Technology of continuous rotation mining in M-shape working faceof thin coal seam

In order to solve the problem of difficult to equipments which used in longwall mining and realize high efficiency mining in irregular working face,based on the background of No.94064 mining face in Dashe Mine,characteristics of strata behaviors and movement law of overlying strata are studied by numerical analysis,theoretical research and other methods.The M-shape working face continuous rotation mining technology is proposed. Research result shows that the Yeqing limestone roof of thin seam is mainly continuous and slow subsidence rather than broken. The roof loading estimation method based on roof continuous subsidence is proposed. The M-shape working face mining technique is proposed,which is coordinated and cooperated with four processes,including increasing (reducing) supports,prolong (shorten) scraper conveyor,the proportion of roll steering control,the supplements of high grade support. It makes the working face rotate in large angles for many times,and then realizes the fully-mechanized mining technology of the M-shape working face of thin coal seam without moving,which greatly saves the economic cost of moving and preparing new open-off cut,and prolongs the service of coal mine.