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Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock

Hywel Thomas Orcid Logo, Philip J. Vardon, Peter J. Cleall

Canadian Geotechnical Journal, Volume: 51, Issue: 3, Pages: 246 - 259

Swansea University Author: Hywel Thomas Orcid Logo

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DOI (Published version): 10.1139/cgj-2013-0094

Abstract

An investigation of the three-dimensional coupled thermohydromechanical behaviour of a prototype repository in fractured granitic rock is presented. The pre-placement behaviour of the repository is first considered, making use of a full three-dimensional simulation of the problem. An effective conti...

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Published in: Canadian Geotechnical Journal
ISSN: 0008-3674 1208-6010
Published: Canadian Science Publishing 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa52832
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spelling 2020-09-16T11:12:39.9000642 v2 52832 2019-11-22 Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 2019-11-22 CIVL An investigation of the three-dimensional coupled thermohydromechanical behaviour of a prototype repository in fractured granitic rock is presented. The pre-placement behaviour of the repository is first considered, making use of a full three-dimensional simulation of the problem. An effective continuum approach, augmented with discrete features with a high hydraulic conductivity, is employed. The method adopted is found to be able to simulate accurately the highly anisotropic flow regime observed at the pre-placement phase. The major features of the full repository experiment under applied heating conditions were then successfully simulated. The range of buffer hydration rates, the thermal response of the repository, and the associated mechanical response were successfully simulated. Approaches to capture both the transient microstructural behaviour of the compacted bentonite (MX-80 type) and a MX-80 pellet material are incorporated. The repository behaviour was shown to be strongly influenced by complex coupled processes, including interactions between the system components. The adoption of a three-dimensional modelling approach proved to be essential to realistically simulate the behaviour of a repository incorporating anisotropic flow behaviour. Finally, potential impacts of the processes considered on performance of the barrier system and in safety assessment are considered. Journal Article Canadian Geotechnical Journal 51 3 246 259 Canadian Science Publishing 0008-3674 1208-6010 1 3 2014 2014-03-01 10.1139/cgj-2013-0094 http://dx.doi.org/10.1139/cgj-2013-0094 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-09-16T11:12:39.9000642 2019-11-22T11:07:22.1446333 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Hywel Thomas 0000-0002-3951-0409 1 Philip J. Vardon 2 Peter J. Cleall 3 52832__15965__1c02f73561c64433a3d903fb0ed5b468.pdf thomas2019(2).pdf 2019-11-26T10:15:31.3258903 Output 2151822 application/pdf Accepted Manuscript true 2019-11-26T00:00:00.0000000 false
title Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
spellingShingle Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
Hywel Thomas
title_short Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
title_full Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
title_fullStr Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
title_full_unstemmed Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
title_sort Three-dimensional behaviour of a prototype radioactive waste repository in fractured granitic rock
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
author Hywel Thomas
author2 Hywel Thomas
Philip J. Vardon
Peter J. Cleall
format Journal article
container_title Canadian Geotechnical Journal
container_volume 51
container_issue 3
container_start_page 246
publishDate 2014
institution Swansea University
issn 0008-3674
1208-6010
doi_str_mv 10.1139/cgj-2013-0094
publisher Canadian Science Publishing
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
url http://dx.doi.org/10.1139/cgj-2013-0094
document_store_str 1
active_str 0
description An investigation of the three-dimensional coupled thermohydromechanical behaviour of a prototype repository in fractured granitic rock is presented. The pre-placement behaviour of the repository is first considered, making use of a full three-dimensional simulation of the problem. An effective continuum approach, augmented with discrete features with a high hydraulic conductivity, is employed. The method adopted is found to be able to simulate accurately the highly anisotropic flow regime observed at the pre-placement phase. The major features of the full repository experiment under applied heating conditions were then successfully simulated. The range of buffer hydration rates, the thermal response of the repository, and the associated mechanical response were successfully simulated. Approaches to capture both the transient microstructural behaviour of the compacted bentonite (MX-80 type) and a MX-80 pellet material are incorporated. The repository behaviour was shown to be strongly influenced by complex coupled processes, including interactions between the system components. The adoption of a three-dimensional modelling approach proved to be essential to realistically simulate the behaviour of a repository incorporating anisotropic flow behaviour. Finally, potential impacts of the processes considered on performance of the barrier system and in safety assessment are considered.
published_date 2014-03-01T04:05:26Z
_version_ 1763753408977698816
score 11.037056

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