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With modern mechanized coal mining development, expanding mining, mining continues to accelerate, mining gas deposit balance of the original damage is more evident. Face showing a large number of gas emission, high intensity, emission characteristics uneven, giving gas disaster management has brought new challenges; the other hand, the use of fully mechanized coal mining technology and high efficient intensive modes of production so that gas control technology can not keep up the pace of increase in coal production, which also makes coal mine safety production is facing new threats. Gob gas emission is caused by gas emission overrun one of the important reasons for gob gas emission of gas treatment and control has become a major task. This article is mainly through theoretical analysis and experimental study a combination of methods, respectively, U-type ventilation, Y-type ventilation, \system mechanized mining face gob gas migration law. This paper summarizes a lot of the work on the basis of previous studies, the system analyzes the mechanized mining face gob gas main sources and Gob on Gas Emission; porous media by introducing the concept of the gas in goaf zone migration characteristics and flow mechanism is analyzed theoretically; introduced a similar test model to be followed by similar flow conditions, flow similarity criteria and similarity theorem, analyzes the similarity theory in fully mechanized mining face goaf gas migration similar material Experimental research applications. In this paper, gob gas flow theory and similarity theory, in the laboratory to establish a multi-system mechanized mining goaf similar material test model, respectively, of fully mechanized mining face U-ventilation, \way, \goaf gas concentration distribution, and through the line chart detail reflects the different systems goaf caving zone Nevas direction along strike and dip direction of the concentration distribution trends. In the U type ventilation system, measured through test after changing the face velocity inlet gob gas concentration distribution of the wind speed increases will come gob gas concentration profile as a whole gob deep to move in the direction of the conclusion that to some extent from the lower face gas concentration, but after analysis found not fundamentally solve the problem on the corner gas gauge. Finally, different ventilation systems gob gas concentration distribution and gas migration law comparative analysis, combined with the characteristics of each type of ventilation system were analyzed and summarized for the actual production of the type of selection and face ventilation gas control to provide certain theoretical reference.
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