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Infiltration behavior and face stability of carbonate-added slurry shield tunnel

탄산을 첨가한 슬러리 쉴드 터널에서의 침투 거동 및 굴진면 안정성 평가

  • Lee, Ik-Bum (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Choi, Ki-Hoon (Doosan E&C) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 이익범 (고려대학교 건축사회환경공학부) ;
  • 최기훈 (두산건설(주) 인프라BG 기술지원팀) ;
  • 이인모 (고려대학교 건축사회환경공학부)
  • Received : 2013.07.03
  • Accepted : 2013.07.20
  • Published : 2013.07.31

Abstract

Slurry shield tunnelling ensures stability by pressurizing the tunnel face with the slurry contained in the chamber. It resists water and earth pressure in order to prevent the failure in the tunnel face during tunnel excavation. If the ground is relatively coarse, slurry can not clog the tunnel face and excessive slurry infiltration will occur. In this case chemical compounds or additives should be added to the slurry in order to improve the clogging phenomena at the tunnel face. In this study, the effect of the carbon dioxide gas as an additive to the slurry instead of chemical compounds on the capability of enhancing the clogging in the tunnel face is investigated. Bubbles arising from the carbonate-added slurry are trapped in the soil voids enhancing the clogging capability. This effect is studied in this paper by performing laboratory model tests simulating in-situ conditions, and by adopting the fine particle clogging theory. Tunnel face stability analysis was also performed and it was found that the effective size ($D_{10}$) of soils which can guarantee tunnel stability utilizing the carbonate-added slurry increased from 1.0 mm up to 2.6 mm. Moreover, Stability analysis showed that the tunnel face is stable if the ${\lambda}$(deposition coefficient) value is greater than $0.007sec^{-1}$.

Acknowledgement

Grant : TBM 핵심 설계.부품기술 및 TBM터널의 최적 건설기술 개발

Supported by : 국토교통부

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