Key control technology of no coal pillar mining method in thick layer and hard roof

Compared with the general conditions of the roof, the problems caused by the self-forming roadway mining without coal pillars in the thick layer and hard roof are very prominent.This paper systematically summarizes the key control technologies for coal-pillarless mining on thick-bed hard roofs, including the adoption of graded comprehensive pre-splitting blasting technology system, high constant resistance and large deformation anchor cable support technology, and gangue and anti-scour support technology system, which improves the no coal pillar mining technology system.The technical framework of self-forming roadway mining without coal pillars further promotes the technological innovation of the coal mining industry.