Based On The Mining Face Roof Field Gas Concentration Distribution Inface Of Location Optimization Roof High Pumping Lane Study

Fully mechanized production technology because of coal mining its high efficiency, high yield and other advantages is widely used. There are also problems of large amount of gas emission, in which a large number of goaf gas emission, directly affect the mining surface safety, therefore control goaf gas becomes more significant. Roof high pumping Lane drainage of goaf gas was verified by practice to solve goaf gas problem, guarantee the safety of coal production has good effect measures. While different position roof high pumping lane drainage of goaf gas effect is significantly different, so determine the high pumping Lane position appropriate, has the important theory and the practical effect.The paper describes the gob overburden failure after the formation of the "three zones" that the caving zone, fault zone and bending zone with the characteristics and related calculation. According to the actual situation of Yiyuan mine150109working face get the caving zone and fracture zone height; In the "three zones" formation, in which fault zone gas flow state has two forms rise and diffusion; Then analysis is to study the goaf gas source and influence factors and calculation; And based on the theory of porous media mining area is considered as a porous medium, so as to establish a margin of coal gob area physical model, In this paper, according to the relevant discipline knowledge,Using FLUENT numerical simulation Yiyuan mine150109working face to get The high pumping Lane position.Using FLUENT numerical simulation Yiyuan mine150109working face:1)when without roof high pumping lane the goaf gas situation;2)when roof high pumping Lane level positioning27m, vertical high were32m,40m,48m,56m the goaf gas condition;3) when roof high pumping lane is simulation of the most appropriate40m vertical height, levels were27m,35m,43m,51m the goaf gas conditions. Through the analysis of these three status obtained three-dimensional diagram, analyzed goaf gas flow law, and obtained the most appropriate roof high pumping lane position by comparing.In the transverse direction gas state,goaf gas distance coal face farther away its concentration will be higher. In the coal mining face, the gas in intake airflow roadway is low concentration. When gas flows through the process of mining face in concentration will slowly increase the gas concentration higher in return airway. While in the goaf vertical, fault zone have gas accumulation.The more upward gas concentration will also be largen. When roof high pumping Lane level positioning27m, vertical high were32m,40m,48m,56m when the goaf gas situation, this is to get appropriate roof high pumping lane vertical height, meantime also analyzed roof high pumping lane’s the gas law. The results show that when the height is40m, high drainage roadway gas concentration29%, upper corner gas concentration0.75%, In this case with the other position compared to the better. When the height of40m were determined, Then simulated level27m,35m,43m,51m the goaf gas situation, thus get the most suitable for the horizontal position, from the simulation results when the level of35m the horizontal position of the most appropriate, high drainage roadway gas concentration35%, Upper corner gas concentration0.7%, so the roof high pumping lane position height40m, level35m. With Yiyaun mine150109working face the actual situation for the comparison that the simulation results of roof high pumping lane position and the actual layout of high pumping lane position is consistent, simulation of gas drainage and actual gas drainage effect also differs not quite, can solve the problem of gas in goaf, can provide a reference method for roof high pumping Lane layout.