Study on roof control technology of block and sectional mining for continuous miner

In order to solve the difficult roof control problem of block and sectional mining face with continues miner and to realize the rationally falling with certain 1 aw of the roof above the continuous miner mining face, a coal pillar support technology, roof cutting technology with the powered supports and forced roof falling techno logy with the pressure releasing and blasting were provided, meanwhile, an analysis was conducted on the roof control technology of the delta block in the coal mining f ace. The application results showed that with the coal pillar left between the mining chambers, protective coal pillars at the gateway branch and sectional protective coa I pillars, the ladder beam or H type steel bar and anchor reinforced support and the other measures applied to the opening location of the mining chamber could effectiv ely control the roof. Also the applications of the powered support roof cutting technology, deep borehole blasting forced roof falling technology of the gateway branch an d roof blasting technology at the face boundary could rationally control the roof falling.