降低海峰露天矿矿山爆破大块率的方法  

Methods on reducing the blasting bulk rate of Haifeng Open-pit Mine

作　　者：宋凡平 刘明峰 牛华铭 陈坤 陈建安 胡坤伦 SONG Fanping;LIU Mingfeng;NIU Huamig;CHEN Kun;CHEN Jian'an;HU Kunlun(Anhui Jiangnan Blasting Engineering Co.,Ltd.,Ningguo 242300,China)

机构地区：[1]安徽江南爆破工程有限公司,安徽宁国242300

出　　处：《露天采矿技术》2025年第1期75-79,共5页Opencast Mining Technology

摘　　要：为解决安徽省宣城市海峰矿山爆破效果差、大块率高及根底多等问题,首先从台阶坡面、顶部及底部3个方面分析了爆破大块生成机理,并给出了降低大块率的设计及施工方法,再通过重新设计孔排距等参数、改良装药结构的现场实验进行验证。试验结果表明:大孔距小排距的孔网参数、错峰间隔装药结构及“V”形起爆法可有效控制爆破大块率,对爆破效果的提升十分显著;海峰矿山平均大块率从5.2%降至1.1%,二次破碎成本从0.35元/t降至0.11元/t,实现了降本增效的生产目标。In order to solve the problems such as poor blasting effect,high bulk rate and multiple foundation of Haifeng Mine in Xuancheng City,Anhui Province,the article first analyzes the formation mechanism of blasting bulk from the three aspects of step slope,top and bottom,and gives the design and construction methods for reducing the bulk rate.Then we carry out the field experiment to verify the parameters such as re-designing hole row spacing and improving the charge structure.The experimental results show that the hole mesh parameters with large hole spacing and small row spacing,the structure of staggered peak interval charge and the"V"shape initiation method can effectively control the blasting bulk rate and improve the blasting effect significantly.The average bulk rate of Haifeng Mine is reduced from 5.2%to 1.1%,and the secondary crushing cost is reduced from 0.35 yuan/t to 0.11 yuan/t,achieving the production target of cost reduction and efficiency increase.

关 键 词：露天矿 大块率 二次破碎 根底 孔网参数 

分 类 号：TD824.2[矿业工程—煤矿开采]