期刊
TRANSPORTATION GEOTECHNICS
卷 23, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.trgeo.2020.100341
关键词
Discrete element method; Ballast; Calibration; Degradation; Particle shape; Morphology; Contact model
资金
- China Scholarship Council
- Natural Science Foundation of China [51578469]
- Chinese Program of Introducing Talents of Discipline to Universities (111 Project) [B16041]
- Chinese Ministry of Education
The discrete element method (DEM) has been confirmed as an effective numerical method for modelling railway ballast, and successfully used to analyse a wide range of ballast-related applications (e.g. geomaterials). However, there still exists some aspects under development. Among them, the model calibration can be the most significant one (morphology, degradation and contact model). Because reliable and accurate results can be obtained only when the parameters are carefully selected. Therefore, diverse DEM applications and developments in railway ballast are critically reviewed. Furthermore, the model calibration methods are discussed. This is able to help future researchers improve the existing calibration methods, further, build more accurate, standardised and validated DEM models for ballast-related studies. Additionally, this paper can assist researchers to choose an appropriate model for specific applications.
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