计算力学学报2017，Vol.34Issue(6)：755-762,8.DOI:10.7511/jslx201706012
无胶结材料的离散元微观参数交互作用研究
Investigation on interaction of microscopic parameters of cohesioness granular material via DEM
摘要
Abstract
In order to investigate the interaction of microscopic parameters of cohesioness granular materials,rolling resistance contact model was employed in triaxial compression test with different microscopic parameters via the Discrete Element Method.In this simulation,five microscopic parameters were adopted,namely,contact stiffness ratio α =ks/kn (0.3 ～ 0.9),coefficient of rolling stiffness3(0.1～3),normal stiffness kn (1 × 107 ～7 × 107),internal friction angle θ (10 ～ 40) and coefficient of plastic moment η(0.1～3),respectively.Meanwhile,parametric studies on five macroscopic parameters,namely,peak stress σp,residual strength σr,Young's modulus E,Poisson's ratio ν and friction angle φ were made.Firstly,comprehensive and factorial experiment design were carried out to conduct a qualitative analysis on the interaction between microscopic parameters and macroscopic parameters,and then multiple nonlinear regression was adopted to analyze the interaction quantitatively.A theoretical formula between macroscopic and microscopic parameters was proposed also,taking the interaction into consideration.The result shows that:(1) Particle internal friction angle and rolling resistance parameters have a significant influence on macroscopic strength parameters,and its deformation parameters are mainly determined by particle contact stiffness and contact stiffness ratio;(2) There are interactions between microscopic parameters and macroscopic parameters at different degrees,which have certain effects on the samples macroscopic properties;(3) As to peak stress,residual stress and internal friction angle,the interactions between two rolling resistance parameters,as well as rolling resistance parameters and particle friction angle are relatively strong.Furthermore,there is a significant interaction between normal contact stiffness and other parameters,which has an influence on Young's modulus and Poisson's ratio.The study contributes to quickly and reasonably determine the microscopic parameters of DEM model.关键词
离散单元法/抗转动/微观参数/交互作用/析因试验设计Key words
discrete element method/rolling resistance/microscopic parameters/interaction/factorial experiment design分类
建筑与水利引用本文复制引用
王智超,旷杜敏,赵涛..无胶结材料的离散元微观参数交互作用研究[J].计算力学学报,2017,34(6):755-762,8.基金项目
国家自然科学基金(51308485) （51308485）
湖南省自然科学基金(2016JJ2133) （2016JJ2133）
地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2016K022)资助项目. （SKLGP2016K022）
