Article (Scientific journals)
Drying induced shrinkage of Boom Clay: an experimental investigation
Prime, Noémie; Levasseur, Séverine; Miny, Laurent et al.
2016In Canadian Geotechnical Journal, 53 (3), p. 396-409
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Abstract :
[en] Drying induced shrinkage of geomaterials may have a strong effect on geostructure stability and deformation. Settlement of foundations, fracture opening on slopes, roads, tunnel walls may be due to drying shrinkage. However, there is still a lack of knowledge concerning shrinkage evolution in time and shrinkage propagation within the material. In this study, the shrinkage of a specific clayey rock, Boom Clay, under drying conditions is experimentally investigated. This rock is a deep geological formation which is under study for high-level and long-life radioactive waste storage in Belgium. Two experimental campaigns are here presented. The first one, based on vapour equilibrium drying technique and completed by sample size manual measurement, aims to characterize the material shrinkage in balanced states. The second one, based on convective drying technique completed by shape monitoring using X-ray tomography, aims to analyse how shrinkage develops before reaching a steady state. Both approaches put in evidence the shrinkage anisotropy of this structurally bedded rock, with a ratio around 2 between the direction of maximum strains and the direction of minimum strains. However, the two drying techniques also provide complementary results, as the relation between the amount of shrinkage and the retention curve (for the uniform drying imposed with saline solutions) and the kinetics of shrinkage propagation inside the material (for the non-uniform drying imposed with air convection).
Disciplines :
Civil engineering
Author, co-author :
Prime, Noémie;  Ecole Centrale Lyon
Levasseur, Séverine ;  Ondraf-Niras
Miny, Laurent;  Bureau d'Etude Greisch
Charlier, Robert ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Léonard, Angélique  ;  Université de Liège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Collin, Frédéric  ;  Université de Liège > Département ArGEnCo > Géotechnique
Language :
English
Title :
Drying induced shrinkage of Boom Clay: an experimental investigation
Publication date :
March 2016
Journal title :
Canadian Geotechnical Journal
ISSN :
0008-3674
eISSN :
1208-6010
Publisher :
NRC Research Press, Ottawa, Canada
Volume :
53
Issue :
3
Pages :
396-409
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 September 2015

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