Applicability of sedimentary rock in hydraulic barrier system construction

S. Iso, T. Motoshima, Hideo Komine

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

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of the 8th International Congress on Environmental Geotechnics Volume 3 - Towards a Sustainable Geoenvironment
EditorsLiangtong Zhan, Yunmin Chen, Abdelmalek Bouazza
PublisherSpringer Berlin Heidelberg
Pages81-88
Number of pages8
ISBN (Print)9789811322266
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes
Event8th International Congress on Environmental Geotechnics, ICEG 2018 - Hangzhou, China
Duration: 2018 Oct 282018 Nov 1

Publication series

NameEnvironmental Science and Engineering
ISSN (Print)1863-5520
ISSN (Electronic)1863-5539

Conference

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

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Keywords

  • Characteristic of compaction
  • Grain crushing
  • Hydraulic conductivity
  • Sedimentary rock
  • Soil-bentonite mixture
  • Waste disposal site

ASJC Scopus subject areas

  • Environmental Engineering
  • Information Systems

Cite this

Iso, S., Motoshima, T., & Komine, H. (2019). Applicability of sedimentary rock in hydraulic barrier system construction. In L. Zhan, Y. Chen, & A. Bouazza (Eds.), 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