工程地质学报2016，Vol.24Issue(4)：629-634,6.DOI:10.13544/j.cnki.jeg.2016.04.019
基于PFC2D岩石颗粒破碎强度和能量的分形模型
PFC2D BASED FRACTAL MODEL FOR TENSILE STRENGTH AND BREAKAGE ENERGY OF ROCK PARTICLE CRUSHING
摘要
Abstract
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. 1 2 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 σf∝dD-3 .A relationship between crushing power and diameter of rock particle is expressed by Ef∝ dD-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.关键词
PFC2D/岩石颗粒/破碎强度/破碎能量/分维Key words
PFC2D/Rock particle/Crushing strength/Breakage energy/Dimension分类
天文与地球科学引用本文复制引用
冯兴波,奚悦,宋丹青,徐永福..基于PFC2D岩石颗粒破碎强度和能量的分形模型[J].工程地质学报,2016,24(4):629-634,6.基金项目
国家自然科学基金项目(No41272318、41472251)资助． （No41272318、41472251）
