Gas Comprehensive Control Technology Based on Gob-Side Entry Retaining

In order to effectively control the gas concentration in working face and upper corner and to prevent the occurrence of gas accidents,combining with the practical situation of low air permeability coal seam of Shanxi Qinxin coal mine,on the basis of analyzing the air flow field characteristics of " U" model and " Y" model ventilation in gob,comprehensive measures of gas control based on gob-side entry retaining of the combination of " Y" model ventilation,buried tubes extracting in gob and high level borehole extracting in pressure released area are proposed.The field monitoring results show that the The technology can effectively control the gas concentration in working face and upper corner.