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Coupled chemical-hydraulic-mechanical modelling of long-term alteration of bentonite

Published online by Cambridge University Press:  09 July 2018

T. Ishii ,
R. Yahagi ,
H. Owada ,
I. Kobayashi ,
M. Takazawa ,
K. Yamaguchi ,
Y. Takayama ,
S. Tsurumi  and
A. Iizuka
T. Ishii*
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7, Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
R. Yahagi
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7, Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
H. Owada
Affiliation:
Radioactive Waste Management Funding and Research Center, 1-15-7, Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
I. Kobayashi
Affiliation:
Kajima Corporation, 2-19-1, Tobitakyu, Chofu-shi, Tokyo, 182-0036, Japan
M. Takazawa
Affiliation:
Mitsubishi Material Corporation, 1-297, Kitabukuro-cho, Omiya-ku, Saitama-shi, Saitama, 330-8508, Japan
K. Yamaguchi
Affiliation:
Mitsubishi Material Corporation, 1-297, Kitabukuro-cho, Omiya-ku, Saitama-shi, Saitama, 330-8508, Japan
Y. Takayama
Affiliation:
Graduate School of Engineering, Kobe University, Kobe-shi, 657-8501, Japan
S. Tsurumi
Affiliation:
Graduate School of Engineering, Kobe University, Kobe-shi, 657-8501, Japan
A. Iizuka
Affiliation:
Research Center for Urban Safety and Security, Kobe University, Kobe-shi, 657-8501, Japan
*
*E-mail: ishii@rwmc.or.jp
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Abstract

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In order to evaluate the long-term behaviour of the engineered barriers in geological disposal sites for transuranic element-bearing (TRU) waste, an evaluation by numerical analysis is required. Although chemical and hydraulic/mechanical analyses have been conducted independently until now, essentially both type of phenomena occur simultaneously and produce synergistic effects. Therefore, we focused attention on the buffer (bentonite) engineered barrier and conducted a study of which involved incorporating hydraulic/mechanical phenomena into the chemical analysis of bentonite alteration. The simulations employed weakly-coupled chemical and hydraulic/mechanical effects to study the behaviour in one dimension.

The results showed that the dissolution of the montmorillonite is suppressed in the buffer section nearest the cement material. Moreover, in order to achieve a fully coupled analysis in future, the present study also identifies issues that need to be resolved.

Keywords

engineered barriersstorage/disposal radioactive wastebentonite bufferalterationbatchgeomechanics
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 2 , May 2013 , pp. 331 - 341
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2013 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

References

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