残留矿柱安全回采研究与工程实践
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摘要
在维持矿柱采场稳定的前提下提高其回采率,是残留矿柱安全开采亟待解决的问题。以天马山黄金矿Ⅱ号矿体5#矿柱上向分层充填法开采为例,通过多种理论方法计算并得出了2m厚的护壁可以保证自身稳定,验证了2 m厚的护壁抗倾覆的安全系数在1.5左右。然后,结合矿山实际的采矿方案,利用Phase2软件模拟并分析了5#矿柱的回采过程,除了上下盘区域可能会出现深度小于1.3m的局部垮落外,采场和护壁整体上均处于稳定状态,矿柱回采结束后对地表选厂未造成任何影响。
How to improve the recovery rate while maintaining the stability of pillar stope is an urgent problem need to be solved in the process of safety recovery for residual pillars.Taking the No.5 pillar ofⅡ ore body mined by upward cut-fill mining method in Tianmashan Gold Mine as an example,a variety of theoretical methods were used for calculation.It was concluded that 2 mthick retaining wall could ensure its own stability,so as to verify that its safety factor of anti-overturning was about 1.5.Then,combined with the actual mining scheme,the Phase 2 software was used to simulate and analyze the mining process of the No.5 pillar.Except for the local collapse of the upper and lower wall with depth less than 1.3 m,the stope and the retaining wall were all in stable status,there was no effect on surface dressing plant after the pillar stoping.
How to improve the recovery rate while maintaining the stability of pillar stope is an urgent problem need to be solved in the process of safety recovery for residual pillars.Taking the No.5 pillar ofⅡ ore body mined by upward cut-fill mining method in Tianmashan Gold Mine as an example,a variety of theoretical methods were used for calculation.It was concluded that 2 mthick retaining wall could ensure its own stability,so as to verify that its safety factor of anti-overturning was about 1.5.Then,combined with the actual mining scheme,the Phase 2 software was used to simulate and analyze the mining process of the No.5 pillar.Except for the local collapse of the upper and lower wall with depth less than 1.3 m,the stope and the retaining wall were all in stable status,there was no effect on surface dressing plant after the pillar stoping.
引文
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[2]朱青凌,尚振华,王林.浅层复杂残留矿柱安全开采优化研究[J].矿业研究与开发,2016,36(12):1-4.
[3]贺小庆,凌同华,曹峰.基于FLAC~(3D)的采空区稳定性分析及处理研究[J].矿业研究与开发,2016,36(9):34-37.
[4]王成,纪晓飞,张建伟,等.急倾斜极厚大矿体矿柱回收方法研究与应用[J].矿业研究与开发,2016,36(8):1-4.
[5]米继武,李永辉.隔一采一矿柱空场回采嗣后放顶处理空区数值分析[J].采矿技术,2015,15(6):55-59.
[6]倪彬,王少宾,刘晓明.基于Phase2围岩稳定性分析的采矿方案优选[J].矿冶工程,2014,34(4):25-29.
[7]党洁,张晨洁,郭生茂,等.隔离矿柱回采稳定性影响因素的正交试验分析[J].金属矿山,2014(5):24-26.
[8]邹龙,彭府华.金川二矿1150m水平矿柱回采稳定性数值计算研究[J].采矿技术,2014,14(3):39-41.
[9]刘涛,唐礼忠,郭生茂.矿山隔离矿柱回采稳定性分析及开采方案研究[J].金属矿山,2014(4):154-159.
[10]于世波,崔松,王湖鑫,等.残矿柱回收地压演变及岩体稳固性模拟研究[J].矿业研究与开发,2013,33(4):55-58+87.
[11]吴家平,胡永泉.天马山硫金矿床采空区矿柱回采工程研究与实践[J].金属矿山,2013(8):20-23.