镇沅金矿中深孔爆破参数数值模拟研究
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摘要
镇沅金矿一直采用无底柱分段崩落法进行回采,但爆破中存在大块率高、缩口比较严重等问题。为了确定合理的爆破参数,运用ANSYS/LS-DYNA数值模拟软件对扇形炮孔爆破过程进行数值模拟,再现扇形炮孔爆破应力场变化过程,分析了爆炸仿真过程中的Von Mises有效应力峰值,确定了中深孔爆破最优的最小抵抗线和最大孔底距,为中深孔爆破提供理论依据。并对此参数进行了现场试验,现场中深孔爆破后,爆破效果良好,进一步证明了所确定的最小抵抗线为1.5 m,最大孔底距为2.0 m为最优爆破参数。
The non-pillar sublevel caving has been used in Zhenyuan Gold Mine.However,there are some problems such as high bulk rate and serious shrinkage.In order to determine reasonable blasting parameters,the numerical simulation of blasting process with fan-shaped borehole layout was studied by ANSYS/LS-DYNA.The change of the stress field for the blasting was obtained.The peak value of Von Mises effective stress during the explosion simulation was analyzed.The minimum burden and maximum hole bottom pitch of the blasting were determined.The research results can provide theoretical basis for industrial tests subsequently,and the blasting effect is very well.It is further proved that the minimum burden of 1.5 meters and the maximum hole bottom pitch of 2.0 meters are the optimal blasting parameters.
The non-pillar sublevel caving has been used in Zhenyuan Gold Mine.However,there are some problems such as high bulk rate and serious shrinkage.In order to determine reasonable blasting parameters,the numerical simulation of blasting process with fan-shaped borehole layout was studied by ANSYS/LS-DYNA.The change of the stress field for the blasting was obtained.The peak value of Von Mises effective stress during the explosion simulation was analyzed.The minimum burden and maximum hole bottom pitch of the blasting were determined.The research results can provide theoretical basis for industrial tests subsequently,and the blasting effect is very well.It is further proved that the minimum burden of 1.5 meters and the maximum hole bottom pitch of 2.0 meters are the optimal blasting parameters.
引文
[1] 柴修伟,张电吉,周文勇,等.厚大磷矿体井下中深孔爆破参数优化研究[J].爆破,2011,28(2):35-38.[1] CHAI Xiu-wei,ZHANG Dian-ji,ZHOU Wen-yong,et al.Research on blast parameters of mid-deep hole underground blasting in thick and large phosphorite[J].Blasting,2011,28(2):35-38.(in Chinese)
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[9] 李强,龙家安,盛佳.大直径深孔凿岩爆破参数优化研究[J].采矿技术,2012,12(5):71-72,87.[9] LI Qiang,LONG Jia-an,SHENG Jia.Optimization study on blasting parameters of large diameter deep hole drilling[J].Mining Technology,2012,12(5):71-72,87.(in Chinese)
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[11] 徐帅,彭建宇,李元辉,等.急倾斜薄矿脉中深孔落矿爆破参数优化[J].爆炸与冲击,2015,35(5):682-688.[11] XU Shuai,PENG Jian-yu,LI Yuan-hui,et al.Blasting parameter optimization of medium-depth hole caving for steeply inclined thin veins[J].Explosion and Shock Waves,2015,35(5):682-688.(in Chinese)
