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针对三山岛金矿条件,研究了深部开采取消点柱的工艺技术。首先,调查测试了矿岩物理力学参数,并对矿岩质量进行了分级。其次,在详细分析上下盘及矿体的物理力学特性的基础上,对三山岛金矿深部开采取消矿柱进行了有限元数值模拟,研究得出-555 m水平以下矿体的开采可全面取消矿柱。最后,结合矿床条件,提出了房柱交替式盘区上向分层充填采矿新工艺。工业试验结果显示,该新工艺大幅度提高了单位面积开采强度,对岩层扰动小,盘区生产能力大,矿石损失贫化小,获得了显著的经济效益。此外,对三山岛金矿由于深部开采而导致的地表沉降利用ANSYS软件进行分析,同时对岩层变形进行了监测。结果表明,三山岛金矿深部开采取消矿柱和采用房柱交替采矿新工艺后能够有效控制岩层变形,从而可实现滨海大型金矿床安全高效低贫损开采。
Aiming at the conditions of Sanshandao Gold Mine, the technology of eliminating point columns in deep mining was studied. First of all, the physical and mechanical parameters of ore rock were investigated and tested, and the quality of ore rock was graded. Secondly, based on the detailed analysis of the physical and mechanical properties of the upper and lower plates and the ore bodies, finite element numerical simulation was performed on the pillars removed in the deep mining of the Sanshandao Gold Mine. It was found that the mining of ore bodies below the level of -555 m could be canceled completely Pillar. Finally, combined with the ore deposit conditions, a new technology of stratified filling mining with alternating columns and columns is put forward. The results of industrial tests show that the new process greatly improves the mining intensity per unit area, has little disturbance to the rock formation, has large panel production capacity and low ore loss depletion, and obtains significant economic benefits. In addition, ANSYS software was used to analyze the surface subsidence due to deep mining in Sanshandao Gold Mine, and deformation of the strata was also monitored. The results show that the deep plowing of Sanshandao gold mine can effectively control the deformation of rock strata after the removal of ore pillars and the adoption of the new technology of alternating pillars and columns, so that safe, efficient and low-loss mining of the large coastal gold deposits can be realized.