Applicability of sedimentary rock in hydraulic barrier system construction

S. Iso*, T. Motoshima, Hideo Komine

*この研究の対応する著者

研究成果

抄録

Controlled disposal sites generally rely on impermeable barrier layers to prevent groundwater contamination. Because bentonite has low hydraulic conductivity and high swelling pressures in the presence of water, soil-bentonite mixtures are commonly used with geomembrane to construct hydraulic barriers. If inexpensive materials could be used instead, the potential cost reduction is dramatic. Sedimentary rock is widely distributed in Japan, and it is common for such rock to be excavated from the disposal site itself. This study evaluated the water-shielding performance of bentonite mixtures made with friable Neocene mudstone and commercially available graded sand. The hydraulic conductivity of the friable Neocene mudstone mixture compared favourably with that of the purchased sand mixture, even at half of the standard bentonite mixing ratio (5%). The results also confirmed our hypothesis that the friability of the mudstone could be used practically to improve mixture performance. This study demonstrated the fundamental properties of an efficient construction method that utilised roller compaction to ensure an effective seal. Construction of hydraulic barrier layers using a method that takes advantage of the friability of in situ excavated sedimentary rock, without adjusting its grain size, has the potential to greatly lower construction costs.

本文言語English
ホスト出版物のタイトルProceedings of the 8th International Congress on Environmental Geotechnics Volume 3 - Towards a Sustainable Geoenvironment
編集者Liangtong Zhan, Yunmin Chen, Abdelmalek Bouazza
出版社Springer Berlin Heidelberg
ページ81-88
ページ数8
ISBN(印刷版)9789811322266
DOI
出版ステータスPublished - 2019 1 1
外部発表はい
イベント8th International Congress on Environmental Geotechnics, ICEG 2018 - Hangzhou, China
継続期間: 2018 10 282018 11 1

出版物シリーズ

名前Environmental Science and Engineering
ISSN(印刷版)1863-5520
ISSN(電子版)1863-5539

Conference

Conference8th International Congress on Environmental Geotechnics, ICEG 2018
国/地域China
CityHangzhou
Period18/10/2818/11/1

ASJC Scopus subject areas

  • 環境工学
  • 情報システム

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