The Allowable Displacement Limit on the Approach Slab for a Railway Bridge with Ballastless Track

콘크리트궤도부설 교량의 접속슬래브 허용변위한도에 관한 연구

  • 최진유 (한국철도기술연구원, 궤도토목연구본부 궤도구조연구팀) ;
  • 양신추 (한국철도기술연구원) ;
  • 유진영 (한국철도도시설공단 기술본부 KR기술연구소) ;
  • 조현철 (고려대학교 건축.사회환경공학과)
  • Published : 2007.05.17


The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab is installed to prevent the phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and the deteriorations of track by excessive impact subjected to the track. In this study, parametric studies were performed to know what is the allowable displacement limit on the approach slab to avoid such a bad effect. The length and amount of unequal settlement of the approach slab was adopted as parameter for numerical analysis. And car body accelerations, variations of wheel force and rail stress and uplift force induced on a fastener clip are investigated. From the result, resonable settlement limits of an approach slab according to slab length was suggested.