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| Discrete element analysis of elastic modulus of railway ballasts in wind with different sand contents |
| Received:July 03, 2011 Revised:October 04, 2011 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20123025 |
| KeyWord:Ballasts sand content elastic modulus discrete element method |
| Author | Institution |
| 严颖 |
大连交通大学 土木与安全工程学院, 大连 |
| 狄少丞 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 苏勇 |
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: |
| Investigation on elastic modulus of railway ballasts in wind with different sand contents can be benefited to understand the dynamic characteristics of railway track in wind-blown sand areas.In this study,discrete element models are developed,and elastic modulus is calculated of ballasts in wind with different sand contents γ.The results show that elastic modulus remains a constant with low sand contents (γ <30%),and decreases linearly with increasing sand contents with high sand contents (γ>30%).The simulation results agree with the experimental results.The internal mechanism of the relationship between elastic modulus and different sand contents is analyzed in terms of the strength and the spacial distribution of the force chains,and the coordination number of ballast-sand mixtures.The present study can be helpful for the understanding of the dynamic properties of ballasted railway tracks in wind-blown sand areas,and for the structure design and sand disaster treatments of ballasted beds. |
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