工程爆破

2016, v.22(04) 61-66

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Sino露天磁铁矿台阶爆破方案的确定
Bench blasting scheme of Sino open-pit magnetite mine determination

李佳;唐强;熊晓峰;代双成;张煜;刘钰;
LI Jia;TANG Qiang;XIONG Xiao-feng;DAI Shuang-cheng;ZHANG Yu;LIU Yu;School of Resources and Safety Engineering,China University of Mining & Technology;

摘要(Abstract):

为确定澳大利亚Sino露天磁铁矿台阶爆破的排距和孔距,运用Holmberg&Person公式对钻孔爆破岩体损伤范围进行估算,通过迭代法确定椭圆损伤区的长短轴长度。使用动力分析软件LS-DYNA模拟5.5m(排距)×5.5m(孔距)、5.0m(排距)×6.0m(孔距)两种网孔布置方案的岩体破碎效果,结果表明:采用5.5m×5.5m方案时,炮孔之间存在未损伤区,易产生大块,后排孔起爆后出现应力集中现象。采用5.0m×6.0m方案时,爆破能量利用均匀,岩体破碎充分,是比较合理的排距、孔距参数,该方案应用于澳大利亚Sino露天磁铁矿台阶爆破,取得了良好的爆破效果。
In order to determine the row spacing and the hole spacing of bench blasting in Sino open-pit magnetite mine in Australia,Holmberg & Person formula was used to estimate the blast-induced damage zone and iteration method was used to determine the major axis and minor axis of the ellipse damage zone.LS-DYNA software was used to simulate the crushing effect of two different blasting schemes,which were 5.5m×5.5mand 5.0m×6.0m(row spacing×hole spacing).According to the simulation results,while the 5.5m×5.5mblasting scheme was used,there was no damage range between holes,boulders were easily formed,and stress concentration appeared after initiation of the second blastholes.While the 5.0m×6.0m blasting scheme was used,blasting energy was uniform and rock mass were fully broken,which indicated that it′s a reasonable blasting scheme.It was applied in Sino open-pit magnetite mine and a good result was achieved.

关键词(KeyWords): 台阶爆破;爆破方案;排距;孔距;损伤范围;LS-DYNA
Bench blasting;Blasting scheme;Row spacing;Hole spacing;Damage zone;LS-DYNA

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费资助项目(2011YZ05)

作者(Authors): 李佳;唐强;熊晓峰;代双成;张煜;刘钰;
LI Jia;TANG Qiang;XIONG Xiao-feng;DAI Shuang-cheng;ZHANG Yu;LIU Yu;School of Resources and Safety Engineering,China University of Mining & Technology;

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