Gas Drainage System Optimization For Goaf Of Working Face No.1551(1) In Panyi Coal Mine

In recent years, with the increase of coal mines output, coals become deeply mining in our country. Meanwhile coupled with the complexity of geological conditions of coal seam, the incidence of coal mine disasters and accidents maintain a high-level. Among them, the gas disasters account for most of mine disaster accident. Therefore, in the process of coal mine production, effective governance gas, reduce the gas concentration is a necessary means to improve mine safety and efficient production.Taking1551(1) working face as the research object, analyzing its source. Among them, the goaf gas emission accounted for over60%of the total emission; therefore, it is necessary to first solve the problem of goaf gas in coal mining process. Nowadays the effective measure to solve the goaf gas is to extraction goaf gas.According to the1551(1) specific actual situation of working face and goaf, based on the geological conditions of coal seam and coal rock physical properties to establish numerical model to the goaf overburden by FLAC3D software. Then we can directly see the goaf of overlying rock fissure and the overburden stress distribution through the operation. Through the analysis of simulation results, we can draw on a range of overburden caving zone and fractured zone, we can find that the results of the simulation and calculation of the caving zone height and fractured zone roughly the same. Then using the Fluent software to goaf gas only in ventilation simulation analysis under the condition of migration, we can get the migration law of goaf gas and air leakage of goaf in the influence of the concentration of the gas.Finally, according to the study of mined-out area, to determine reasonable extraction measure and provides the reference for the goaf gas control.