results showed that the method is available and effective and the width of the oxidation and heat accumulation zone（OHAZ）in the gob of the long top-coal caving face is distributed more widely on the side of both intake and return airways for the serious air leak, which have certain guiding significance to prevent and control coal spontaneous combustion of the working face.

Key words: gob, spontaneous combustion “three-zone”, numerical simulation