摘要
颗粒物质在自然界和人类生产与生活中广泛存在,对于非规则颗粒,其宏观物理力学特性与几何形态密切相关.本文以本课题组和合作者的相关研究为基础,介绍了非规则颗粒几何形态的获取、重构、评价、随机生成以及离散元模拟方法等方面的研究进展.总结了非规则颗粒形态不同获取方法的优缺点;将颗粒二维形态和三维形态分别划分为星形和非星形两种类型,介绍了各类型几何形态的计算几何重构方法;系统总结了非规则颗粒不同层次形态评价指标的定义,及基于计算几何的指标计算方法;介绍了基于逆蒙特卡罗法的二维星形与三维星形随机颗粒生成方法,以及可考虑一阶系数固有关系和其他阶系数经验相关性的二维非星形与三维非星形虚拟颗粒生成方法;对于非规则颗粒的离散元模拟方法,重点总结了颗粒几何形态表示、颗粒接触判断与颗粒接触力计算方法等核心问题的研究进展.
Granular materials widely exist in nature,industry,and human life.The physicomechanical characteristics of irregular particles are closely related to their geometry morphology.This paper summarizes the relevant studies performed by our research group and collaborators.The research progress in image acquisition,geometric reconstruction,morphological characterization,random generation,and discrete element modeling of irregular particles is presented.In addition,the advantages and disadvantages of different methods for the image acquisition of irregular particles are summarized.Two-and three-dimensional general-shape particles are divided into two categories,namely star-and nonstar-like particles.The computational geometric methods for the morphological reconstruction of the particles in each category are introduced.Moreover,the definitions and calculation formulas for the morphological evaluation indices of irregular particles are systematically summarized.The random generation method for the starlike particles based on the inverse Monte Carlo method and that for the nonstar-like particles are introduced considering the inherent relationship of the first-order coefficients and the empirical correlation between the coefficients at different orders.For the discrete element modeling methods of irregular particles,the progress on the core issues,such as geometric representation,contact detection,and contact law,is summarized.
作者
苏栋
樊猛
王翔
陈湘生
SU Dong;FAN Meng;WANG Xiang;CHEN XiangSheng(Cllege of Civil and Transportation Engineering,Shenzhen University Shenzhen 518060,China;Key Laboraoyfor Resilient Infrastructures of Coastal Cities(Shenzhen University),MinistryofEducation,Shenzhen University,Shenzhen China;Shenzhen Key Laboratory of Green,Eficient and Intelligent Construction of Underground Metro Station,Shenzhen University,Shenzhen 518060,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2023年第11期1847-1870,共24页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:51938008,51878416,52090081)资助项目。
关键词
非规则颗粒
几何形态
非星形
形态评价指标
颗粒随机生成
离散元模拟
接触法则
irregular particle
geometric shape
nonstar-like particle
morphological evaluation index
particle random generation
discrete element method
contact law
