Numerical evaluation of a multiple soil barrier system preventing water infiltration

Y. Takayama, Y. Ikuta, A. Iizuka, K. Kawai, T. Taki, R. Sakao, Y. Ichikawa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    In this paper, a multiple unsaturated soil barrier system consisting of multiple layers of gravel, sand, decomposed granite soil, and bentonite mixture soil is considered as a hardly permeable covering to prevent rainwater from infiltrating into waste deposits. Water infiltration is prevented due to both the low permeability of the bentonite mixture soil layer and a capillary barrier with different water-retention capabilities. A series of numerical simulations was carried out to evaluate the performance of the barrier system using a saturated/unsaturated soil/water coupled FE computation technique. Impermeability of the barrier system is shown as a graphical chart with rainfall duration on the x-axis and rainfall intensity on the y-axis. The simulation results show that the capillary barrier is a key parameter in evaluating the long-term performance of the barrier system. Results also confirm that the barrier system can work well against the maximum intensity of the rainfall recorded in Nigyo-toge.

    Original languageEnglish
    Title of host publicationUnsaturated Soils
    Subtitle of host publicationResearch and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014
    PublisherTaylor and Francis - Balkema
    Pages659-665
    Number of pages7
    ISBN (Print)9781138026896
    Publication statusPublished - 2014
    Event6th International Conference on Unsaturated Soils, UNSAT 2014 - Sydney, NSW, Australia
    Duration: Jul 2 2014Jul 4 2014

    Publication series

    NameUnsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014
    Volume1

    Other

    Other6th International Conference on Unsaturated Soils, UNSAT 2014
    Country/TerritoryAustralia
    CitySydney, NSW
    Period7/2/147/4/14

    ASJC Scopus subject areas

    • Soil Science

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