An analytical model on the sealing performance of space for the design of buffer material and backfill material

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

Abstract

The self-sealing function of the clearances between buffer material and overpack and tunnel wall or disposal pit wall and between backfill material and tunnel wall is expected for bentonite which will be used as buffer material and part of the backfill material. In this study, an analytical theory on the clearance filling performance for both materials was constructed. Volumetric swelling ratio of bentonite (Rvs) and maximum clearance ratio that bentonite can fill clearance (Rsmax) were calculated against dry density for different montmorillonite and silica sand contents of bentonites in distilled water and saline water conditions (Horonobe groundwater and synthetic seawater). Both Rvs and Rsmax values decreased with decreasing montmorillonite content and decreased in saline water conditions. The Rvs values in the Horonobe groundwater (ionic strength IS = 0.207 M) were approximately a half of those in distilled water and those in synthetic seawater (IS = 0.64 M) were approximately a half of those in the Horonobe groundwater. In the case that actual sealing performance is judged, not only clearance filling, but also hydraulic conductivity etc. after the clearance was filled must be considered. In the design of buffer material and backfill material, those parameters must be systematically taken into account.

Original languageEnglish
Title of host publicationASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
Pages175-184
Number of pages10
DOIs
Publication statusPublished - Dec 1 2010
Externally publishedYes
EventASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010 - Tsukuba, Japan
Duration: Oct 3 2010Oct 7 2010

Publication series

NameProceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM
Volume2

Other

OtherASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
CountryJapan
CityTsukuba
Period10/3/1010/7/10

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Keywords

  • Backfill material
  • Bentonite
  • Buffer material
  • Clearance filling
  • Geological disposal
  • Swelling

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Waste Management and Disposal

Cite this

Sato, H. (2010). An analytical model on the sealing performance of space for the design of buffer material and backfill material. In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010 (pp. 175-184). (Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM; Vol. 2). https://doi.org/10.1115/ICEM2010-40067