A numerical study on the waterproofing effect of Fan Grouting under tunnel excavation

터널 굴착 중 Fan Grouting의 차수 효과에 관한 수치해석적 연구

  • Received : 2019.01.08
  • Accepted : 2019.02.01
  • Published : 2019.03.31


Ground water generated under tunnel excavation has a major impact on tunnel construction and stability. Thus, effective waterproof grouting is needed to reduce the inflow of groundwater. Most tunnel designs are applying the Pre Grouting. However there are no propriety analysis for grouting material and waterproof effect. In this study, numerical analysis was performed in order to investigate the effect of waterproof with decrease of coefficient of permeability of the grouting area based on the case of grouting construction.

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Fig. 1. Pre Grouting

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Fig. 3. Photos in the tunnel and layout

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Fig. 4. Manjet tube and U-GIP injection pipe

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Fig. 5. Principle of U-GIP injection pipe

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Fig. 6. Numerical model

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Fig. 7. Result of discharge and pore pressure

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Fig. 2. Fan Grouting

Table 1. Evaluation of leakage

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Table 2. Ground design parameters

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Table 3. Result of pore pressure and discharge at position of grouting

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