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A Study on the Evaluation of Track Support Stiffness on the Various Track Type in Urban Transit

도시철도 궤도구조별 궤도지지강성 평가를 위한 실험적 연구

  • 이동욱 (서울과학기술대학교 철도전문대학원 철도건설공학과) ;
  • 박용걸 (서울과학기술대학교 철도전문대학원 철도건설공학과) ;
  • 최정열 (베를린공과대학교 철도.궤도공학과)
  • Received : 2010.12.20
  • Accepted : 2011.04.10
  • Published : 2011.06.26

Abstract

Track support stiffness which affected track maintenance and riding comfort had a big effect on the track and train. Also, track support stiffness of the track design which was based on theory differs from track support stiffness of the track generated on the field. Track support stiffness was generated by several factors such as dynamic wheel loads, vertical displacement of track, and stress at rail bottom on the field test. With the results of the field test was compared with theoretical value. This paper analyzed that track support stiffness of ballast depended on condition of ballast, and support stiffness of concrete track also depended on the characteristic of track structures such as, normal elastic fastening system, rail floating system and sleeper floating system. However, on the ballast and concrete track, the designed track support stiffness was underestimated less than the measured track support stiffness. When the track condition was estimated on service line, it would not consider the track condition on the field. Therefore, this study proposed the various track type and the range of track support stiffness based on the experimental test.

궤도지지강성은 차량이 주행함에 있어 궤도와 차량에 매우 큰 영향을 미치며, 이는 궤도 파괴이론에 근거한 궤도유지관리와 승객의 승차감에 영향을 준다. 또한 궤도설계 시 고려되는 궤도지지강성은 이론에 근거한 계산치이며 이는 공용중인 궤도에서의 실제 궤도지지강성과는 상이하다. 따라서 본 연구에서는 현장측정을 통해 동적 윤중과 레일수직변위, 레일저부응력을 측정하여 궤도지지강성을 산출하였고 이를 이론 궤도지지강성과 비교 분석하였다. 현장측정결과 자갈도상궤도에서의 궤도지지강성은 자갈의 상태에 직접적인 영향을 받으며 콘크리트궤도의 경우 궤도구조별(일반적인 침목매입식, 레일플로팅, 침목플로팅) 궤도구조특성에 직접적인 영향을 받는 것으로 나타났다. 그러나 자갈 및 콘크리트궤도 모두 설계 시 적용되는 궤도지지강성이 측정된 궤도지지강성에 비해 과소평가되는 것으로 분석되었다. 이는 공용중인 궤도의 상태평가 시 현장의 궤도상태를 반영하지 못한 예측 및 평가가 될 소지가 있을 것으로 판단된다. 이에 본 연구에서는 궤도구조형식 및 궤도상태별 궤도지지 강성의 범위를 실험적으로 제시하였다.

Keywords

References

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Cited by

  1. Retracted: Influence of Track Support Stiffness of Railway Tracks on Track Impact Factor vol.140, pp.8, 2014, https://doi.org/10.1061/(ASCE)EM.1943-7889.0000744
  2. The dynamic response of rail support vol.51, pp.6, 2013, https://doi.org/10.1080/00423114.2013.778415
  3. Experimental Study on the Evaluation of Behavior for Floating Track System Using a Resilient Rubber Mat vol.17, pp.4, 2014, https://doi.org/10.7782/JKSR.2014.17.4.281