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顶底柱残矿回收的关键技术是顶板在回采过程中的稳定性问题。针对某铅锌矿采用的高强度加筋充填体假顶,分别对矿房采场和间柱采场下假顶的受力情况进行分析,并采用薄板理论分析确定充填体假顶厚度;利用FLAC~(3D)数值模拟软件模拟不同假顶厚度下底柱矿体的开采过程,研究充填体假顶厚度的变化对充填体假顶稳定性的影响;最终得出充填体假顶的最优厚度。研究结果表明:矿房采场下充填体假顶最优厚度为2.5 m;间柱采场下充填体假顶最优厚度为7.5 m。模拟结果与理论值相吻合。上述研究结果与类似矿山实际应用相比较,具有科学合理性;并在典型条件的顶底柱采场充填体假顶厚度确定中得到成功应用,具有指导意义。
The key technology of top-bottom column residue recovery is the stability of the roof in the process of recovery. Aiming at the top of high-strength reinforced backfill used in a lead-zinc mine, the forces of the false roof under the stope and the stope are analyzed respectively, and the thickness of the top of the backfill is determined by using the thin plate theory. FLAC 3D numerical simulation software was used to simulate the mining process of bottom pillars with different fake top thickness and to study the influence of the thickness of backfill on the stability of backfill. Finally, the optimal thickness degree. The results show that the optimum thickness of the top of the backfill under mining stope is 2.5 m and that of the top of the backfill under the stope is between 7.5 m. The simulation results are consistent with the theoretical values. The above research results are scientific and reasonable compared with the practical applications of similar mines. It is of guiding significance to determine the thickness of top-bottom column stope filling roof in typical conditions.