Advertisement

Applicability of Sedimentary Rock in Hydraulic Barrier System Construction

  • S. Iso
  • T. Motoshima
  • H. Komine
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

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.

Keywords

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

References

  1. 1.
    Ordinance of the Prime Minister’s Office and the Ministry of Welfare, Engineering Standards Pertaining to the Final Disposal Site for Municipal Solid Wastes and Final Disposal Site for Industrial Waste, Ordinance of the Ministry of the Environment No. 3Google Scholar
  2. 2.
    Komine H (2004) Simplified evaluation on hydraulic conductivities of sand-bentonite mixture backfill. Appl Clay Sci 26:13–19CrossRefGoogle Scholar
  3. 3.
    Japanese Geotechnical Society Standards (2009) Laboratory Testing Standards of Geomaterials, vol 2Google Scholar
  4. 4.
    NEXCO (2006) Laboratory Testing of NEXCO, pp 20–22Google Scholar
  5. 5.
    Hareyuki Y, Ichirou K, Makoto F (1990) Compaction properties of crushed mudstone product by slakingGoogle Scholar
  6. 6.
    Ogata N, Komine H (1993) The relationship between permeability characteristics and aggregate and soil-bentonite mixtures, annual meeting of Japan Society of Civil Engineering, pp 1080–1081Google Scholar
  7. 7.
    Haruo H (2008) Clay Mineralogy-Basic of Clay Science. Asakura Publishing CorporationGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Civil Engineering Department, Nuclear Facilities DivisionTaisei CorprationTokyoJapan

Personalised recommendations