Size distribution, morphology and fractal characteristics of brittle rock fragmentations by the impact loading effect

摘要: The dynamic fragmentation of three types brittle rock is examined in this paper by impact experiments using the split Hopkinson pressure bar system. generalized extreme value distribution used to characterize size fragments. results indicate that slate particles are shaped as a sheet, sandstone fragments appear irregular prisms, and granite fine grain. Granite specimen most easily broken followed slate. NUM-based cumulative frequency curve moves toward left stress increases. Fitted curves more intensive at section relatively small particle become sparser when sizes increase, contrary Moreover, aspect ratio smaller than other two specimens, even under simple conditions. Peak values probability density function fragment consistent with theoretical results. Fractal theory further study features. show fractal dimension increases increased stress, have within certain range. Additionally, also limited distribution, dominant decreases.