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Determining the unsaturated hydraulic conductivity of a compacted sand–bentonite mixture under constant-volume and free-swell conditions

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Title: Determining the unsaturated hydraulic conductivity of a compacted sand–bentonite mixture under constant-volume and free-swell conditions
Authors: Cui, Y.J. cui@cermes.enpc.fr, Tang, A.M.1, Loiseau, C.1, Delage, P.1
Source: Physics & Chemistry of the Earth - Parts A/B/C. Jun2008 Supplement 1, Vol. 33, pS462-S471. 0p.
Subjects: Soil permeability, Bentonite, Radioactive waste disposal, Fluid mechanics, Microstructure, Soil infiltration
Abstract: Abstract: Highly compacted sand–bentonite mixtures are often considered as possible engineered barriers in deep high-level radioactive waste disposals. In situ, the saturation of these barriers from their initially unsaturated state is a complex hydro-mechanical coupled process in which temperature effects also play a role. The key parameter of this process is the unsaturated hydraulic conductivity of the barrier. In this paper, isothermal infiltration experiments were conducted to determine the unsaturated hydraulic conductivity according to the instantaneous profile method. To do so, total suction changes were monitored at different locations along the soil specimen by using resistive relative humidity probes. Three constant-volume infiltration tests were conducted showing, unexpectedly, a decrease of the hydraulic conductivity during infiltration. One test performed under free-swell conditions showed the opposite and standard trend. These observations were interpreted in terms of microstructure changes during wetting, both under constant-volume and free-swell conditions. [Copyright &y& Elsevier]
Copyright of Physics & Chemistry of the Earth - Parts A/B/C is the property of Elsevier B.V. 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 35364339
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PubTypeId: academicJournal
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  Data: Determining the unsaturated hydraulic conductivity of a compacted sand–bentonite mixture under constant-volume and free-swell conditions
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  Data: <searchLink fieldCode="AR" term="%22Cui%2C+Y%2EJ%2E%22">Cui, Y.J.</searchLink><i> cui@cermes.enpc.fr</i><br /><searchLink fieldCode="AR" term="%22Tang%2C+A%2EM%2E%22">Tang, A.M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Loiseau%2C+C%2E%22">Loiseau, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Delage%2C+P%2E%22">Delage, P.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Physics+%26+Chemistry+of+the+Earth+-+Parts+A%2FB%2FC%22">Physics & Chemistry of the Earth - Parts A/B/C</searchLink>. Jun2008 Supplement 1, Vol. 33, pS462-S471. 0p.
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  Data: <searchLink fieldCode="DE" term="%22Soil+permeability%22">Soil permeability</searchLink><br /><searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+waste+disposal%22">Radioactive waste disposal</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+mechanics%22">Fluid mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+infiltration%22">Soil infiltration</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: Highly compacted sand–bentonite mixtures are often considered as possible engineered barriers in deep high-level radioactive waste disposals. In situ, the saturation of these barriers from their initially unsaturated state is a complex hydro-mechanical coupled process in which temperature effects also play a role. The key parameter of this process is the unsaturated hydraulic conductivity of the barrier. In this paper, isothermal infiltration experiments were conducted to determine the unsaturated hydraulic conductivity according to the instantaneous profile method. To do so, total suction changes were monitored at different locations along the soil specimen by using resistive relative humidity probes. Three constant-volume infiltration tests were conducted showing, unexpectedly, a decrease of the hydraulic conductivity during infiltration. One test performed under free-swell conditions showed the opposite and standard trend. These observations were interpreted in terms of microstructure changes during wetting, both under constant-volume and free-swell conditions. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physics & Chemistry of the Earth - Parts A/B/C is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.pce.2008.10.017
    Languages:
      – Code: eng
        Text: English
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        PageCount: 0
        StartPage: S462
    Subjects:
      – SubjectFull: Soil permeability
        Type: general
      – SubjectFull: Bentonite
        Type: general
      – SubjectFull: Radioactive waste disposal
        Type: general
      – SubjectFull: Fluid mechanics
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Soil infiltration
        Type: general
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      – TitleFull: Determining the unsaturated hydraulic conductivity of a compacted sand–bentonite mixture under constant-volume and free-swell conditions
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            NameFull: Cui, Y.J.
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            NameFull: Tang, A.M.
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            NameFull: Loiseau, C.
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            NameFull: Delage, P.
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            – D: 02
              M: 06
              Text: Jun2008 Supplement 1
              Type: published
              Y: 2008
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              Value: 33
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            – TitleFull: Physics & Chemistry of the Earth - Parts A/B/C
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