岩土工程学报2017，Vol.39Issue(1)：62-70,9.DOI:10.11779/CJGE201701004
三维离散元大尺度模拟中变粒径方法的优化及其应用
Refinement andapplication ofvariable particle-sizemethodsin 3D discrete element modelling forlarge-scale problems
摘要
Abstract
A refinement methodis proposed to solve the differenceinthe macroscopic elasticity and the interpenetrationin interface area between different particle-size areas in the DEM. In simulations of3D DEM large-scale problems,small ballsare used in the near field core area tosimulate the real soil, while the far field boundary regionsare filled with larger balls.In addition, a mixed areais set between different particle-size areas with the same relative density.The number of particles in the model can bereduced enormously,whichimproves largelythecalculation efficiency. For scaling particle systems,the scale relationshipis established on the static condition by the identical macro elasticity of uniform granules. The relationship satisfies the consistency of stress, strain and strain energy. The results of a series of triaxial test simulations verify the uniformity of macro elasticity. A method to generate a certain density mixture with two different particle sizesis proposed. The results of DEM simulations illustrate that the deformation property of mixed area is consistent with that of the uniform particles. Finally, the results of cone penetration test simulations show that theproposedmethod is effective. This studymayprovide a new approach to the application of3D discrete element modelling in the large-scale geotechnical engineering.关键词
离散元模拟/变粒径/弹性常数/尺度关系/相对密实度/静力触探Key words
discrete elementmodeling/variable particle-size/elastic constant/scaling law/relative density/CPT分类
建筑与水利引用本文复制引用
邓益兵,杨彦骋,史旦达,刘文白..三维离散元大尺度模拟中变粒径方法的优化及其应用[J].岩土工程学报,2017,39(1):62-70,9.基金项目
国家自然科学基金青年基金项目（51208294）；上海市教委一流学科建设项目；2013年上海市研究生教育创新计划实施项目（20131129）；上海市教委科研创新项目（15ZZ081）；上海海事大学学术创新团队 （）
