降低至 <img src="/qkimages/bd4c/bd4c202505/bd4c20250506-2-l.jpg" with="64px" style="vertical-align: middle;"> ,分形維數(shù)提升了 2 6 . 4 3 % ,表明耗散能越高,礦巖的宏觀破碎程度越劇烈,破碎塊度的數(shù)目越多,碎塊粒徑越小,均勻性越好;隨著沖擊荷載的增大,裂紋起裂時間縮短,拉伸裂紋數(shù)量占總裂紋數(shù)量的比重提高。FDEM數(shù)值計算方法的應(yīng)用可為深入解析巖石斷裂破壞特性提供新的思路。-龍源期刊網(wǎng)" />

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沖擊荷載下含銅礦巖能量耗散的數(shù)值模擬

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中圖分類號:0346.1 國標(biāo)學(xué)科代碼:13015 文獻(xiàn)標(biāo)志碼: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

銅作為生產(chǎn)生活中應(yīng)用最廣泛的金屬之一,在國民經(jīng)濟(jì)建設(shè)中發(fā)揮著重要作用[1]。(剩余20314字)

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