NUMERICAL SIMULATION ON STABILITY OF REINFORCING BARS FOR SLICING DRIFT DURING UNDERHAND CUTTING AND FILLING OF PANEL

摘要

Aiming at the backfill quality improvement in a mine,the numerical model of the slicing drift and hexagon stope in the under cutting and filling is built by the FLAC 3D software.The artificial roof of the slicing drift with the ordinary backfill and minforeement backfill is investigated.Then the slicing drift and hexagon stope stress field,the plastic field and displacement field is analyzed quantitatively.The mechanical parameters of the reinforcement backfill are obtained by the equivalent strength principle from the reinforced concrete design standard.The analytical results showed that,the artificial roof of slicing drift against the stope safety production with ordinary backfill.The caving and discrete block falls are prone to be happened in the path and slicing drift intersecting channels.Therefore,monitoring and the reinforcement density should be strengthened in the key areas.But the density of the reinforcement should be reduced in the surrounding rock where only the slicing drift is excavated.