Applicability of sedimentary rock in hydraulic barrier system construction

S. Iso, T. Motoshima, Hideo Komine

研究成果: Conference contribution

抜粋

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.

元の言語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
出版者Springer Berlin Heidelberg
ページ81-88
ページ数8
ISBN(印刷物)9789811322266
DOI
出版物ステータスPublished - 2019 1 1
外部発表Yes
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(印刷物)1863-5520
ISSN(電子版)1863-5539

Conference

Conference8th International Congress on Environmental Geotechnics, ICEG 2018
China
Hangzhou
期間18/10/2818/11/1

ASJC Scopus subject areas

  • Environmental Engineering
  • Information Systems

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  • これを引用

    Iso, S., Motoshima, T., & Komine, H. (2019). Applicability of sedimentary rock in hydraulic barrier system construction. : L. Zhan, Y. Chen, & A. Bouazza (版), Proceedings of the 8th International Congress on Environmental Geotechnics Volume 3 - Towards a Sustainable Geoenvironment (pp. 81-88). (Environmental Science and Engineering). Springer Berlin Heidelberg. https://doi.org/10.1007/978-981-13-2227-3_10