Application and Technology Research on Rapid Gob- side Entry Retaining in Shendong Mining Area

According to the inadequate, poor leakproofness performances and low mechanization degree problems between the support resistance, yielding and ot her mechanics performances existed in the conventional sidewall support of the gateway and the surrounding rock deformation of the gob- side entry retaining, based 0 n the analysis on the pneumatic backfill gateway retained, high water material backfill gateway retained, face end steel module support and pumping backfill gateway re tained and concrete backfill gateway retained with the flexible module, an evaluation was conducted on the equipment allocation and operation conditions of four gatew ay retained methods. Finally, a flexible module concrete preparation and conveyor unit was selected for the rapid gob- side entry retaining in Yujaliang Mine. A surface concrete dry mixing and a concrete feeding in underground mine, mixing with water and continued pumping operation could be realized. The study showed that the set equipment could meet the requirements of the rapid gob- side entry retaining in Shendong Mining Area, the backfill speed could be reached to 20 m I shift and the comp ressive strength of the backfill mass could be reached to 25 MPa.