[12] 柴修伟,姚金蕊,赵勇,等.地下磷块岩深孔回采爆破参数优化[J].爆破,2014,31(4):54-57,75.[12] CHAI Xiu-wei,YAO Jin-rui,ZHAO Yong,et al.Optimization of longhole parameters of Stoping Blasting in underground Hard-to-mine ore body[J].Blasting,2014,31(4):54-57,75.(in Chinese)
[2] 杨才亮.单自由面无限岩体中深孔微差爆破数值模拟[J].矿业研究与开发,2010,30(4):93-96.[2] YANG Cai-liang.Numerical simulation of deep hole differential blasting in a single free surface infinite rock mass[J].Mining Research and Development,2010,30(4):93-96.(in Chinese)
[3] 任高峰,王威,冯海昀,等.融冠1号矿中深孔爆破参数优化研究[J].爆破,2011,28(3):34-35,38.[3] REN Gao-feng,WANG Wei,FENG Hai-yun,et al.Optimization study on mid-length hole blast parameters in Rongguan No.1 Mine[J] Blasting,2011,28(3):34-35,38.(in Chinese)
[4] 阎南.扇形中深孔爆破大块率与爆破参数的关系[J].中国矿山工程,2016,45(5):74-76,84.[4] YAN Nan.Relationship between boulder yield and parameters in the blasting with radial medium-length hole[J].China Mine Engineering,2016,45(5):74-76,84.(in Chinese)
[5] 潘淼昌,武永猛,史秀志,等.凡口铅锌矿扇形中深孔爆破参数数值模拟研究[J].采矿技术,2013,13(5):87-89,142.[5] PAN Miao-chang,WU Yong-meng,SHI Xiu-zhi,et al.Nnumerical simulation of deep hole blasting parameters inFanKou lead and zinc mine[J].Mining Technology,2013,13(5):87-89,142.(in Chinese)
[6] 钱七虎,戚承志.岩石、岩体的动力强度与动力破坏准则[J].同济大学学报(自然科学版),2008,36(12):1599-1605.[6] QIAN Qi-hu,QI Cheng-zhi.Dynamic strength and dynamic fracture criteria of rock and rock mass[J].Journal of Tongji University(Natural Science),2008,36(12):1599-1605.(in Chinese)
[7] 赵坚,李海波.莫尔-库仑和霍克-布朗强度准则用于评估脆性岩石动态强度的适用性[J].岩石力学与工程学报,2003(2):171-176.[7] ZHAO Jian,LI Hai-bo.Estimating the dynamic strength of rock using Mohr-coulomb and Hoek-Brown criteria[J].Chinese Journal of Rock Mechanics and Engineering,2003(2):171-176.(in Chinese)
[8] 邹洋.岩石动静组合加载巴西盘劈裂试验研究[D].长沙:中南大学,2011.[8] ZOU Yang.Experimental study of rock Briziling disk test under coupled static-dynamic loads[D].Changsha:Central South university.(in Chinese)
[9] 李强,龙家安,盛佳.大直径深孔凿岩爆破参数优化研究[J].采矿技术,2012,12(5):71-72,87.[9] LI Qiang,LONG Jia-an,SHENG Jia.Optimization study on blasting parameters of large diameter deep hole drilling[J].Mining Technology,2012,12(5):71-72,87.(in Chinese)
[10] 仲崇春,于长军,黄志国.无底柱分段崩落法回采参数数值研究[J].有色金属(矿山部分),2014,66(6):15-17.[10] ZHONG Chong-chun,YU Chang-jun,HUANG Zhi-guo.Numerical study on mining parameters of non-pillar sublevel caving method[J].Nonferrous Metals(Mining Section),2014,66(6):15-17.(in Chinese)
[11] 徐帅,彭建宇,李元辉,等.急倾斜薄矿脉中深孔落矿爆破参数优化[J].爆炸与冲击,2015,35(5):682-688.[11] XU Shuai,PENG Jian-yu,LI Yuan-hui,et al.Blasting parameter optimization of medium-depth hole caving for steeply inclined thin veins[J].Explosion and Shock Waves,2015,35(5):682-688.(in Chinese)
[12] 柴修伟,姚金蕊,赵勇,等.地下磷块岩深孔回采爆破参数优化[J].爆破,2014,31(4):54-57,75.[12] CHAI Xiu-wei,YAO Jin-rui,ZHAO Yong,et al.Optimization of longhole parameters of Stoping Blasting in underground Hard-to-mine ore body[J].Blasting,2014,31(4):54-57,75.(in Chinese)