Intensive Design and Practice of Underground Coal Gangue Intelligent Dry Separation Roadway Group in Jining No. 3 Coal Mine

In order to realize the efficient construction of underground intelligent dry separation system in Jisan Coal Mine, combined with the existing filling mining layout, main coal flow system layout and mining planning, it is determined to build underground intelligent dry separation system at the head of belt roadway in the west area. Two layout schemes of underground intelligent dry separation roadway group were put forward. Through the comparison and selection of the schemes, the head section of the rubber machine in the west area was raised, and the roof of the top chamber of the upper chamber of the No.8 warehouse of the head was transformed into a roller screen chamber. The separator chamber and 15 m deep ϕ6000 mm gangue warehouse were constructed on the east side of the No.8 warehouse. The gangue transportation roadway was arranged under the gangue warehouse to communicate with the filling mining face of the sixth mining area. The scheme is compact and reasonable, with less construction investment and reliable operation of the system. The intensive layout of the underground coal gangue separation system and the integrated green mining of "mining, dressing and filling" are realized. In view of the special construction of the lifting of the head section of the rubber machine in the west area and the super large section roller screen chamber involved in the construction process, the construction scheme of floor grouting filling, super large section bolting and grouting support, layered roof picking and vertical loose blasting in the upper and lower layers of the super high chamber is formulated.