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Research Paper

Investigation for the deformation behavior of the precast arch structure in the open-cut tunnel

개착식 터널 프리캐스트 아치 구조물의 변형 거동 연구

Hak Joon Kim1*
,
Gyu-Phil Lee2
,
Chul Won Lim3
김 학준1*
,
이 규필2
,
임 철원3
1Professor, Dept. of Construction Safety and Disaster Prevention, Daejeon University
2Senior Researcher, Integrated Road Management Research Center, Korea Institute of Civil Engineering and Building Technology
3General Manager, New Business Development Department, Freyssinet Korea
1정회원, 대전대학교 건설안전방재공학과 교수
2정회원, 한국건설기술연구원 도로관리통합센터 수석연구원
3정회원, 후레씨네 코리아 신사업 개발부 부장
* Corresponding Author
31 January 2019. pp. 93-113
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Abstract

The behavior of the 3 hinged precast arch structure was investigated by comparing field measurements with numerical analyses performed for precast lining arch structures, which are widely used for the open-cut tunnel. According to the field measurements, the maximum vertical displacement occurred at the crown with upward displacements during the backfilling up to the crown of the arch and downward displacements at the backfill height above the crown. The final crown displacement was 19 mm upward from the original position. The horizontal displacement at the sidewall, which had a maximum horizontal displacement, occurred inward of the arch when compacting the backfill up to the crown and returned to the original position after completing the backfill construction. According to the analysis of displacement measurements, economical design is expected to be possible for precast arch structures compared to rigid concrete structures due to ground-structure interactions. Duncan model gave good results for the estimation of displacements and deformed shape of the tunnel according to the numerical analyses comparing with field measurements. The earth pressure coefficients calculated from the numerical analyses were 0.4 and 0.7 for the left and the right side of the tunnel respectively, which are agreed well with the eccentric load acting on the tunnel due to topographical condition and actual field measurements.

Keywords
Open-cut tunnel
Precast lining
3 hinged
Precast arch structure
Duncan model

최근 개착식 터널공법으로 널리 사용되고 있는 프리캐스트 라이닝 아치 구조물에 대하여 현장 계측과 수치해석 결과를 비교하여 3힌지 프리캐스트 아치 구조물의 거동을 분석하였다. 현장 계측결과, 천단부에서 가장 큰 연직변위가 측정되었으며 초기에는 상방향으로 변위가 발생하다가 뒤채움 흙이 천단부보다 높아지면서 하방향으로 변위가 발생하였다. 천단부는 최종적으로 원 위치로부터 상방향 19 mm에서 변위가 수렴하였다. 측벽부 최대 수평변위 지점에서의 수평변위는 아치상단까지 뒤채움시 터널 내측으로 발생하여 두 지점간의 수평거리가 줄어들다가, 상부 성토가 진행될수록 수평변위는 감소하여 원래 위치로 이동하였다. 프리캐스트 아치구조물에 대한 변위 분석결과, 지반-구조물의 상호작용을 잘 관찰할 수 있었으며 따라서 기존의 강성구조물과 비교하여 경제적인 설계가 가능할 것으로 기대된다. Duncan 모델을 사용한 유한요소 해석결과를 현장 변위 계측값과 변위 형상 등과 비교하면 유사한 결과를 나타내었다. 수치해석 결과에 의한 측벽부의 수평토압계수는 터널 좌측부는 0.4, 우측부는 0.7에서 수렴하여, 편토압이 발생하는 현장상황 및 현장 변위 계측 결과와도 일치하였다.

키워드
개착식 터널
프리캐스트 라이닝
3힌지
프리캐스트 아치 구조물
Duncan 모델
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 21
  • No :1
  • Pages :93-113
  • Received Date : 2018-10-30
  • Revised Date : 2018-11-15
  • Accepted Date : 2018-11-21
  • DOI :https://doi.org/10.9711/KTAJ.2019.21.1.093
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