关键词: 缓倾斜矿体上盘, 预留矿柱, 诱导冒落, 力学分析

Abstract: This paper proposes an original technique in the fields of efficient mining methods concerning flat pitch and medium-thick fragmented ore. In view of the fact that the upper lithosome is hydrated and readily broken, and that the damage caused by the vibration of stopping blasting may contribute to the premature depletion, increase of water inflow, agglomeration and ore drawing difficulty, the upper plate should be reserved in order to diminish the damage of the surrounding upper lithosome caused by the blasting vibration. Concurrently, the induced blasting holes should be displayed in the lower area in order to destroy the roots of remaining areas and to induce the reserved jambs to maintain collapsing. Using Flac^3d, mechanics of the stress, displacement changes and plastic forming of the reserved jambs were simulated and analyzed during the extending and developing process. And it demonstrated the mechanic process that reserved jambs may reduce the damage of upper plate terrain during the stopping. Then it is concluded that a triangular protecting jamb with 2 m thickness should be reserved in the upper plate, which is helpful for the development of the plastic forming and the maintenance of the upper plate stability. Also the conduct of induced collapse during the slot cutting of the lower plate may lead to the complete retrieval of this jamb.