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A Study of Mechanical Effect of Simulated Fault Movement on Engineered Barrier System

Published online by Cambridge University Press:  21 March 2011

Mayuka Nishimura ,
Takashi Hirai ,
Kenji Tanai  and
Mikazu Yui
Mayuka Nishimura
Affiliation:
Waste Isolation Research Division, Waste Management and Fuel Cycle Research Center Japan Nuclear Cycle Development Institute, Ibaraki, 319-1194, Japan
Takashi Hirai
Affiliation:
Waste Isolation Research Division, Waste Management and Fuel Cycle Research Center Takenaka Civil Engineering & Construction Co., LTD, Tokyo, 136-8570, Japan
Kenji Tanai
Affiliation:
Waste Isolation Research Division, Waste Management and Fuel Cycle Research Center Japan Nuclear Cycle Development Institute, Ibaraki, 319-1194, Japan
Mikazu Yui
Affiliation:
Waste Isolation Research Division, Waste Management and Fuel Cycle Research Center Japan Nuclear Cycle Development Institute, Ibaraki, 319-1194, Japan
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Abstract

The objective of this study is to clarify the mechanical effect on the engineered barrier system (EBS) of a fault movement, presupposed to occur in a high-level radioactive waste repository. The plan of this study is; 1) to understand the mechanical behavior of the buffer material when shearing takes place during experimental tests, and 2) to make progress in numerical analysis techniques in order to estimate the effect of fault movement on the EBS at a disposal site.

Accordingly, the first part of this paper reports tests, which were carried out on a 1:20 model of the EBS. The experimental results indicate that the increased total pressure is due, in part, to the increase of pore water pressure. The second part of this paper reports the results of finite element simulations of the experiments. The calculation results show that the permeability of the near-field rock, which influences the amount of water draining from the buffer material, affects the pressure increase in the buffer material. With appropriately set parameters, the calculation shows agreement with the experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 103.1
Copyright
Copyright © Materials Research Society 2006

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References

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