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| An embedded discrete-finite element coupling method for dynamic analysis of ballast bed |
| Received:April 24, 2020 Revised:June 28, 2020 |
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| DOI：10.7511/jslx20200424002 |
| KeyWord:ballast bed discrete element method finite element method coupled discrete-finite element method dynamic characteristics |
| Author | Institution |
| 邵帅 |
内蒙古大学 交通学院, 呼和浩特 |
| 吕泉江 |
中国直升机设计研究所, 景德镇 |
| 纪丹阳 |
内蒙古大学 交通学院, 呼和浩特 |
| 严颖 |
大连交通大学 土木与安全工程学院, 大连 |
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| Abstract: |
| The coupling mode at the interface between a discrete element and a finite element has a significant influence on the behavior of the whole ballast bed in the discrete-finite element method.In the simulation of ballast bed with a clump model or a bonded model,due to the poor self-locking capacity of spherical element and finite element surface,lateral slip of a ballast layer is easy to occur under a train load,resulting in instability of the numerical model.In addition,in a real railway bed,the bottom ballast is embedded in the embankment.Therefore,an embedded discrete-finite element coupling method is developed in this paper.By setting several spherical particles embedded in the embankment finite element model to transfer the mechanical parameters between the discrete element domain and the finite element domain,the coupling between discrete element and finite element methods is realized.Numerical results show that the embedded discrete element-finite element coupling model can effectively reduce the lateral displacement of the ballast bed,and the numerical results are more stable.It is recommended to use the embedded coupling algorithm to solve the coupling problem between continuous media and discrete media like a ballast bed. |
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