Skip to Main Content
Book Chapter

A pragmatic approach to abstract the excavation damaged zone around tunnels of a geological radioactive waste repository: application to the HG-A experiment in Mont Terri

By
Andrés Alcolea
Andrés Alcolea
TK Consult AG, Hallenstrasse 10, 8008 Zürich, Switzerland
Search for other works by this author on:
Uli Kuhlmann
Uli Kuhlmann
TK Consult AG, Hallenstrasse 10, 8008 Zürich, Switzerland
Search for other works by this author on:
Paul Marschall
Paul Marschall
National Cooperative for the Disposal of Radioactive Waste (NAGRA), Hardstrasse 73, 5430 Wettingen, Switzerland
Search for other works by this author on:
Andrea Lisjak
Andrea Lisjak
Geomechanica Inc., 90 Adelaide Street West, Toronto, Ontario M5H 3V9, Canada
Search for other works by this author on:
Giovanni Grasselli
Giovanni Grasselli
Geomechanica Inc., 90 Adelaide Street West, Toronto, Ontario M5H 3V9, Canada
Search for other works by this author on:
Omid Mahabadi
Omid Mahabadi
Geomechanica Inc., 90 Adelaide Street West, Toronto, Ontario M5H 3V9, Canada
Search for other works by this author on:
Rémi de La Vaissière
Rémi de La Vaissière
French National Agency for Radioactive Waste Management (ANDRA), RD 960, 55290 Bure, France
Search for other works by this author on:
Helen Leung
Helen Leung
Nuclear Waste Management Organization, 22 St Clair Avenue East, Toronto, Ontario M4T 2S3, Canada
Search for other works by this author on:
Hua Shao
Hua Shao
Federal Institute for Geosciences and Natural Resources, Stilleweg 2, 30655 Hannover, Germany
Search for other works by this author on:
Published:
January 01, 2017

Abstract

The excavation damaged zone (EDZ) around the backfilled tunnels of a geological repository represents a possible release path for radionuclides, corrosion and degradation gases that needs to be adequately addressed by safety assessment (SA) modelling tools. The hydromechanical phenomena associated with the creation and temporal evolution of the EDZ are of high complexity, precluding detailed representations of the EDZ in conventional SA. Thus, simplified EDZ models mimicking the safety-relevant features of the EDZ are required. In this context, a heuristic modelling approach has been developed to represent the creation and evolution of the EDZ in an abstracted and simplified manner. The key features addressed are the stochastic character of the excavation-induced fracture network and the self-sealing processes associated with the re-saturation after backfilling of the tunnels. The approach has been applied to a range of generic repository settings to investigate the impact of repository depth and in situ conditions on the hydraulic significance of the EDZ after repository closure. The model has been benchmarked with a dataset from a self-sealing experiment at the Mont Terri underground rock laboratory (URL), demonstrating the ability of the approach to mimic the evolution of the hydraulic significance of the EDZ during the re-saturation phase.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
Search for other works by this author on:
J. Bruno
J. Bruno
Amphos 21, Spain
Search for other works by this author on:
M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
Search for other works by this author on:
E. Verhoef
E. Verhoef
COVRA, The Netherlands
Search for other works by this author on:
Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now