阶段空场嗣后充填采场稳定性分析:模型及试验研究

Stability analysis of stage open stope with delayed backfill: modelling and experimental studies

针对龙湾铁矿阶段空场嗣后充填采矿过程中充填体及围岩稳定性问题,利用相似模拟试验,监测矿块开挖和采场充填过程中采场及其围岩位移场的演化规律;将充填采场简化为薄板力学模型,导入COMSOL Multiphysics软件平台进行数值分析。将数值计算结果与相似模拟结果进行对比,发现二者比较吻合,表明模型计算所得的位移和应变规律基本符合实际。研究结果显示,采场稳定性与矿体强度、充填体强度、采场完整性等因素密切相关。本研究得出的充填采场及其围岩的位移场和应变场分布演化规律,能够为类似矿山的充填采矿作业提供参考依据和数据支持。

In terms of the stability of backfill and surrounding rock during the mining process of Stage open stoping with delayed backfill at Longwan Iron Mine,a similar simulation experiment was conducted to investigate the displacement field evolution of the stope and its surrounding rocks during the mining and filling processes. The backfilling stope was simplified into mechanical model of thin plate,which was imported into the platform of software COMSOL Multiphysics to carry out numerical analysis. The numerical computation results were compared with the similar simulation outcomes,and it was noticed that they agreed well with each other. This indicated that the evolution of displacement and strain obtained by numerical calculation accorded with the actual conditions basically. The results showed that the stope stability was closely related to the strength of ore body and backfill as well as the stope integrity. The displacement and strain field evolutions of the filling stope and its surrounding rocks obtained in this study can provide reference and data supporting for the mining and backfilling operations of similar mines.