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Pore pressure measurements in saturated sand in front of an approaching EPB and laboratory investigations.

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Title: Pore pressure measurements in saturated sand in front of an approaching EPB and laboratory investigations.
Authors: Zheng, Dongzhu1,2 (AUTHOR) zhengdongzhu.geo@gmail.com, Bezuijen, Adam2,3 (AUTHOR)
Source: Acta Geotechnica. Jun2024, Vol. 19 Issue 6, p4055-4068. 14p.
Subjects: Waterlogging (Soils), Pressure measurement, Soil permeability, Water tunnels, Water leakage, Earth pressure, Foam
Abstract: This paper presents measurements of total pressures and pore pressures in the mixing chamber, the pore pressures in the soil in front of an earth pressure balance (EPB) at the Botlek Rail tunnel, as well as laboratory tests on foam infiltration behavior from foam–sand mixture to saturated sand. It shows that the plastering effect at the tunnel face is less effective for an EPB shield than for a slurry shield, as the pressure fluctuations are greater in the mixing chamber for an EPB shield, suggesting a higher water leakage at the tunnel face. The difference in the development of excess pore pressure at two different locations of the EPB shield suggests the influence of the soil permeability. Foam infiltration at the tunnel face can result in a low permeable layer that restricts the ground water flow. Results from laboratory tests suggest that foam infiltration will be influenced by foam injection ratio and soil permeability. As the foam infiltration length is only limited, no low permeable layer can be formed during drilling for fine sand conditions. While a larger foam infiltration length can be expected for medium sand condition. Field measurements on the development of pore pressures in the soils at the two different locations show agreement with the conclusions from laboratory tests. [ABSTRACT FROM AUTHOR]
Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Pore pressure measurements in saturated sand in front of an approaching EPB and laboratory investigations.
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  Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Dongzhu%22">Zheng, Dongzhu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> zhengdongzhu.geo@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Bezuijen%2C+Adam%22">Bezuijen, Adam</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Acta+Geotechnica%22">Acta Geotechnica</searchLink>. Jun2024, Vol. 19 Issue 6, p4055-4068. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Waterlogging+%28Soils%29%22">Waterlogging (Soils)</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure+measurement%22">Pressure measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+permeability%22">Soil permeability</searchLink><br /><searchLink fieldCode="DE" term="%22Water+tunnels%22">Water tunnels</searchLink><br /><searchLink fieldCode="DE" term="%22Water+leakage%22">Water leakage</searchLink><br /><searchLink fieldCode="DE" term="%22Earth+pressure%22">Earth pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Foam%22">Foam</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This paper presents measurements of total pressures and pore pressures in the mixing chamber, the pore pressures in the soil in front of an earth pressure balance (EPB) at the Botlek Rail tunnel, as well as laboratory tests on foam infiltration behavior from foam–sand mixture to saturated sand. It shows that the plastering effect at the tunnel face is less effective for an EPB shield than for a slurry shield, as the pressure fluctuations are greater in the mixing chamber for an EPB shield, suggesting a higher water leakage at the tunnel face. The difference in the development of excess pore pressure at two different locations of the EPB shield suggests the influence of the soil permeability. Foam infiltration at the tunnel face can result in a low permeable layer that restricts the ground water flow. Results from laboratory tests suggest that foam infiltration will be influenced by foam injection ratio and soil permeability. As the foam infiltration length is only limited, no low permeable layer can be formed during drilling for fine sand conditions. While a larger foam infiltration length can be expected for medium sand condition. Field measurements on the development of pore pressures in the soils at the two different locations show agreement with the conclusions from laboratory tests. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1007/s11440-023-02139-1
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 4055
    Subjects:
      – SubjectFull: Waterlogging (Soils)
        Type: general
      – SubjectFull: Pressure measurement
        Type: general
      – SubjectFull: Soil permeability
        Type: general
      – SubjectFull: Water tunnels
        Type: general
      – SubjectFull: Water leakage
        Type: general
      – SubjectFull: Earth pressure
        Type: general
      – SubjectFull: Foam
        Type: general
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      – TitleFull: Pore pressure measurements in saturated sand in front of an approaching EPB and laboratory investigations.
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            NameFull: Bezuijen, Adam
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            – D: 01
              M: 06
              Text: Jun2024
              Type: published
              Y: 2024
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