The influence of high air entry filter on the testing of unsaturated soils using the axis translation technique

    Research output: Contribution to journalArticle

    Abstract

    Suction is an important stress variable that is required for reliable predictions of the likely performance of unsaturated soils. The axis translation technique is the best established method of measuring or controlling suction; however, the success of this application is heavily dependent on the rating of the high air entry filter (HAF) and how it is incorporated into the testing system. This paper reports some basic experiments in which samples of unsaturated kaolin were brought to saturation in stages using 5 bar and 15 bar HAFs. The results have shown that the water equilibrium in unsaturated soils is greatly affected by the rating of filters. The findings also suggest that the flow through unsaturated soils is not necessarily governed by the one-dimensional consolidation theory that was developed for saturated soils, and this may be attributed to the bimodal pore size distribution of unsaturated soils.
    Original languageEnglish
    Pages (from-to)90-98
    Number of pages9
    JournalEnvironmental Geotechnics
    Volume3
    Issue number2
    Early online date11 Sep 2015
    DOIs
    Publication statusPublished - Apr 2016

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