Reliability analysis for design of shield tunnel segment lining under earthquake load

Young-Bin Park; Do Kim; Yosep Byun; Gyu-Phil Lee

doi:10.9711/KTAJ.2020.22.3.249

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2020 Vol.22, Issue 3 Preview Page Next Page

Research Paper

Reliability analysis for design of shield tunnel segment lining under earthquake load 쉴드 터널 세그먼트 라이닝의 내진설계를 위한 신뢰성해석

31 May 2020. pp. 249-259

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Abstract

Design criteria for limit state design of underground structures have already been published overseas, and research has been conducted to revise the design method in Korea. In order to estimate the probability of failure under seismic load, the probability variable should be considered in the reliability analysis. In this study, the failure probability of the existing shield tunnel segment lining design was calculated by applying the coefficient of variation (COV) for the earth pressure and the seismic load effect in consideration of the statistical characteristics of the domestic ground properties. Based on the results of calculating the reliability index (β) from the calculated probability of failure and analyzing the reliability index according to the change in the load factor and the results of domestic and foreign research, the target reliability index (β_T) during earthquakes of shield tunnel segment lining is analyzed to be “2.3”, it was proposed as the target reliability index for the design of the limit state under seismic load.

Keywords

Shield tunnel

Segment lining

Seismic condition

Failure probability

Target reliability index

지중 구조물의 한계상태설계를 위한 설계 기준이 해외에서는 이미 발표된 바 있고 국내에서도 설계법 개정을 위한 연구가 수행되고 있다. 지진 시 파괴확률을 추정하기 위해서는 신뢰성 분석에서 확률변수를 고려해야 한다. 본 연구에서는 국내 지반 확률 특성치를 고려한 토압에 대한 변동계수와 지진하중 효과에 대한 변동계수를 적용하여 기존 쉴드 터널 설계 단면에 대한 지진 시 파괴확률을 계산하였다. 산정된 파괴확률로부터 신뢰도지수(β)를 산정하고 하중 계수의 변화에 따른 신뢰도지수를 분석한 결과와 국내외 연구결과를 토대로 쉴드 터널 세그먼트 라이닝의 지진 시 목표 신뢰도 지수(β_T)는 2.3이 합리적인 것으로 분석되어, 지진 시 한계상태설계를 위한 목표 신뢰도 지수로 제안하였다.

키워드

쉴드 터널

세그먼트 라이닝

지진하중

파괴확률

목표 신뢰도지수

References

AASHTO (2017), AASHTO LRFD - Road tunnel design and construction guide specifications, AASHTO, Washington D.C., USA.

British Standards Institution (2015), PAS 8810 - Design of concrete segmental tunnel linings - Code of practice, PSI, London, U.K.

Byun, Y.S., Kim, D., Lee, S.W. (2019), "Determination of the coefficient of variation of parameters for the reliability design of shield tunnel segment lining", Journal of Korean Tunnelling and Underground Space Association, Vol. 21, No. 6, pp. 875-885.

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10.9711/KTAJ.2016.18.3.305

Lee, S.W., Byun, Y.S., Lee, G.P., Park, Y. (2018), "Probabilistic characteristics of design parameters for limit state design of underground structure", Proceedings of the KTA 2018 Annual Spring Conference, Seoul, pp. 105-106.

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10.1201/b12913

Penzien, J., Wu, C.L. (1998), "Stresses in linings of bored tunnels", Earthquake Engineering and Structural Dynamics, Vol. 27, No. 3, pp. 283-300.

10.1002/(SICI)1096-9845(199803)27:3<283::AID-EQE732>3.0.CO;2-T

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 : 22
No :3
Pages :249-259
Received Date : 2020-02-18
Revised Date : 2020-03-27
Accepted Date : 2020-04-02
DOI :https://doi.org/10.9711/KTAJ.2020.22.3.249

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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