三鑫金铜矿深部中段顶柱回采稳定性分析
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摘要
针对三鑫金铜矿深部中段顶柱回采的稳定性问题,以-420～-570 m中段的顶柱为研究对象,利用Flac3D模拟软件,探索不同中段顶柱回采过程中的应力、位移、塑性区等变化规律,并根据前期研究结果,选取每个中段顶柱"一层三步骤"的回采过程进行分析。结果显示:随着中段的加深,应力、位移、塑性区等变化规律不变。水平位移值、竖直沉降值及底板隆起值均随中段呈线性变化,且均在-570 m中段达到最大。各中段靠近临空面处为活性塑性区,基本在1 m的范围内。在应力平衡过程中,巷道顶部的矿体均未形成塑性区,在回采的过程中较稳定。因此,采用的优化方案在各中段顶柱回采过程中,能够保证采场的稳定,安全可行。
To study the stability of crown pillar extraction in deep levels of Sanxin Gold-Copper Mine,in a case study of the crown pillars at-420--570 m levels,the paper used Flac3 Dsimulation software to explore the changing rules of the stress,displacement and plastic zone during the crown pillars extraction process in different levels. And according to the early-stage study results,the " 1 layer 3 steps" extraction process of the crown pillar at each level was chosen for analysis. The results show that with the depth of the level,the changing rules of stress,displacement and plastic zone remain the same. The magnitude of the horizontal displacement,vertical subsidence and floor heaving takes linear variation with the level and reaches the peak at the-570 m level. The sections adjacent to the free face are plastic zones with the range within 1 m. In the stress balance process,the ore bodies at the top of the roadways have not formed the plastic zones and are stable during the extraction. Therefore,the optimization plan adopted is safe and viable,and can guarantee the stope stability of the crown pillar extraction at each level.
To study the stability of crown pillar extraction in deep levels of Sanxin Gold-Copper Mine,in a case study of the crown pillars at-420--570 m levels,the paper used Flac3 Dsimulation software to explore the changing rules of the stress,displacement and plastic zone during the crown pillars extraction process in different levels. And according to the early-stage study results,the " 1 layer 3 steps" extraction process of the crown pillar at each level was chosen for analysis. The results show that with the depth of the level,the changing rules of stress,displacement and plastic zone remain the same. The magnitude of the horizontal displacement,vertical subsidence and floor heaving takes linear variation with the level and reaches the peak at the-570 m level. The sections adjacent to the free face are plastic zones with the range within 1 m. In the stress balance process,the ore bodies at the top of the roadways have not formed the plastic zones and are stable during the extraction. Therefore,the optimization plan adopted is safe and viable,and can guarantee the stope stability of the crown pillar extraction at each level.
引文
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[2]李纪玉,刘双建,陆爱珍.采场顶、底柱回采方法的探讨[J].黄金科学技术,2002,10(4):26-30.
[3]张洪训,王青元,朱万成,等.新城金矿Ⅴ#矿体-580 m中段顶柱采矿方法研究[J].金属矿山,2012(12):1-4.
[4]赵奎.残留矿柱回采与空区稳定性的有限元模拟研究[J].采矿技术,2002,2(2):51-53.
[5]赵伏军,李夕兵,赵国彦,等.新城金矿顶底柱开采稳定性研究[J].黄金科学技术,2002,10(6):15-19.
[6]赵伏军,李夕兵,赵国彦,等.进路法回采顶柱人工假顶的稳定性分析[J].金属矿山,2002(4):27-29.
[7]李何林,胡崴.顶柱稳定性的FLAC3D数值模拟研究[J].金属矿山,2015(增刊1):98-100.
[8]蔡美峰,刘卫东,李远.玲珑金矿深部地应力测量及矿区地应力场分布规律[J].岩石力学与工程学报,2010,29(2):227-233.
[9]周德红,李文,冯豪,等.基于FLAC3D大冶铁矿矿柱回采过程的应力分析[J].武汉工程大学学报,2016,38(3):277-282.
[10]王如坤,徐强,申超霞,等.大冶铁矿矿柱回采方式的研究[J].矿业研究与开发,2015,35(7):17-22.