计算力学学报2017，Vol.34Issue(5)：615-622,8.DOI:10.7511/jslx201705013
铁路道砟破碎特性的离散元分析
Discrete element analysis of breakage characteristics of railway ballast
摘要
Abstract
It is necessary to investigate the breakage characteristics of railway ballast to reduce the maintenance cost and to improve the travelling comfort of trains running on ballasted railway track .In this study ,the mechanical test method was developed to measure the effective compressive strength of ballast particles .During the physical experiment ,the force and the displacement of ballast samples were recorded .Meanwhile ,the ballast particles were constructed with triangle-surface based on the layer scanning method in three dimensions .The irregular ballast particles were randomly filled with poly-dispersed spheres using parallel-bonding method .The breakage of ballast under compression was simulated with discrete element method (DEM ) to determine the effective compressive strength .From the physical experiments and the DEM simulations ,we found that the effective compressive strength decreases with the increase of effective diameter of ballast .The effective compressive strength of ballast satisfies the Weibull probability distribution .The parameters in the Weibull survival probability were determined .The simulated results with DEM were compared well with the experimental data .关键词
离散元方法/铁路道砟/破碎特性/统计分析Key words
discrete element method/railway ballast/breakage characteristics/probability analysis分类
建筑与水利引用本文复制引用
严颖,赵春发,李勇俊,季顺迎..铁路道砟破碎特性的离散元分析[J].计算力学学报,2017,34(5):615-622,8.基金项目
国家自然科学基金(U 1234209 ,11572067 )资助项目 . （U 1234209 ,11572067 ）
