Numerical Simulation And Optimization Research On The Key Parameters Of Stoping Of Residual Ore Under The Backfill In Tonglushan Mine

Tonglushan Mine, a large main copper mine belonging to Daye Nonferrous Metals Company, is one of the key copper bases of the country. For now, residual ore blocks are in the Tonglushan Mine Ⅲ orebody-245m middle panel where the occurrence conditions are harsh and the stability is poor, and there is backfill the surrounding. With the advance of the mining excavation, the backfill scale is growing as well. Therefore, whether the backfill can effectively support the surrounding rock in entire mining area has become an urgent problem. According to the actual situation, Tonglushan Mine plan to adopt to the upward horizontal slicing filling mining for recovering residual ore, so to study the recovering of residues and mineral resources of-245meters middle pane. After systematic analysis of the research status of stoping of residual ore at home and abroad, a combination of rock mechanical experiments, AHP method numerical simulation, and theoretical analysis was used to deeply study the key parameters of stoping of residual ore. The main research content and research achievements are as follows:(1) According to the distribution of Tonglushan residual ore resources, physical rock mechanics experiments was carried out. The mechanical parameters of the residual ore are determined through indoor tests and dealt with rock mechanics parameters. It provids reference for the design of the remaining ore recovery.(2) The factors influencing the stope stability of residual ore under the backfill was assessed by the AHP methold, and13main associate factors were determined. The results show that the formation and size of the column, the stope width, the physical and chemical property properties of ore and rock, thickness of the top column, as well as the points column spacing are main factors that affect the stope stability of residual ore under the backfill.(3) For the case of leaving continuous pillar, the FLAC3D numerical simulation method was used to simulate the excavation of different recovery programs. The research results show that the optimal stope width is9m, the optimal pillar width is4m, and the best thickness of support pillar is3m. (4) Based on the research results of the continuous pillar, the key parameters of stope in the case of leaving the points column was studied by the FLAC3D. Considering the simulation results and ore recovery obtained, the optimal column size is quantified as4*4m2with the minimum interval space8m.(5) In order to check the residual ore mining stope width, point column size, spacing of point columns and support pillar obtained by the numerical simulation, the relevant theoretical formulas were used. The results show the numerical results accord with theoretical results.