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Determination of the Porosity, Permeability and Diffusivity of Rock in the Excavation-Disturbed Zone Around Full-Scale Deposition Holes Using the He-Gas Method

Published online by Cambridge University Press:  10 February 2011

J. Autio ,
J. Timonen ,
T. Aaltonen ,
M. Laajalahti ,
K. Kuoppamäki  and
J. Maaranen
J. Autio
Affiliation:
Saanio & Riekkola Consulting Engineers, Laulukuja 4, FIN-00420 Helsinki, Finland
J. Timonen
Affiliation:
University of Jyväskylä, Department of Physics, Jyväskylä, Finland
T. Aaltonen
Affiliation:
University of Jyväskylä, Department of Physics, Jyväskylä, Finland
M. Laajalahti
Affiliation:
University of Jyväskylä, Department of Physics, Jyväskylä, Finland
K. Kuoppamäki
Affiliation:
University of Jyväskylä, Department of Physics, Jyväskylä, Finland
J. Maaranen
Affiliation:
University of Jyväskylä, Department of Physics, Jyväskylä, Finland
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Abstract

In a nuclear waste repository, rock in the excavation-disturbed zone adjacent to the walls of deposition holes for waste canisters is a potential pathway for the transport of corrosive agents and radionuclides. Three experimental holes the size of deposition holes in a KBS-3 type repository (depth 7.5 m and diameter 1.5 m) were bored in hard granitic rock in the Research Tunnel at Olkiluoto and the porosities, effective diffusivities and permeabilities of rock in the excavation-disturbed zone were determined in a direction parallel to the disturbed surface using He-gas methods. Permeability and diffusivity in a direction parallel to the rock schistosity was found to be clearly larger than in a direction perpendicular to it.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 759
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

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