Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A study on failure probability characteristic based on the reliability analysis according to the variation of boundary conditions

신뢰성 기반 쉴드터널의 경계조건 변화에 따른 파괴확률 특성에 관한 연구

  • 이규필 (한국건설기술연구원 지반연구본부) ;
  • 박영빈 (우성디앤씨)
  • Received : 2023.10.06
  • Accepted : 2023.10.30
  • Published : 2023.11.30
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Abstract

In this study, a comparison model considering the stochastic characteristics of the load and member resistance of the shield tunnel segment lining as well as the variability of the boundary condition was selected and reliability analysis was performed, and the adequacy of the limit state design was analyzed by calculating the probability of failure and reviewing the structural safety. For the analysis considering the probability characteristics of these ground constants, the ground spring coefficient was considered as the mean value by calculating the quantitative value by applying the Muirwood formula, and the coefficient of variation was selected based on the existing research data to review the models according to the change of ground boundary conditions. Through the structural analysis of these models and the reliability analysis using MCS technique, the failure probability and reliability index were calculated to examine the changes in the failure probability due to changes in ground boundary conditions.

본 연구에서는 쉴드터널 세그먼트 라이닝의 하중과 부재저항의 확률적 특성뿐만 아니라 경계조건의 변동성을 고려한 비교모델을 선정하고 신뢰성해석을 수행하였으며, 파괴확률 산정 및 구조안전성 검토를 통해 한계상태설계의 적정성에 대해 분석을 수행하였다. 이러한 지반 정수의 확률특성치를 고려한 해석을 위해 지반스프링계수는 Muirwood식을 적용하여 정량적 값을 산정하여 Mean값으로 고려하였고, 변동계수는 기존 연구자료를 토대로 지반 경계조건 변화에 따른 검토대상 모델들을 선정하였다. 이러한 모델들에 대한 구조해석과 MCS기법을 적용한 신뢰성분석을 통해 파괴확률과 신뢰성지수를 산정하여 지반경계조건 변화에 따른 파괴확률의 변화를 검토하였다.

Keywords

Acknowledgement

본 논문은 국토교통과학기술진흥원의 건설기술혁신사업인 "TBM 핵심 설계·부품기술 및 TBM 터널의 최적건설기술(과제번호: 10기술혁신E091) - 2세부과제: 고성능 세그먼트 라이닝의 개발"의 일환으로 작성되었습니다.

References

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