湖南农业大学学报（自然科学版）2018，Vol.44Issue(2)：216-220,5.DOI:10.13331/j.cnki.jhau.2018.02.019
基于堆积试验的壤土离散元参数的标定
Parameters calibration of loam soil for discrete element simulation based on the repose angle of particle heap
摘要
Abstract
A contact model for discrete element simulation was established to obtain the physical parameters and contact mechanical parameters of viscoelasticity loam soil particlesin southern region. Take the loam soil which test measured soil repose angel 40.95° as study object, chosen Hertz–Mindlin with JKR as contact model, the loam soil physical parameters was obtained by experiment. The steepest ascent test was used to obtain the optimum contact mechanics parameters by means of soil contact mechanic parameters primary select range in GEMM database. Design–expert software was used to carry out 4 factor 3 horizontal quadrature rotation combination test to obtain repose angel regression model. The variance analysis result showed that the optimization combination parameters as follow: JKR surface energy was 13.05 J/m2, recovery coefficient was 0.5, rolling friction coefficient was 0.15, static friction coefficient was 1.06 when the actual measurement repose angle was selected as target of 40.95°. The simulated mean repose angle was 41.07 ° by using best combination parameters. The repose angle value error was 0.3% compared with actual measurement value.关键词
壤土/堆积角/离散元法/参数标定/接触模型Key words
loam soil/repose angle/discrete element method/parameters calibration/contact model分类
农业科技引用本文复制引用
贺一鸣,向伟,吴明亮,全伟,陈超鹏..基于堆积试验的壤土离散元参数的标定[J].湖南农业大学学报（自然科学版）,2018,44(2):216-220,5.基金项目
湖南省政府重大专项(湘府阅[2014]35号) （湘府阅[2014]35号）
湖南省科学技术厅项目(2016NK2015,2017NK2131) （2016NK2015,2017NK2131）
