Abstract
Using the Jisan Coalmine’s top-coal caving for the 3down coal seam with ascending mining as the project background, the air-leakage characteristics of the goaf was analyzed. Through data fitting of the in situ observation, the models of gas seepage, diffusion and air-leakage in the goaf were established in ascending mining. The Computation Fluid Dynamics software Fluent was used to simulate the air-leakage law of the goaf. The results of the numerical simulation provide a basis for the use of the technology of ventilation and fire prevention in the working face of an ascending mining, which ensures the safety in production in the working face of the top-coal caving for 3down coal seam in the Jisan Coalmine.
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