Study on damage characteristics of iron ore under variable line density charge structure blasting  

作　　者：Xinmin Ma Yiyin Hu Xinshuo Li Yongsheng Ruan Yuan Jin Wenqing Yang 

机构地区：[1]School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China

出　　处：《Rock Mechanics Bulletin》2024年第4期1-14,共14页岩石力学通报（英文）

基　　金：Financial support for this work is provided by National Natural Science Foundation of China:52074301 and Supported by Key projects of National Natural Science Foundation of China:51934001.

摘　　要：Blasting test research was conducted on iron ore specimens with variable line density charging structures.Computer tomography(CT),digital image processing,and three-dimensional model reconstruction techniques were used to analyze the damage characteristics of iron ore specimens after blasting based on the calculated number of box dimensions.The results show that increasing the variable line density section charge uncoupling coefficient reduces the overall damage to the specimen by up to 1.73%,indicating that the overall damage size negatively correlates with the size of the variable line density section charge uncoupling coefficient.The damage characteristics of iron ore specimens from different layers(uncoupled charging section,transition section,coupled charging section)have some variability;when the uncoupling coefficient of the uncoupled charging section was reduced,the uncoupled section of the center of the damaged layer increased and then reduced.In contrast,the transition section shows a trend of increase,and the coupled section shows a minor difference,fully demonstrating the change in the variable line density section of the uncoupling coefficient of the specimen blasting damage effects.This study concludes that in the actual blasting project,choosing a reasonable variable line charge density structure can make the release of explosive blast energy more uniform to efficiently and thoroughly use explosive power to improve the iron ore crushing effect.

关 键 词：Iron ore BLASTING Variable line density charges Damage characterization 

分 类 号：TD235[矿业工程—矿井建设] TD861.1