The Research Of Goaf Gas Emission Law About Hard Roof Comprehensive Mechanized Coal Mining Face

This thesis, the author discusses in more detail the migration of gas in the goaf of full-mechanized mining working face and its characteristic, combined with hard roof migration of analysis and numerical simulation, and in-depth analysis and study the law of emission gas which from goaf, its application in practice to solve the coal mine safety production practical problems.On the basis of data collecting from mine, the author analyze and summarize law in full-mechanized mining working face, which including the emission source of goaf, the law of gas flow and the distributing of gas concentration. The thesis also analyze some factors that affect the emission rate from goaf, the main factors are cycle pressure ,air quantity, production, the velocity of the working face advanced and production processes. The mathematical model of migration of gas in goaf is established, use the relevant Program simulating the condition of a goaf. By means of the numerical simulation, it can provided reliable evidence for solve the problem of gas. The author bring forward the way to solve the problem of gas by gas drainage combining rational ventilation system. During this technique was applied in Huaibei mine of Guobei coal in Anhui Province, The effect was investigated and analyzed by tracking the Process in the mine, results of this method were check-out by practically.