Abstract: The Fluent numerical software and the standard double equation model are adopted to do some research on the gas distribution rule of sublevel caving goaf under the ventilation method of U+L and U+I.According to the numerical simulation results,along with the trends,tendencies and vertical direction,the gas distribution rule of sublevel caving goaf under the ventilation method of U+I is consistent to the ventilation method of U+L.Compared with the ventilation method of U+L,the ventilation mehtod of U+I is capable of decreasing the gas conentration of the working face and the upper corner,so,perfect gas controlling effects can be obtained.

Key words: Caving working face, Ventilation way(U+L type, U+I type) , Numerical simulation