Deformation behaviour of gap-graded fouled ballast evaluated by a 3D discrete element method

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• 作者：Janaka J. Kumara ; Kimitoshi Hayano ; Yoshiaki Kikuchi
• 刊名：KSCE Journal of Civil Engineering
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：20
• 期：6
• 页码：2345-2354
• 全文大小：1,770 KB
• 刊物类别：Engineering
• 刊物主题：Civil Engineering
  Industrial Pollution Prevention
  Automotive and Aerospace Engineering and Traffic
  Geotechnical Engineering
  
• 出版者：Korean Society of Civil Engineers
• ISSN：1976-3808
• 卷排序：20

文摘

The ballast fouling has been identified as a challenging issue in ballasted railway tracks due to huge maintenance costs. In this research, the deformation characteristics of gap-graded fouled ballast were studied from laboratory experiments and a Discrete Element Method (DEM). The fouled ballasts were prepared with different values of a fouling index, FI_p. After the packing behaviour of fouled ballasts was studied by density tests, the stress-strain behaviour of them was studied from triaxial compression tests under both dense and loose states. It was found that the void ratio decreases with FI_p up to 50%, then it increases with FI_p. The results also indicate that the strain-hardening behaviour of ballast is weakened when fouled by FI_p ≥ 30%. The DEM simulation by clump particles produce a similar stress-strain behaviour as the laboratory specimens than their spherical counterparts. The results also reveal that the dilation behaviour of ballast is deteriorated significantly when fouled by FI_p > 50%. The peak frictional angle indicates that the strength properties of ballast are deteriorated significantly when fouled by FI_p ≥ 30%. Therefore, we recommend that fouled ballast should be treated by a maintenance application when ballast is fouled by FI_p > 30%.Keywordsdiscrete element methodfouled ballastfouling indexpacking behaviourstress-strain behaviourtriaxial compression test