A Methodolody of Considering the Failure of Supports in Evaluating Tunnel Safety Factors

터널의 안전율 평가 시 지보재 파괴 고려 방안 연구

  • 유광호 (수원대학교 공과대학 토목공학과) ;
  • 홍근영 ((주)삼보기술단 지반부) ;
  • 박연준 (수원대학교 공과대학 토목공학과) ;
  • 이현구 (삼성건설(주) 토목사업본부) ;
  • 김재권 (삼성건설(주) 토목사업본부)
  • Published : 2005.04.01


The safety factor of a tunnel considering the failure of supports is important because the failure of supports might cause the collapse of the tunnel. In the previous studies, shotcrete was modelled as beam elements and the failure of the shotcrete was checked according to the allowable working stress concept. In this study, shotcrete was modelled by both beam elements and continuum (elasto-plastic) elements. Safety factors of tunnels were estimated by two dimensional numerical analysis with varying rock mass class, coefficient of lateral pressure, thickness of shotcrete, rock bolt reinforcement and excavation method. Also the study suggested not only a proper amount of supports but also modelling method.