Construction technology of super-large diameter feed hole in Beixulou coal mine
During the mining process,coal mining enterprises dump a large amount of coal gangue on the ground.Through the construction of a super-large bore hole near the ground coal gangue bin to the underground roadway,the solid waste of coal gangue produced can be transported to the underground gob,which can not only solve the environmental pollution of coal gangue on the ground,but also effectively control the movement and deformation of the surface,so as to realize the green and sustainable development of coal mines.In the construction practice of large diameter feeding hole in Beixulou coal mine,Tengbei mining area,Shandong Province,small diameter pilot hole is pre-constructed,5-stage re-expanding hole is opened in one stage,and 4-stage re-expanding hole is opened in the second stage,and a large diameter feeding hole is drilled in a coal mine with positive circulation of mud and air lift reverse circulation of cone bit.Its mature construction scheme has certain guiding significance for the large diameter drilling project.
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