Reference : Multi-scale modelling of permeability evolution in the excavation damaged zone around tu...

	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/2268/90758

Title :	Multi-scale modelling of permeability evolution in the excavation damaged zone around tunnels
Language :	English
Author, co-author :	Levasseur, Séverine [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur >]
	Collin, Frédéric [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur >]
	Charlier, Robert [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur >]
	Kondo, Djimédo [ > > ]
Publication date :	2011
Main document title :	PROCEEDINGS OF THE 2nd INTERNATIONAL SYMPOSIUM ON COMPUTATIONAL GEOMECHANICS (COMGEO I )
Pages :	620-628
On invitation :	No
Audience :	International
Event name :	ComGeo II Symposium
Event date :	du 27 au 29 avril 2011
Event place (city) :	Dubrovnik
Event country :	Croatie
Abstract :	[en] A zone with significant irreversible deformations and significant changes in flow and transport properties is expected to be formed in indurated clay around underground excavations. The stress perturbation around the excavation could lead to a significant increase of the permeability, related to diffuse and/or localized crack propagation in the material. The main objective of the study is to model these processes at large scale with a micromechanical damage approach, based on the Ponte-Castaneda and Willis approximation (PCW) in the presence of initial stress, in order to assess the crack impacts on the performance of radioactive waste geological repositories. Combined with this model, permeability tensor is described as a function of micromechanical damage that is generated during the excavation. Advantages and drawbacks of this approach are described thanks to the results on Opalinus Clay and of the Selfrac long term dilatometer experiment.
Permalink :	http://hdl.handle.net/2268/90758

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