Evaluation of Dynamic Stability of Precast Floating Slab Track with Vehicle-Track Interaction Analysis

차량-궤도 상호작용 해석을 통한 사전 제작형 플로팅 슬래브 궤도의 동적 안정성 검토

  • Jang, Dongdoo (Smart Station Research Team, Korea Railroad Research Institute) ;
  • Kim, Jin-Ho (Smart Station Research Team, Korea Railroad Research Institute) ;
  • Kwon, Se-Gon (Research Institute, Korail)
  • 장동두 (한국철도기술연구원 스마트역사연구팀) ;
  • 김진호 (한국철도기술연구원 스마트역사연구팀) ;
  • 권세곤 (한국철도공사)
  • Received : 2017.02.22
  • Accepted : 2017.03.10
  • Published : 2017.03.31


A precast floating slab track with a 5m slab panel and installed with isolators is proposed to solve the noise and vibration problem at existing elevated railway stations. Thus, the construction can be carried out rapidly without interrupting the train operation. However, dynamic instability problems may be caused by repeated discontinuities in track due to the short slab panel length and excessive rail displacement due to the inherent operation mechanism of a floating system in reducing the vibration. Furthermore, the difference of the supporting stiffness at the transition between the floating track and ballast track may raise problems. In this study, the assessment factors to evaluate the dynamic stability of the precast floating slab track are presented and assessed with the vehicle-track interaction analysis. Through the analysis, all values relevant to the stability at the floating track section are found to be acceptable, and the slab panels at the transition section are designed to satisfy the stability.

기존 선하역사의 소음 및 진동 문제를 해결하기 위해 제안된 사전 제작형 플로팅 슬래브 궤도는 길이 5m 정도의 슬래브 패널을 공장에서 제작하고 방진장치를 설치하여 일체화한 궤도이다. 이를 통해 별도의 열차 운행 중단 없이 급속 시공이 가능하여 신설역사 뿐 아니라 기존 선하 역사에 적용이 가능한 장점이 있다. 그러나 패널 길이가 5m로 짧아 실제 시공 구간 길이에 따라 다수의 패널이 설치되어야 함에 따라 궤도의 불연속 구간이 많이 발생한다. 또한 플로팅 슬래브 궤도의 작동 원리 상 일반 궤도에 비해 차량 운행으로 인한 과도한 변위가 발생할 여지가 있고 기존 궤도와의 접속부에서의 지지강성 차이로 인해 동적 불안정성이 발생할 우려가 있다. 본 연구에서는 사전 제작형 플로팅 슬래브 궤도에 대해 차량-궤도 상호작용 해석을 수행하여 윤중변동율, 차체가속도, 레일응력 및 상압력의 검토를 통해 동적 안정성을 확인하였다. 검토 결과 플로팅 궤도 구간 내에서의 동적 안정성은 확보하는 것으로 나타났지만 기존 궤도와의 접속부에서는 일부 기준을 초과하는 것으로 나타나 이를 해소하기 위한 방진장치 배치 방안을 제시하였다.


Supported by : 국토교통부


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