Numerical simulation study on the influence of air leakage on oxygen concentration in goafs of fully mechanized caving mining with shallow buried and large mining height

In order to reveal the influence of air leakage on oxygen concentration in goafs fully mechanized caving mining with a shallow buried and high height, No.122108 working face Caojiatan coal mine different seasons was tested by SF 6 tracer gas test method. Based result test, “three zones” spontaneous combustion goaf were simulated using Ansys Fluent fluid dynamics software, compared that field test. The shows vertical is serious, wind speed high, rate up 86.96%. higher winter lower summer. intensity decreases from inlet side return through middle goaf. range oxidation heating zone 98–245 m 33–96 side. numerical simulation well consistent data. research conclusion can guide fire prevention extinguishing lay foundation for control height.