Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Evaluation of Maintenance Quantity and Life Cycle Costs of Railway Track Considering Evolution of Rail Fatigue Damage and Ballast Settlement According to Track Quality Level

궤도 품질수준에 따른 레일 피로 손상과 자갈 침하 진전을 고려한 철도 궤도 보수량 및 수명주기비용 평가

  • Jun-Hyuck Choi ;
  • Seung-Yup Jang (Department of Transportation System Engineering, Graduate School of Transportation, Korea National University of Transportation) ;
  • Seung-Won You ;
  • Do-Yeop Kim ;
  • Hyung-Jo Kim
  • 최준혁 (국립한국교통대학교) ;
  • 장승엽 (국립한국교통대학교) ;
  • 유승원 (한국철도공사, 국립한국교통대학교) ;
  • 김도엽 (한국철도공사, 국립한국교통대학교) ;
  • 김형조 (한국철도공사, 국립한국교통대학교)
  • Received : 2024.07.16
  • Accepted : 2024.07.29
  • Published : 2024.08.31
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Abstract

This study proposes a track maintenance quantity estimation model that considers evolution of rail fatigue damage and ballast settlement based on actual maintenance data from the Gyeongbu high-speed railway, and revises the existing life cycle cost (LCC) model for railway track. Using this model, maintenance quantities and life cycle costs based on different track quality levels are evaluated and discussed. According to the results, it is confirmed that applying the track maintenance quantity estimation model that accounts for rail fatigue damage and ballast settlement allows us to reasonably estimate maintenance costs close to the actual data. The track quality coefficient significantly influences both rail and ballast maintenance quantities, with ballast maintenance having a greater impact than rail maintenance. Additionally, as train speed increases, both rail and ballast maintenance quantities rise. Moreover, a higher track quality coefficient leads to a steeper increase in maintenance quantities with increasing train speed. Consequently, LCC also exhibits a faster growth rate over time with higher track quality coefficients and faster train speeds, resulting from an increased proportion of maintenance costs.

이 연구에서는 철도 궤도의 수명주기비용(life cycle cost, LCC)를 보다 합리적으로 평가하기 위하여 실제 경부고속철도의 궤도 유지보수 데이터를 이용하여 열차 하중의 반복에 따른 레일의 피로 손상과 자갈 침하 진전을 고려한 궤도 보수량 추정 모델을 제시하여 기존 궤도 LCC 모델을 수정 보완하고 이 모델을 이용하여 궤도 품질수준에 따른 유지보수량과 수명주기비용을 분석하였다. 연구결과에 따르면 레일의 피로 손상 진전과 자갈 침하 진전을 고려한 궤도 보수량 추정모델을 적용한 결과 유지보수비를 실제 유지보수 비용에 가깝게 합리적으로 산정할 수 있음을 확인하였다. 궤도품질 영향계수는 레일 보수량 및 자갈다짐 보수량 그리고 결과적으로 유지보수비에도 상당한 영향을 미치고, 레일 보수량 보다 자갈다짐 보수량에 더 큰 영향을 미치는 것으로 나타났다. 또한 열차속도가 증가하면 레일 보수량과 자갈다짐 보수량이 증가하고, 궤도품질 영향계수가 클수록 열차속도에 따른 보수량의 증가율이 더 커지는 것으로 나타났다. 이에 따라 LCC 또한 궤도품질 영향계수가 클수록 열차속도가 커질수록 시간에 따른 증가속도가 빠르고, 유지보수비가 차지하는 비중이 증가하는 것으로 나타났다.

Keywords

Acknowledgement

이 연구는 2024년 국립한국교통대학교 산학협력단의 지원을 받아 수행하였습니다.

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