Study of roadside packing to go with gob-side entry retaining technology on crisp surrounding and blasting face in the Xinzhuang mine

In order to improve the recycle rate of coal resources, extend the service-life of the mine, and alleviate the tensions of excavation-replacement in the Xinzhuang mine, this paper presents a high-water material for roadside packing to go with gob-side entry-retaining technology on crisp surrounding rock and blasting working face. Based on the conditions in the field, the authors analyzed the utility of the filling structures of the 12011 machine roadway. On the basis of engineering analogy method and laboratory experiment, the authors determined the ZKD new high-water material ratio of each component and the filling process parameters. This research shows that when four conditions are met—rectangular packing is used; water cement ratio of the new high-water material is 1.8:1; the Φ 18 mm × L 3400 mm anchor bolt is imbedded in the filling body; and supplementary support, which consists of anchor bolt, wire rope, and steel beam, is applied—the average contraction rate of the roadway section is 13.38%, achieving a more satisfactory effect. Compared with gob-side entry driving, it can improve the indirect profit by 9.86 million yuan; compared with digging a new roadway, it can increase the profit by 5688.5 yuan per meter.