Influence of testing on permeability of compacted fine soils

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    The British standard constant-head triaxial test for measuring the permeability of fine-grained soils takes a relatively long time. A quicker test could provide savings to the construction industry, particularly for checking the quality of landfill clay liners. An accelerated permeability test has been developed, but the method often underestimates the permeability values compared owing to structural changes in the soil sample. This paper reports on an investigation
    into the accelerated test to discover if the changes can be limited by using a revised procedure. The accelerated test is assessed and compared with the standard test and a ramp-accelerated permeability test. Four different finegrained materials are compacted at various water contents to produce analogous samples for testing using the three different methods. Fabric analysis is carried out on specimens derived from post-test samples using mercury intrusion porosimetry and scanning electron microscopy to assess the effects of testing on soil structure. The results show that accelerated testing in general underestimates permeability compared with values derived from the standard test, owing to changes in soil structure caused by testing. The ramp-accelerated test is shown to provide an improvement in terms of these structural changes.
    LanguageEnglish
    Article number1400147
    Pages442-438
    Number of pages17
    JournalProceedings of the ICE - Geotechnical Engineering
    Volume168
    Issue numberGE5
    Publication statusPublished - 01 Oct 2015

    Fingerprint

    permeability
    Soils
    Testing
    soil
    Construction industry
    Land fill
    Water content
    soil structure
    structural change
    Clay
    Scanning electron microscopy
    landfill liner
    test
    clay liner
    construction industry
    triaxial test
    savings
    scanning electron microscopy
    water content

    Keywords

    • Soil
    • Permeability testing
    • accelerated permeability test

    Cite this

    @article{99a7653686504f34a959055b187fef58,
    title = "Influence of testing on permeability of compacted fine soils",
    abstract = "The British standard constant-head triaxial test for measuring the permeability of fine-grained soils takes a relatively long time. A quicker test could provide savings to the construction industry, particularly for checking the quality of landfill clay liners. An accelerated permeability test has been developed, but the method often underestimates the permeability values compared owing to structural changes in the soil sample. This paper reports on an investigationinto the accelerated test to discover if the changes can be limited by using a revised procedure. The accelerated test is assessed and compared with the standard test and a ramp-accelerated permeability test. Four different finegrained materials are compacted at various water contents to produce analogous samples for testing using the three different methods. Fabric analysis is carried out on specimens derived from post-test samples using mercury intrusion porosimetry and scanning electron microscopy to assess the effects of testing on soil structure. The results show that accelerated testing in general underestimates permeability compared with values derived from the standard test, owing to changes in soil structure caused by testing. The ramp-accelerated test is shown to provide an improvement in terms of these structural changes.",
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    Influence of testing on permeability of compacted fine soils. / Rankin, George; Sivakumar, Vinayagamoothy; Anderson, Chris; Solan, Brian; MacKinnon, Pauline.

    In: Proceedings of the ICE - Geotechnical Engineering, Vol. 168, No. GE5, 1400147, 01.10.2015, p. 442-438.

    Research output: Contribution to journalArticle

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    AU - Rankin, George

    AU - Sivakumar, Vinayagamoothy

    AU - Anderson, Chris

    AU - Solan, Brian

    AU - MacKinnon, Pauline

    PY - 2015/10/1

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    AB - The British standard constant-head triaxial test for measuring the permeability of fine-grained soils takes a relatively long time. A quicker test could provide savings to the construction industry, particularly for checking the quality of landfill clay liners. An accelerated permeability test has been developed, but the method often underestimates the permeability values compared owing to structural changes in the soil sample. This paper reports on an investigationinto the accelerated test to discover if the changes can be limited by using a revised procedure. The accelerated test is assessed and compared with the standard test and a ramp-accelerated permeability test. Four different finegrained materials are compacted at various water contents to produce analogous samples for testing using the three different methods. Fabric analysis is carried out on specimens derived from post-test samples using mercury intrusion porosimetry and scanning electron microscopy to assess the effects of testing on soil structure. The results show that accelerated testing in general underestimates permeability compared with values derived from the standard test, owing to changes in soil structure caused by testing. The ramp-accelerated test is shown to provide an improvement in terms of these structural changes.

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