爆炸与冲击2025，Vol.45Issue(5)：1-14,14.DOI:10.11883/bzycj-2024-0214
冲击荷载下含铜矿岩能量耗散的数值模拟
Numerical modeling of the energy dissipation and fragmentation of copper-bearing rock under impact load
摘要
Abstract
To understand the relationship between fragmentation and energy dissipation in copper-bearing ore rock subjected to impact loading,a split Hopkinson pressure bar(SHPB)testing apparatus was employed to study the mechanical properties and energy transfer mechanisms of copper-bearing tuff under varying impact loads.Additionally,fractal theory was used to establish the correlation between dissipated energy and rock fragmentation.Utilizing the finite discrete element method(FDEM),numerical simulations of crack propagation within the rock were conducted.The results indicate that as the incident energy increases,the distribution patterns of the transmission energy,dissipated energy and reflection energy remain consistent,which are characterized by transmission energy,dissipated energy and reflection energy decreased successively.Furthermore,significant variations in fragment size distribution are observed with changes in dissipated energy.Specifically,as dissipated energy increases from 19.52 J to 105.72 J,the average fragment size decreases from 27.98 mm to 16.94 mm,while the fractal dimension increases by 26.43%.This suggests that higher dissipated energy results in more extensive macroscopic fragmentation,an increase in the number of fragments,smaller particle sizes and enhanced uniformity.As the impact load intensifies,the time to crack initiation decreases,and the proportion of tensile cracks relative to total cracks increases.The application of the FDEM offers new insights into the fracture and failure characteristics of rocks.关键词
分离式霍普金森压杆/含铜矿岩/破碎块度/分形维数/能量耗散/有限离散元Key words
split Hopkinson pressure bar/copper-bearing rock/fragmentation/fractal dimension/energy dissipation/finite discrete element method分类
力学引用本文复制引用
左庭,李祥龙,王建国,胡启文,陶子豪,胡涛,章彬彬,宋家旺..冲击荷载下含铜矿岩能量耗散的数值模拟[J].爆炸与冲击,2025,45(5):1-14,14.基金项目
国家自然科学基金(52274083) （52274083）
云南省重大科技专项(202202AG050014) （202202AG050014）
云南省基础研究计划面上项目(202201AT070178) （202201AT070178）
浙江省自然资源科技项目(2024ZJDZ026) （2024ZJDZ026）
