岩土力学2017，Vol.38Issue(7)：2119-2127,9.DOI:10.16285/j.rsm.2017.07.036
颗粒破碎的三维离散元模拟研究
3D numerical simulation of particle breakage using discrete element method
摘要
Abstract
Discrete element method (DEM),such as particle flow code (PFC),has become one of the current highlights to investigate the particle breakage process in the geotechnical field.In this study,based on the point load crushing criterion considering the local stress concentration,a three-dimensional (3D) particle crushing model was established.Particually,the particle balance among particles before and after crushing is ensured by the Apollo filling and expansion method,and a size effect factor is used to characterize strength of particles with different sizes.Then,numerical simulations were performed on three types of sand with different degrees of breakage,namely silica sand,calcareous sand and Sacramento River sand.The comparisons of numerical and experimental results show that the established model can well describe compressive properties of granular materials with different degrees of breakage.Comparing with the failure criterion rooted in Mohr-Coulomb theory on the basis of mean stress,the criterion in the established model shows a better manner in reflecting the real fragmentation phenomena under the same loading condition.At the same time,the established model reveals the influence of crushing on the anisotropic dissipation and gradation evolution of granular materials.关键词
颗粒破碎/离散元法/多代子颗粒/破碎准则Key words
particle breakage/discrete element method/multi-generations of particles/crushing criterion分类
建筑与水利引用本文复制引用
张科芬,张升,滕继东,盛岱超..颗粒破碎的三维离散元模拟研究[J].岩土力学,2017,38(7):2119-2127,9.基金项目
国家重点基础研究发展计划(973)项目(No.2014CB047001) （973）
国家自然科学基金项目(No.41340012,No.51508578).This work was supported by the National Basic Research Program of China (973 Program) (2014CB047001) and the National Natural Science Foundation of China (41340012,51508578). （No.41340012,No.51508578）
