Study on the optimal construction of a concrete lining in a weathered rock

Hyeongkeon Kim; Chul Lee; Sun-Woo Lee; Jun-Woo Park

doi:10.9711/KTAJ.2015.17.1.033

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2015 Vol.17, Issue 1 Preview Page Next Page

Study on the optimal construction of a concrete lining in a weathered rock 풍화암지반에 시공되는 콘크리트라이닝의 적정시공에 관한 연구

31 January 2015. pp. 33-47

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Abstract

Concrete lining in tunnel construction is used as secondary support for downward loads when primary support decays. The use of concrete lining varies greatly depending on the intentions of engineer and/or client. An engineer uses much smaller deformation modulus which determines the concrete lining thickness than of a pattern 3, when supporting patterns 4 and 5 are used in a weathered rock and soil. Considering these conditions, this study intends to suggest optimal construction procedures through a back analysis using a computer program(MIDAS-civil). Cases of Seoul Subway System line00 zone00 were selected to be examined for this study. The results show that it is possible to reduce the thickness of concrete lining. When results from this study were applied to Seoul Metropolitan subway construction projects, it is expected to bring economic benefits.

Keywords

Tunnel

Concrete lining

Back analysis

Weathered rock

Supporting pattern

터널에 시공되는 콘크리트라이닝은 1차지보재의 열화를 가정하여 상부로부터 오는 하중을 부담할 수 있도록 설계하는 2차지보재로서, 설계자나 발주기관(client)의 의도에 따라 많은 차이를 나타내고 있다. 특히 풍화암이나 풍화토에 적용하는 지보패턴 4, 5패턴의 콘크리트라이닝 두께를 결정하는 변형계수값을 3패턴에 비해 크게 작은 값을 사용해 보수적으로 설계하고 있는 것으로 나타났다. 본 연구에서는 이런 현재의 여건을 감안 컴퓨터 프로그램(MIDAS-civil)을 사용 역해석을 실시하여 적정한 시공방안을 제시하고자하며, 본 연구를 위해 검토한 기존 프로젝트는 서울지하철 ○○호선 ○○공구의 시공사례를 활용하였다. 검토결과 콘크리트라이닝 두께는 축소할 수 있는 것으로 나타났으며 이를 향후 서울시 도시철도 건설사업에 적용할 경우 경제적인 효과도 클 것으로 기대하고 있다.

키워드

터널

콘크리트라이닝

역해석

풍화암지반

지보패턴

References

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12.Park, K.H. (2013), “A study on the estimation method of ground load applied to concrete lining using back analysis.” Hanyang Univ.

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 : 17
No :1
Pages :33-47
Received Date : 2015-01-05
Revised Date : 2015-01-19
Accepted Date : 2015-01-23
DOI :https://doi.org/10.9711/KTAJ.2015.17.1.033

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

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