破碎矿体扇形深孔双点起爆位置优化研究  

Research on optimization of dual-point detonation positions in fan-shaped deep holes in broken ore bodies

作　　者：陆克勤 范子儀 杨阳 陈树林 马涛 朱锐 LU Ke-qin;FAN Zi-yi;YANG Yang;CHEN Shu-lin;MA Tao;ZHU Rui(School of Mechanics and Civil Engineering,China University of Mining&Technology,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology,Beijing 100083,China;Panzhihua Iron and Steel Group Mining Co.,Ltd.,Panzhihua 617067,Sichuan,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]北京科技大学土木与资源工程学院,北京100083 [3]攀钢集团矿业有限公司,四川攀枝花617067

出　　处：《工程爆破》2024年第4期58-66,共9页Engineering Blasting

基　　金：国家自然科学基金青年基金资助项目(52304078);北京市自然科学基金青年基金资助项目(8224086)。

摘　　要：在采用无底柱分段崩落法开采破碎矿体时,常常面临眉线破坏的问题,这一问题不仅影响后续爆破作业,还严重制约现场的安全高效生产。为解决这一问题,以尖山铁矿1280分段回采进路为工程背景,综合运用现场调研、数值模拟和理论分析等方法,研究双点起爆不同起爆位置下爆轰应力场的分布规律。综合评价不同起爆位置下爆炸能量的空间分布及爆破效果,发现适当调整起爆位置,可以调整爆轰应力场在矿体内部的分布规律,并降低对眉线口处应力作用。现场试验结果表明,当双点起爆时药包布置在装药段1/2~孔底位置,能够加强对顶部矿体的破坏作用,同时减弱对眉线口部位的影响,有效保护眉线。In the mining of fractured ore bodies using the sublevel caving method,brow failure is a common issue that not only affects subsequent blasting operations but also severely restricts safe and efficient production on site.To address this problem,a study was conducted using the 1280 sublevel recovery roadway of the Jiandashan Iron Mine as a case study.The research utilized field surveys,numerical simulations,and theoretical analysis to investigate the distribution pattern of detonation stress fields under different initiation points in double-point initiation.A comprehensive evaluation of the spatial distribution of explosion energy and blasting effectiveness under different initiation positions revealed that adjusting the initiation position appropriately can modify the distribution pattern of the detonation stress field within the ore body,thereby reducing the stress impact on the brow area.Field test results confirmed that when the charge is positioned at 1/2 of the charging section to the hole bottom during double-point initiation,it enhances the destructive effect on the upper ore body while mitigating the impact on the brow area,effectively protecting the brow.

关 键 词：无底柱分段崩落法 数值模拟 双点起爆 起爆位置 眉线破坏 

分 类 号：TD853[矿业工程—金属矿开采] TD235[矿业工程—矿山开采]