Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Stability Estimation of NATM Tunnel due to Excavation using Back Analysis

역해석기법을 통한 NATM 터널의 안정성 평가

  • Lee, Jae-Ho (Dept. of Civil Engineering, Kyungpook National University) ;
  • Kim, Young-Su (Dept. of Civil Engineering, Kyungpook National University) ;
  • Jin, Guang-Ril (Dept. of Civil Engineering, Kyungpook National University) ;
  • Park, Jin-Kyu (Korea Rural Community & Agriculture Corporation) ;
  • Park, Si-Hyun (Dept. of Underground Structure, KISTEC) ;
  • Choi, Chil-Yong (Construction Technical Management Office, Korea Water Resources Corporation)
  • 이재호 (경북대학교 토목공학과) ;
  • 김영수 (경북대학교 토목공학과) ;
  • 김광일 (경북대학교 토목공학과) ;
  • 박진규 (한국농촌공사) ;
  • 박시현 (한국시설안전기술공단 지하시설실) ;
  • 최칠용 (한국수자원공사 기술관리실)
  • Published : 2008.03.28
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Abstract

Successful design, construction and maintenance of NATM tunnel demands prediction, control, stability estimation and monitoring of surface settlement, gradient and ground displacement with high accuracy. Back analysis using measured data and forward analysis have been and are indispensable tools to achieve this goal. Sakurai provided the hazard warning levels for assessing the stability of tunnels using the relation of critical strain and apparent Young's modulus. This paper performed the estimation of tunnel stability on construction. Firstly, the apparent Young's modulus concept and back analysis method is introduced for the assessment of tunnel safety during excavation a brief framework. Secondly, this paper deals with case study using "Apparent Young's modulus" and "Back analysis" for the purpose of estimating the stability of NATM tunnel in Korea. Finally, a general method that can be estimated the tunnel stability discussed by a flow chart.

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