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| Discrete element analysis of breakage characteristics of railway ballast |
| Received:July 25, 2016 Revised:September 17, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201705013 |
| KeyWord:discrete element method railway ballast breakage characteristics probability analysis |
| Author | Institution |
| 严颖 |
大连交通大学 土木与安全工程学院, 大连 |
| 赵春发 |
西南交通大学 牵引动力国家重点实验室, 成都 |
| 李勇俊 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 季顺迎 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
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| 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. |