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Evaluation on the Applicability of the Conventional Roadbed Stiffness for High Speed Concrete Track

일반철도 노반 강성조건에서의 고속철도용 콘크리트 궤도의 적용성 검토

  • Lee, Jin Wook (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Lee, Seong Hyeok (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • SaGong, Myung (New Transportation Systems Research Center, Korea Railroad Research Institute) ;
  • Lyu, Tae Jin (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
  • Received : 2012.08.27
  • Accepted : 2013.01.08
  • Published : 2013.02.28

Abstract

Based on Korean railway design standards, the thicknesses of the reinforced roadbeds of conventional and high speed railways are different, and so too, for the size distribution of the ballast particles. Accordingly, considerable cost would be required to increase operating speeds of conventional lines, in particular related to changing from a ballasted track system to a ballastless one. In this study, applicability of a roadbed which supports conventional ballasted track, for use as a ballastless track for a high speed rail line was examined. A reinforced roadbed for a conventional railway is 20cm thick, and the type of material used for a conventional reinforced roadbed is M-40 (crushed gravel for road embankments). A dynamics test was conducted to evaluate the occurrence of the permanent settlement of the track substructure. These results suggest that, without changes to the track substructure, an operational speed of 400km/h is feasible with a ballastless track. This result; however, is from laboratory experiments. Further studies, such as numerical analyses or field validation, are required.

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