复杂条件下隔离矿柱回采的稳定性分析
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摘要
以某矿隔离矿柱回采为工程背景,采用数值模拟和相似材料试验两种方法对崩落法采场和充填法采场之间隔离矿柱回采过程中的稳定性进行精细分析。研究表明,随着采空区宽度的增加,采场中应力逐渐向留设条形矿柱中进行转移,随着条形矿柱宽度的缩小,稳定性逐渐变差,当条形矿柱宽度为2.5 m和3 m时,条形矿柱及采场整体稳定性较好,兼顾回收率与稳定性,预留条形矿柱宽度为2.5 m是合适的。空区回填后,条形矿柱中的应力值有大幅的下降,而崩落法采场、充填法采场及顶板中的应力充填前后基本不变,回填后充填体能起到良好的支撑作用,而充填法采场和崩落法采场中应力分布不受充填体的影响。
On the basis of the mining background of a mine isolated pillar, the numerical simulation and similar material test are used to analyze the stability of the isolated pillar during the recovery process between the caving method and the filling method. The study shows that with the increase of the width of the goaf, the stress in the stope gradually shifts to the retained strip-shaped pillar. As the width of the strip-shaped pillar decreases, the stability gradually deteriorates. When the height is 2.5 m and 3 m, the overall stability of the strip pillar and the stope is good,taking into account the recovery rate and stability. It is suitable to reserve the width of the strip column of 2.5 m.After the empty area is backfilled, the stress value in the strip column is greatly reduced. And the stress values in caving stope, filling stope and roof are basically unchanged before and after filling, because the backfill can play a good supporting role after backfilling. The stress distribution in in caving stope and filling stope are not affected by the filling body. The research results have practical promotion significance for the recovery of similar mineral resources and the promotion of sustainable development of enterprises.
On the basis of the mining background of a mine isolated pillar, the numerical simulation and similar material test are used to analyze the stability of the isolated pillar during the recovery process between the caving method and the filling method. The study shows that with the increase of the width of the goaf, the stress in the stope gradually shifts to the retained strip-shaped pillar. As the width of the strip-shaped pillar decreases, the stability gradually deteriorates. When the height is 2.5 m and 3 m, the overall stability of the strip pillar and the stope is good,taking into account the recovery rate and stability. It is suitable to reserve the width of the strip column of 2.5 m.After the empty area is backfilled, the stress value in the strip column is greatly reduced. And the stress values in caving stope, filling stope and roof are basically unchanged before and after filling, because the backfill can play a good supporting role after backfilling. The stress distribution in in caving stope and filling stope are not affected by the filling body. The research results have practical promotion significance for the recovery of similar mineral resources and the promotion of sustainable development of enterprises.
引文
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[4]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.LIU Tao,TANG Lizhong,GUO Shengmao.Stability analysis and mining method of isolated pillar stoping[J].Metal Ming,2014(4):154-159.
[5]任少峰,褚夫蛟,宋华,等.采矿方法转变中的隔离矿柱稳定性分析[J].金属矿山,2013(4):71-73.REN Shaofeng,CHU Fujiao,SONG Hua,et al.Stability analysis of insulating pillar in the process of mining method change[J].Metal Ming,2013(4):71-73.
[6]胡建华,阮德修,周科平,等.基于空区结构效应的残矿开采作业环境安全辨识与协同利用[J].中南大学学报(自然科学版),2013,44(3):1122-1130.HU Jianhua,RUAN Dexiu,ZHOU Keping,et al.Identification and synergic use of operating environment safety based on structure effect of goafs in residual mining[J].Journal of Central South University(Science and Technology),2013,44(3):1122-1130.
[7]VOLCHENKO G N,SERYAKOV V M,FRYANOV V N.Geomechanical substantiation of the resource-saving alternatives of the induced block caving method[J].Journal of Mining Science,2012,48(4):709-716.
[8]朱鹏瑞,李文超,许国良,等,联合开采矿山矿柱回采可行性分析及回采方案研究[J].黄金,2018,39(8):33-37.ZHU Pengrui,LI Wenchao,XU Guoliang,et al.Feasibility analysis and engineering practice of isolation pillar extraction[J]Gold,2018,39(8):33-37.
[9]董鑫,吴锋,彭建平,等.夏甸金矿崩落空区隔离矿柱开采研究[J].矿业研究与开发,2018,39(9):1-5.DONG Xin,WU Feng,PENG Jianping,et al.Study on isolation pillar minging in the caving empty area of the Xiadian gold mine[J]Minging R&D,2018,39(9):1-5.
[10]REN Gaofeng,FANG Xingkui.Study on the law of mining damage with the combination of underground mining and open-pit mining[C].International Conference on Bioinformatics&Biomedical Engineering.IEEE,2010.
[11]苏仲杰,于广明,杨伦.覆岩离层变形力学机理数值模拟研究[J].岩石力学与工程学报,2003,22(8):1287-1290.SU Zhongjie,YU Guangming,YANG Lun.Overburdens numerical simulation of deformation mechanism mechanics[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(8):1287-1290.