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2013 Vol.29, Issue 10 Preview Page
Dynamic Change of Stresses in Subsoil under Concrete Slab Track Subjected to Increasing Train Speeds

열차 증속에 따른 콘크리트 궤도 노반의 동적 응력 변화

Tae-Hee Lee1
,
Chan-Yong Choi2
,
Ernest Nsabimana3
,
Young-Hoon Jung4
이 태희1
,
최 찬용2
,
,
정 영훈4
1Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.
2Senior Researcher, Korea Railload Research Institute
3Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.
4Associate Prof., Dept. of Civil Eng., Kyung Hee Univ.
1경희대학교 사회기반시스템공학과 박사과정
2한국철도기술연구원 선임연구원
3경희대학교 사회기반시스템공학과 박사과정
4경희대학교 사회기반시스템공학과 부교수
교신저자. Corresponding Author. 
31 October 2013. pp. 57-66
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Abstract

Societal interest on a faster transportation demands an increase of the train speed exceeding current operation speed of 350 km/h. To trace the pattern of variations in displacements and subsoil stresses in the concrete slab track system, finite element simulations were conducted. For a simple track-vehicle modeling, a mass-point system representing the moving train load was developed. Dynamic responses with various train speeds from 100 to 700 km/h were investigated. As train speeds increase the displacement at rail and subsoil increases nonlinearly, whereas significant dynamic amplification at the critical velocity has not been found. At low train speed, the velocity of elastic wave carrying elastic energy is faster than the train speed. At high train speed exceeding 400 km/h, however, the train speed is approximately identical to the elastic wave velocity. Nonlinearity in the stress history in subsoil is amplified with increasing train speeds, which may cause significant plastic strains in path-dependent subsoil materials.

Keywords
Critical velocity
Dynamic analysis
Train speed
Concrete Slab Track
Nonlinearity

보다 빠른 교통 수단에 대한 사회적 관심이 현재 운영 중인 KTX의 운행속도인 350km/h을 넘어서는 고속 열차의 운행을 요구하고 있다. 본 연구에서는 콘크리트 궤도 구조물에서 열차 속도 변화에 따른 노반 변위의 변화 양상을 추적하고 비선형적인 노반 응력 변화를 살펴보기 위해 유한요소해석을 실시하였다. 궤도-차량 상호작용을 간단한 형태로 고려하기 위해 이동 하중의 질점 시스템을 개발하였다. 열차 하중의 이동 속도를 100km/h에서 700km/h까지 변화시켜 결과를 얻었다. 열차 속도 증가에 따라 레일과 노반 변위는 비선형적으로 증가하였으나 뚜렷한 임계 속도 효과는 나타나지 않았다. 낮은 열차 속도 대역에서는 열차 속도보다 노반에서 에너지를 전달하는 탄성파 속도가 빠르다. 하지만 400km/h 이상의 열차 속도 대역에서는 열차 속도와 에너지 전달 속도가 거의 일치하였다. 열차 속도 증가에 따라 노반 응력 이력이 크게 변하며 경로 의존적인 토질 재료에서 상당한 크기의 소성 변형률이 예상된다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :10
  • Pages :57-66
  • Received Date : 2013-08-21
  • Revised Date : 2013-09-24
  • Accepted Date : 2013-10-04
  • DOI :https://doi.org/10.7843/kgs.2013.29.10.57
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