Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Expansion Joint of Concrete Lining and Duct in a Tunnel

터널 콘크리트 라이닝 및 공동구 신축이음 설치방안에 관한 연구

  • Son, Moorak (Department of Civil Engrg., Daegu Univ.) ;
  • Park, Yangheum (Ulsan-Pohang Construction Office, Korea Expressway Corporation) ;
  • Park, Yunjae (Ulsan-Pohang Construction Office, Korea Expressway Corporation) ;
  • Kim, Jaegyoun (Ulsan-Pohang Construction Office, Korea Expressway Corporation) ;
  • Yoon, Jongcheol (Dept. of Construction. Bureau of Construction and Traffic, Gimcheon City Hall)
  • 손무락 (대구대학교 토목공학과) ;
  • 박양흠 (한국도로공사 울산포항사업단) ;
  • 박윤재 (한국도로공사 울산포항사업단) ;
  • 김재견 (한국도로공사 울산포항사업단) ;
  • 윤종철 (김천시청 건설교통국 건설과)
  • Received : 2015.01.02
  • Accepted : 2015.03.26
  • Published : 2015.03.31
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Abstract

The installation of the expansion joints in a tunnel concrete lining and duct would minimize the cracking at the location of structural shape and stiffness change, differential settlement, big temperature change, and so on. However, it is difficult to determine the required spacing of the expansion joint in a tunnel concrete lining and duct quantitatively because the spacing is influenced by temperature change, structure construction condition, ground-structure interaction, and etc. Nevertheless, a highway specification (Korea Expressway Corporation, 2012) or a road design manual (Ministry of Land, Transport and Maritime Affairs, 2010) specifies that the expansion joint spacing in a tunnel concrete lining should be installed uniformly smaller than 25 m from the tunnel portals to 50 m inside of a tunnel and elsewhre 20-60 m in a tunnel (because there is no specifcation for a duct it is assumed that a duct follows the specfication of lining). This specification results in several construction and economic problems in relation with a tunnel construction. Accordingly, in order to minimize the problems, this study analyzed both domestic and foreign design standards and specifications. In addition, field test, theoretical and numerical analyses were carried out in relation to the expansion joint in a tunnel lining and duct. The purpose of this study is to reestabilish a criterion for installing the expansion joint in a tunnel concrete lining and duct.

터널 내 콘크리트 라이닝 및 공동구에는 일반적으로 구조물의 형상 및 강성이 변화하는 위치, 부등침하의 우려가 있는 위치, 온도변화가 심한 곳 등에 신축이음을 설치하여 균열발생을 최소화시키고 있다. 하지만, 설치되는 신축이음의 소요간격은 터널내의 온도변화, 구조물의 시공 및 환경조건, 구조물과 배면지반과의 인터라킹 등에 의해서 영향을 받아 그 간격을 정량적으로 제시하기에는 한계가 있다. 그럼에도 불구하고 고속도로 전문시방서(Korea Expressway Corporation, 2012)나 도로설계편람(Ministry of Land, Transport and Maritime Affairs, 2010)에 의하면 콘크리트 라이닝의 신축이음은 터널 입출구부 50m 이내에서는 25m 이하 간격으로 터널 내부에서는 20-60m 간격으로 일률적으로 설치하도록 되어 있어(공동구는 별도기준이 없어 라이닝 기준 준용) 터널건설과 관련하여 여러 가지 시공 및 경제적 문제점을 야기하고 있다. 따라서 본 연구에서는 이와 같은 문제점을 해소하기 위하여 신축이음 관련 국내 외 설계기준 및 시방서 기준들을 분석함과 더불어 터널내의 신축이음 관련 현장시험시공과 이론 및 수치해석적 검토 등을 수행하여 터널내의 콘크리트 라이닝 및 공동구의 신축이음 설치방안에 대한 기준을 재정립하였다.

Keywords

References

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