Abstract: Gas hazard has influenced the normal production of coal mine. Especially gas hazard in goaf is one of the key of mine disasters prevention and control currently in mining process of thick coal seam of high gas. Taken the fully mechanized coal face goaf of Sihe mine in Jin City of Shanxi province as the research object, goaf gas extraction numerical model of Sihe coal mine was constructed after analysis of gas extraction situation, gas emission law of working face, proportion of goaf gas emission to working face gas emission, extraction gas method of buried tube of goaf and extraction parameters. Through analysis and contrast the numerical results of gas migration distribution law, goaf gas buried tube extraction technology parameters of Sihe coal mine was obtained. It has a certain guiding significance for Sihe coal mine goaf gas extraction efficiency.

Key words: Goaf, Gas extraction, Pipe laying, Numerical simulation, Gas migration