爆破2025，Vol.42Issue(2)：52-59,8.DOI:10.3963/j.issn.1001-487X.2025.02.006
冲击荷载下磁铁矿动力学特性及破坏特征研究
Study on Dynamic Characteristics and Failure Characteristics of Magnetite under Impact Load
摘要
Abstract
To investigate the energy evolution and failure patterns of magnetite during blasting and to minimize the impact of blasting disturbances on the stability of pillars and surrounding rocks,a series of multi-stage strength impact tests were conducted on magnetite samples using a Split Hopkinson pressure bar(SHPB)apparatus.The dy-namic response characteristics of magnetite were analyzed,focusing on parameters such as dynamic peak compressive strength,failure modes,fragmentation size,and energy dissipation density under varying strain rates.The results show that magnetite's dynamic peak compressive strength and energy dissipation density increase exponentially with the in-crease in strain rate.At the same time,the crushing size decreases exponentially,demonstrating a strong strain-rate dependency.The failure process of magnetite can be divided into three stages:crack compaction,elastic deformation,and crushing.The dynamic increase factor(DIF)also increases with the increase in strain rate.The failure mode of magnetite transitions from splitting failure at lower strain rates to crushing failure at higher strain rates as crack inter-actions intensify.Therefore,when blasting rock breaking is applied to magnetite mining,it is crucial to balance impact strength and energy dissipation to enhance crushing efficiency while meeting the required fragmentation standards.关键词
磁铁矿/分离式霍普金森压杆(SHPB)/动态峰值抗压强度/破坏形态/能量耗散/应变率效应Key words
magnetite/SHPB/dynamic peak compressive strength/destruction form/energy dissipation/strain rate effect分类
矿业与冶金引用本文复制引用
牛俊超,李吉民,梅林芳,任高峰,葛永翔,张聪瑞,鲁习奎,赵亮,SATIMIN NOER REFKY ADI NATA..冲击荷载下磁铁矿动力学特性及破坏特征研究[J].爆破,2025,42(2):52-59,8.基金项目
国家自然科学基金(52174087)硬石膏矿空区群灾变链断链控制及精细化开发时空原理研究 National Natural Science Foundation of China(52174087)Study on control mechanism of disasters chain-scission and fine devel-opment of underground goaf masses in hard gypsum mine （52174087）
