Gas Drainage Technology of Strike High Level Suction Roadway by Stages in Dongqu Mine

According to the problems of the gas drainage in goaf and gas transfinite in the angle of up corner of fully-mechanized face in Dongqu Coal Mine, similar material simulation test was carried out. Crack developing laws and activities characteristics of goaf roof rock were researched during mining process in face. Reasonable location parameters of high drainage roadway in different mining conditions were determined.