石禄铁矿扇形中深孔爆破块度分布特征研究  

Study on the distribution characteristics of deep hole blasting in the fan-shaped hole of Shilu Iron Mine

作　　者：骆浩浩 杨仁树 马鑫民[1] 杨国梁[1] 朱培枭 冯文宇 LUO Haohao;YANG Renshu;MA Xinmin;YANG Guoliang;ZHU Peixiao;FENG Wenyu(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《采矿与安全工程学报》2023年第2期371-378,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51804310)。

摘　　要：为优化扇形中深孔爆破块度分布,进行9次扇形孔爆破现场试验,采用数字图像处理软件Split-Desk 4.0对爆堆进行图像处理,通过线性拟合得到爆破块度分布预测模型,并计算对应爆堆的分形维数。试验结果表明:微差爆破有利于控制大块率,对扇形孔孔口进行间隔装药,有利于降低中深孔爆破粉矿率。数值模拟结果显示,孔底有效峰值应力<中间有效峰值应力<孔口有效峰值应力,容易在孔底产生大块,孔口产生粉矿。通过调整中深孔爆破合理孔间延期时间、扇形孔孔口装药结构,对中深孔爆破块度分布进行有效控制,有利于提高石禄铁矿的生产效率,间接提高石禄井下铁矿经济效益。In order to optimize the blasting block degree distribution of fan-shaped medium and deep holes,nine field tests of fan-shaped hole blasting are carried out.The digital image processing software Split-Desk 4.0 is used to process the image of the blasting pile,and the blasting block degree is obtained by linear fitting.The distribution prediction model and the fractal dimension of the corresponding explosion piles are calculated.The test results show that the differential blasting is beneficial to control the bulk rate,and the interval charging of the fan-shaped orifice is beneficial to reduce the blasting powder rate of medium and deep holes.The numerical simulation results show that the effective peak stress at the bottom of the hole<the effective peak stress in the middle<the effective peak stress at the orifice.It is easy to generate boulders at the bottom of the hole and powder ore at the orifice.By adjusting the reasonable delay time between holes in medium and deep hole blasting and the charge structure of the fanshaped hole,the size distribution of medium and deep hole blasting can be effectively controlled,which is beneficial to improve the production efficiency of Shilu Iron Mine and indirectly improve its economic performance.

关 键 词：爆破块度 分型维数 GGS模型 粉矿率 大块率 

分 类 号：TD823[矿业工程—煤矿开采]