FENG Xingbo, XI Yue, SONG Danqing, XU Yongfu. 2016: PFC2D BASED FRACTAL MODEL FOR TENSILE STRENGTH AND BREAKAGE ENERGY OF ROCK PARTICLE CRUSHING. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 629-634. DOI: 10.13544/j.cnki.jeg.2016.04.019
    Citation: FENG Xingbo, XI Yue, SONG Danqing, XU Yongfu. 2016: PFC2D BASED FRACTAL MODEL FOR TENSILE STRENGTH AND BREAKAGE ENERGY OF ROCK PARTICLE CRUSHING. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 629-634. DOI: 10.13544/j.cnki.jeg.2016.04.019

    PFC2D BASED FRACTAL MODEL FOR TENSILE STRENGTH AND BREAKAGE ENERGY OF ROCK PARTICLE CRUSHING

    • The tensile strength is not independent of fragment size, but decreases with increasing size known as "size effect". Recent developments in fractal theory suggest that fractal model may provide a more realistic representation of solid particle crushing. A fractal model for crushing of rock particle is constructed using the Sammis model. The relationship between crushing strength and diameter and the relationship between crushing power and diameter of rock particle are simulated respectively. The porosity equals to 0.12 and 0.3 of rock particles, which are simulated using the bonded particle model(BPM) in particle flow code(PFC2D). The relationship between crushing strength and diameter of particle is verified and can be expressed by σfdD-3. A relationship between crushing power and diameter of rock particle is expressed by EfdD-1. The good application of fractal theory in the analysis of particle size effect in fractured rock is verified and the results provide a reference for determination of crushing strength.
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