长安金矿1201-1205采场中深孔落矿工艺及参数优化试验  

Optimization Test of Medium Deep Hole Caving Parameters in 1201-1205 Stope of Chang'an Gold Mine

作　　者：许敏捷 周宗红[2] 高旭辉 刘永文 周晓军 XU Minjie;ZHOU Zonghong;GAO Xuhui;LIU Yongwen;ZHOU Xiaojun(Yunnan Gold Group Jinping Changan Mining Co.,Ltd.;College of Land and Resources Engineering,Kunming University of Science and Technology;Yunnan Gold Group Yunnan Mine Construction Engineering Co.,Ltd.)

机构地区：[1]云南黄金集团金平长安矿业有限公司 [2]昆明理工大学国土资源工程学院 [3]云南黄金集团云南地矿建设工程有限责任公司

出　　处：《现代矿业》2021年第2期37-39,43,共4页Modern Mining

摘　　要：长安金矿露天转地下开采,1500 m首采中段采用无底柱分段崩落法。为解决中深孔落矿存在眉线破坏严重、隔墙、炸药单耗高等问题,在现场调查及理论分析的基础上,结合岩体力学实验结果,优化凿岩爆破参数、提高中深孔施工质量,改进装药和爆破工艺。确定炸药单耗为0.8kg/m3,取消了孔内敷设的导爆索,采用微差爆破、孔底起爆、孔口交错装药,并采用之字形装药,装药系数由0.83降低到0.72~0.75,降低爆破振动对眉线的影响。现场试验取得了良好的效果,采场矿石回采率87%,贫化率25%,大块率9%,一次炸药单耗为0.38 kg/t,显著改善了爆破质量、降低了装药单耗,为中深孔落矿在长安金矿的应用打下了良好的基础。Chang'an Gold Mine is converted from open-pit to underground mining,and the first min⁃ing level of 1500 m is adopted by non-pillar sublevel caving method.In order to solve the problems of seri⁃ous eyebrow line damage,partition wall and high explosive consumption in medium and deep hole caving,based on field investigation and theoretical analysis,combined with the results of rock mechanics experi⁃ment,the drilling blasting parameters are optimized,the construction quality of medium and deep hole is improved,and the charge and blasting technology are improved.The unit consumption of explosive was de⁃termined to be 0.8 kg/m3,and the detonating cord laid in the hole was canceled.The millisecond blasting,hole bottom initiation,hole mouth staggered charge were adopted,and the zigzag charge was adopted.The charge coefficient was reduced from 0.83 to 0.72~0.75,and the influence of blasting vibration on the eye⁃brow line was reduced.The field test has achieved good results.The stope ore recovery rate is 87%,the di⁃lution rate is 25%,the bulk rate is 9%,and the unit consumption of primary explosive is 0.38 kg/t,which significantly improves the blasting quality and reduces the unit consumption of charge,and lays a good foundation for the application of medium and deep hole caving in Chang'an Gold Mine.

关 键 词：落矿参数 眉线破坏 孔底起爆 装药系数 微差爆破 

分 类 号：TD853.31[矿业工程—金属矿开采]