Study On The Numerical Simulation Of Gas Flow Law In Gob Area Of Huangling No.2 Mine Workface

With the development of science and technology, most productive use of integrated mechanized mining methods mine. This method is efficient, fast forward, but its exploitation of strength, residual coal mined-out area and more space large rock mass gravity, and also serious damage of surrounding rock, making gob area flock to face a sharp rise in gas, face return air Lane and the upper corner gas frequently overrun. So master Workface Gob gas flow pattern and the implementation of drainage measures in mined-out area is to reduce the face amount of gas emission and the upper corner of the primary means of transfinite. Study on the gas flow law in gob is necessary for coal mine safety.This paper systematically summarizes the gob gas migration law and numerical simulation research. According to previous research results and the Gas Drainage status of 107 workface gob on Huangling NO.2 mine that it will consider the non-high-arched gob caving in three-dimensional porous medium model and use numerical simulation of Fluent. In the course of the study, first through the fluid, gas seepage mechanics and the theories of fluid mechanics in porous media has established Workface Gob mathematical model of gas seepage. Secondly, through on-site visits 107 workface high gas drainage hole drilling conditions to be mined-out area of overlying rock fractures zone and the height of caving zone, especially come to caving zone of non-specific high-risk fall conditions for the establishment of gob area provide a basis for three-dimensional model. Then, this paper Fluent simulation of flow pattern tile gob area to be concluded as follows: return air side of high gas concentration in the return air side of caving arch arcs area with a large number of high concentrations of gas gathering, the gas concentration can be achieved 7%, roughly the region away from the return air side of 5-30m, a height of 12-25m. Finally, using simulated by the law of gob gas flow optimizes the high fracture drilling parameters in 107 workface, and for subsequent gob drainage was provided.