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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A risk management system applicable to NATM tunnels: methodology development and application

NATM 터널의 리스크 관리 시스템 개발 및 현장적용

  • Chung, Heeyoung (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Kang-Hyun (Research Institute, Korea Expressway Corporation) ;
  • Kim, Byung-Kyu (Department of Future Technology and Convergence Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 정희영 (고려대학교 건축사회환경공학부) ;
  • 이강현 (한국도로공사 도로교통연구원) ;
  • 김병규 (한국건설기술연구원 미래융합연구본부) ;
  • 이인모 (고려대학교 건축사회환경공학부) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2020.01.28
  • Accepted : 2020.02.21
  • Published : 2020.03.31
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Abstract

In this paper, a risk management system applicable to NATM tunneling projects is proposed. After investigating case histories in NATM tunnel collapse, this paper analyzes the potential risk factors and their corresponding risk events during NATM tunnel construction. The risk factors are categorized into three groups: geological, design and construction risk factors. The risk events are also categorized into four types: excessive deformation, excessive deformation with subsidence, collapse inside tunnels, and collapse inside tunnels with subsidence. The paper identifies risk scenarios in consideration of the risk factors and proposes a risk analysis/evaluation method for the NATM tunnel risk scenarios. Based on the evaluation results, the optimal mitigation measure to handle the risk events is suggested. In order to effectively facilitate a series of risk management processes, it is necessary to develop a risk register and a management ledger for risk mitigation measures that are customized to NATM tunnels. Lastly, the risk management for an actual NATM tunnel construction site is performed to verify the validity of the proposed system.

본 논문의 목적은 NATM 터널에 적용 가능한 리스크 관리 시스템을 구축하는 것이다. 이를 위해 먼저 NATM 터널 현장의 붕괴 사례를 조사하고, 이를 바탕으로 NATM 터널시공 중 발생 가능한 리스크 사건과 그 발생원인인 리스크 요인을 분석하였다. 리스크 요인은 지질, 설계, 시공 리스크 요인의 세 가지 카테고리로 구분하여 분석하였고, 리스크 사건은 과대변형, 과대변형 및 지표침하, 터널내부 붕락, 붕락 및 지표침하/함몰의 네 가지 유형으로 분석하였다. 또한, 리스크 요인으로부터 리스크 사건이 발생하는 일련의 리스크 시나리오를 리스크 요인별로 식별하였으며, 해당 NATM 터널 리스크 시나리오에 대한 리스크 분석 및 평가 방안을 제시하였다. 평가결과에 따라 리스크 대응이 필요한 시나리오에 대해 최적의 리스크 저감 대책공법을 선정하는 방안을 제시하였고, 일련의 NATM 터널 리스크 관리 프로세스를 효과적으로 수행할 수 있도록 NATM 터널 리스크 등록부 및 대책공법 관리대장을 개발하였다. 또한, 구축한 리스크 관리 시스템을 실제 도로터널 프로젝트에 적용하여 리스크 식별, 분석 및 평가, 대응 과정을 수행함으로써 그 타당성을 검증하였다.

Keywords

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