Research On Gas Drainage Techonlogy Form Goaf Of High Gas And Thick Coal Seam

Now the gas accidents have become the focus of prevention and treatment, especially in the process of high gas and thick seam mining. And goaf gas is one of the most serious hazards which relates to the coal mine gas accidents Ventilation is the basic measure for preventing and controlling gas accidents, currently besides gas drainage is the most effective technical measures. The amount of gob gas emission accounts for a large proportion of the total in coal mine gas emission, gob gas drainage can not only effectively reduce goaf accidents, but also can ensure that coal mine safety production and increase the coal mine gas drainage volume and gas utilization. In this paper, the gob of a test coal mine in Shanxi Province Qinshui coalfield is choose as the research object, according to the analysis of the gas drainage status, the gas emission laws, the ratio of gob gas emission, the gas drainage methods and gas drainage parameters in this mine, we get that gas drainage of this mine gob is still very inadequate. After summarizing and analyzing the laws of methane movement in goaf and the gas drainage methods, I establish a goaf gas drainage numerical model and carry on numerical simulation, at last get the conclusion: the effectiveness of a gas drainage measure with buried head road at a depth of 100m and branch pipe at a depth of 50m is best, this measure can reduce gas Concentration below to 0.7%; in this test mine the gas concentration of surface gas drainage is between 50% and 65%; the gas drainage effectiveness with buried tube drainage and high position drilling is better. The conclusion can be as the theoretical basis in the test mine gob gas drainage and also have some practical significance for increasing this mine gob gas drainage efficiency.