Analysis on the surface gas drainage technology of “drainage first and construction later” in Guanzhai mine in Guizhou Province

According to the requirement of "drainage first and construction later", combined with the development and deployment of Guanzhai mine, the technological process of "drainage first and construction later" was set up in Guanzhai mine. This paper puts forward the technique of water pressure fracturing in the main inclined shaft, cavernous completion in the auxiliary shaft, and cluster fracturing in the first mining face. It is concluded that implementation of the surface gas extraction of "drainage first and construction later" in Guanzhai mine could achieve a good overall coordination, and had good reference significance for implementation of coordinated development of coalbed methane and coal in coal mining areas.