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
CountryAustralia
CitySydney, NSW
Period7/2/147/4/14

ASJC Scopus subject areas

  • Soil Science

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