Research on Simultaneous Extraction Technology for Coal and Gas of Thin Seam Group

Qitaihe Mining Area is characteristics of thin coal seams,low permeability for gas,low hardness coefficient of coal,high gas content,strong adsorbability and quick attenuation of the initial velocity of gas emission.In addition,the coal seams in this mining area have the character of subgroups and the interval between each group of seams is small.In this paper,the gob-side entry retaining for gas extraction from adjacent seams was put forward and the system for simultaneous extraction of coal and gas of thin seams in Qitaihe Mining Area was built in order to solve the difficult technical problems including the difficult drilling construction along seams,the poor gas drainage effect,and the disallowed gas concentration at the upper corner angle of the working face and in the return air.The application research on this technology was conducted in Taoshan Mine in this mining area.The extraction results indicated that the use of this technology could achieve the high-efficiency simultaneous extraction of coal and gas.