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A multiple-code simulation study of the long-term EDZ evolution of geological nuclear waste repositories
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
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2009 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 57, no 6, 1313-1324 p.Article in journal (Refereed) Published
Abstract [en]

This simulation study shows how widely different model approaches can be adapted to model the evolution of the excavation disturbed zone (EDZ) around a heated nuclear waste emplacement drift in fractured rock. The study includes modeling of coupled thermal-hydrological-mechanical (THM) processes, with simplified consideration of chemical coupling in terms of time-dependent strength degradation or subcritical crack growth. The different model approaches applied in this study include boundary element, finite element, finite difference, particle mechanics, and elasto-plastic cellular automata methods. The simulation results indicate that thermally induced differential stresses near the top of the emplacement drift may cause progressive failure and permeability changes during the first 100 years (i.e., after emplacement and drift closure). Moreover, the results indicate that time-dependent mechanical changes may play only a small role during the first 100 years of increasing temperature and thermal stress, whereas such time-dependency is insignificant after peak temperature, because of decreasing thermal stress.

Place, publisher, year, edition, pages
2009. Vol. 57, no 6, 1313-1324 p.
Keyword [en]
Coupled THM, Nuclear waste repository, Excavation disturbed zone, Damage, Permeability, elastoplastic cellular-automaton, decovalex-iii project, near-field, safety, yucca mountain, fractured rock, kamaishi mine, excavation, predictions, models, drift
URN: urn:nbn:se:kth:diva-18371DOI: 10.1007/s00254-008-1536-1ISI: 000265622900008ScopusID: 2-s2.0-67349282712OAI: diva2:336417
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-19Bibliographically approved

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Bäckström, AnnJing, LanruKoyama, Tomofumi
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