Effect of seawater on the applicability of a slurry shield TBM

해수가 슬러리 쉴드 TBM 공법 적용성에 미치는 영향

  • Ryu, Young-Moo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Hae-Mahn (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Do-Hyung (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 유영무 (고려대학교 건축사회환경공학부) ;
  • 김해만 (고려대학교 건축사회환경공학부) ;
  • 김도형 (고려대학교 건축사회환경공학부) ;
  • 이인모 (고려대학교 건축사회환경공학부)
  • Received : 2019.01.03
  • Accepted : 2019.02.12
  • Published : 2019.03.31


Formation of filter cake with little slurry penetration into the tunnel face ground is an essential factor to successfully apply the slurry shield tunnel boring machine (TBM) for tunnelling work. However, when the bentonite slurry is in contact with seawater, it is not easy to guarantee the filter cake formation due to decrease of the swelling volume and viscosity of the slurry. In this study, in order to evaluate the effect of the seawater on the applicability of the slurry shield TBM method, the slurry injection tests were carried out with the variation of seawater percentage contained in the slurry samples as well as the variation of soil types. And then, the effect of these two factors on the slurry clogging phenomena was theoretically and experimentally figure out. As a result, it was found that the value of the slurry clogging criteria (SCC) indicating the applicability of the slurry shield TBM significantly decreases up to 67% as the percentage of seawater increases from 0% up to 20%. In addition, it was found to be necessary to take into account both the characteristics of slurry and soil types together when judging the applicability of the slurry shield TBM method by assessing the slurry penetration characteristics that will occur during tunnelling work.

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Fig. 1. Schematic view of slurry and face soil layers (Ryu et al., 2019)

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Fig. 2. Flow of small particles through a tube (Reddi and Bonala, 1997)

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Fig. 3. One-dimensional flow of slurry (Ryu et al., 2019)

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Fig. 4. Estimation of lumped parameter (θ) using slurry sample SL2 and soil sample S1

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Fig. 5. Schematic diagram of experimental setup (Ryu et al., 2019)

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Fig. 6. Particle size distribution curves of soil samples along with the criteria proposed by Krause (1987)

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Fig. 7. Fluid loss curves with variation of seawater percentage contained in slurry

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Fig. 8. Fluid loss curves with variation of particle size distribution of soil samples

Table 1. Slurry evaluation items and criteria (Kim et al., 2017)

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Table 2. Slurry clogging criteria

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Table 3. Physical properties of soil samples

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Table 4. Swelling volume of Na-bentonite with variation of seawater percentage

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Table 5. Viscosity of slurry with variation of seawater percentage

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Table 6. Results of slurry penetration

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Grant : 고수압 초장대 해저터널 기술자립을 위한 핵심요소 기술개발

Supported by : 국토교통부


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