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

  • 제26권3호
  • /
  • Pages.92-102
  • /
  • 2022
  • /
  • 2234-6937(pISSN)
  • /
  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
권호 표지
DOI QR코드

DOI QR Code

재료의 비선형성을 고려한 터널의 내진성능평가에 관한 연구

A Study on Seismic Performance Evaluation of Tunnel to Considering Material Nonlinearity

  • 최병일 (국토안전관리원 터널실) ;
  • 하명호 (국토안전관리원 터널실) ;
  • 노은철 (국토안전관리원 터널실) ;
  • 박시현 (국토안전관리원 재난안전관리실) ;
  • 강기천 (경상국립대학교 토목공학과)
  • 투고 : 2022.04.12
  • 심사 : 2022.05.16
  • 발행 : 2022.06.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

대표적인 지중구조물인 터널시설물의 거동 특성을 평가하기 위해 다양한 수치해석 모델을 활용할 수 있다. 일반적으로 수치해석시 가장 많이 사용한 Mohr-Coulomb 모델은 탄성-완전소성 거동 모델로 하중증가-하중감소 단계시 변형 특성이 동일하여, 굴착해석의 경우 변위가 현장 상황과 다르게 나타날 수 있는 문제점이 있다. 그에 비해 HS-small Strain Stiffness 모델은 지반별 적용 범위가 넓으며, 초기탄성계수 및 비선형곡선 파라미터 하중증가-하중감소 단계의 탄성계수 등을 입력 가능하게 하여 흙의 변형 특성이 현장 조건에 맞게 해석 가능하다고 알려져 있다. 하지만 토목 기술자들은 지반의 특성 계수 추정의 어려움으로 인해 재료 비선형 특성을 적용 가능한 모델의 사용에 어려움이 있다. 본 연구에서는 토목 기술자들이 터널 수치해석시 일반적으로 적용하는 Mohr-Coulomb 모델과 지반 비선형성을 고려 가능한 HS Small strain Stiffness 모델을 적용한 내진성능평가 결과 값을 비교하여 합리적인 모델 선택의 필요성을 검토하였다.

Various numerical analysis models can be used to evaluate the behavior characteristics of tunnel facilities which are representative underground structures. In general, the Mohr-Coulomb model, which is most often used for numerical analysis, is an elastic-perfect plastic behavior model. And the deformation characteristics are the same during the load increase-load reduction phase. So there is a problem that the displacement may appear different from the field situation in the case of excavation analysis. In contrast, the HS-small strain stability model has a wide range of applications for each ground. And it is known that soil deformation characteristics can be analyzed according to field conditions by enabling input of initial elastic modulus and nonlinear curve parameter and so on. However, civil engineers are having difficulty using nonlinear models that can apply material nonlinear properties due to difficulties in estimating ground property coefficients. In this study, the necessity of rational model selection was reviewed by comparing the results of seismic performance evaluation using the Mohr-Coulomb model, which civil engineers generally apply for numerical analysis of tunnels, and the HS Small strain Stiffness model, which can consider ground nonlinearity.

키워드

과제정보

본 연구는 '2021년 문곡터널 정밀안전진단 및 성능평가' 용역의 지원으로 작성하였습니다.

참고문헌

  1. Atkinson, J. and Sallfors, G. (1991), Experimental determination of soil properties. In Proc. 10th ECSMFE, 3, 915-956.
  2. Choi, B. I, Kim, C. H., Noh, E. C., Ha, M. H., and Park, S. H. (2021), Evaluation of seismic performance of road tunnels in operation, Journal of the Korea Institute for Structural Maintenance and Inspection, 25(5), 127-134. https://doi.org/10.11112/JKSMI.2021.25.5.127
  3. Hardin, B., and Black, W. (1969). Closure to vibration modulus of normally consolidated clays. J Soils Mechanics and Foundation Division ASCE, 95(6), 1531-1537. https://doi.org/10.1061/JSFEAQ.0001364
  4. KALIS. (2021), A Beltway around Seoul(Ilsan~Toegyewon) Facility Precision Safety Diagnosis in 2020~2021(Nogosan1tunnel).
  5. KISTEC (2019), Detailed Guideline for Safety and Maintenance of Facility implementation.
  6. Korean Geotechnical Society. (2015), Structural Fundamental Design Standard Manual.
  7. Liu, Q., and Lee, J. S. (2017), Case Study on Influential Factors of Nonlinear Response History Analysis : Focused on 1989 Loma Prieta Earthquake, Journal of Korean Geotechnical Society, 26, 45-58.
  8. Ministry of Construction and Transport. (1999), Tunnel Design Standards.
  9. Ministry of the Interior and Safety. (2020), General rules for seismic design of facilities.
  10. Ministry of Land, Infrastructure and Transport. (2018), KDS 27 17 00.
  11. Ministry of Land, Infrastructure and Transport. (2018), KDS 27 10 20.
  12. Ministry of Oceans and Fisheries. (2020), Development of performance-based seismic design technologies ofr advancement in design codes for port structures.
  13. Ministry of Public Administration and Security. (2017), Seismic Design Standards.
  14. Park, D. H, Shin, J. H., and Yun, S. U. (2010), Seismic Analysis of Tunnel in Transverse Direction Part 2: Evaluation of Seismic Tunnel Response via Dynamic analysis, Journal of Korean Geotechnical Society, 26(6), 71-85.
  15. Rafal OBRZUD. (2011), The Hardening Soil Model with small strain stiffness.
  16. Z-Soil. (2020), THE HARDENING SOIL MODEL - A PRACTICAL GUIDEBOOK.