冲击荷载下含铜矿岩能量耗散的数值模拟

打开文本图片集

中图分类号：0346.1 国标学科代码：13015 文献标志码：A

Abstract：Tounderstand therelationship between fragmentationand energy dissipationincopper-bearing orerock subjected to impactloading，a split Hopkinson pressurebar （SHPB）testing apparatus was employed to studythe mechanical properties and energy transfer mechanisms ofcopper-bearing tuff under varying impact loads.Additionally，fractal theory was used to establish thecorrelation between disipatedenergyandrock fragmentation.Utilizing the finite discreteelementmethod （FDEM），numericalsimulationsofcrack propagation withintherock wereconducted.Theresultsindicatethatastheincident energy increases，the distribution pattemsof the transmissionenergy，disipatedenergyandreflectionenergyremain consistent，whicharecharacterizedbytransmissioneergy，disipatedenergyandreflectionenergydecreasedsuccesively. Furthermore，significant variations infragment size distributionarebserved withchanges indisipatedenergy.Specificall，as dissipated energy increases from 19.52 J to 105.72 J， the average fragment size decreases from to ，while the fractal dimension increasesby 2 6 . 4 3 % .Thissuggests that higher dissipated energy results inmore extensive macroscopic fragmentation，an increasein the numberoffragments，smaler particle sizes and enhanced uniformity.Asthe impactload intensifies，thetimetocrack initiationdecreases，andtheproportionoftensilecracksrelative tototalcracksincreass.The application of the FDEMoffers new insights into the fracture and failure characteristics of rocks.

Keywords：split Hopkinson pressre bar；copper-bearing rock；fragmentation； fractal dimension； energydisspation； finite discrete element method

铜作为生产生活中应用最广泛的金属之一，在国民经济建设中发挥着重要作用[1]。（剩余20314字）