[en] The drilling of galleries induces damage propagation in the surrounding medium and creates the Excavation Damaged Zone (EDZ) in which the material properties are modified. The prediction of the fracture structure and flow properties evolution within this zone are major issues especially in the context of underground nuclear waste storage. Since experimental results indicate that shear strain localisation appears prior to fractures, we model the EDZ with strain localisation in shear band mode using the coupled local second gradient model. The evolution of the intrinsic hydraulic permeability inside the fractures is taken into consideration as well as the influence of gallery ventilation on the rock desaturation. The numerical results provide information about the damaged zone extension, structure and behaviour with good correspondence to in situ measurements and observations.
Disciplines :
Civil engineering
Author, co-author :
Pardoen, Benoît ; Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Levasseur, Séverine ; Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Collin, Frédéric ; Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Language :
English
Title :
Excavation damaged zone modelling including hydraulic permeability evolution in unsaturated argilaceous rock
Publication date :
July 2014
Event name :
6th International Conference on Unsaturated Soils, UNSAT 2014
Event organizer :
University of New South Wales (UNSW), International Society for Porous Media (Interpore)
Event place :
Sydney, Australia
Event date :
from 02 to 04-07-2013
Audience :
International
Main work title :
Unsaturated Soils: Research & Applications
Main work alternative title :
[en] 6th International Conference on Unsaturated Soils
Editor :
Khalili, Nasser
Russell, Adrian R.
Khoshghalb, Arman
Publisher :
CRC Press, Taylor and Francis Group, London, United Kingdom
ISBN/EAN :
978-1-138-00150-3
Pages :
1387-1393
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Armand, G., F. Leveau, C. Nussbaum, R. de La Vaissiere, A. Noiret, D. Jaeggi, P. Landrein, & C. Righini (2013). Geometry and properties of the excavation induced fractures at the Meuse/Haute-Marne URL drifts. Rock Mech. Rock Eng. in press.
Armand, G., Y. Wileveau, & J. Delay (2007). Analyse des perméabilités mesurées autour des ouvrages du LSMHM au niveau -490 m pour déterminer des lois empiriques utilisables dans des calculs hydromécaniques couplés en milieu continu. Technical Report D.NT.ALS.07.0453, Andra.
Bossart, P., P. Meier, A. Moeri, T. Trick, & J. Mayor (2002). Geological and hydraulic characterisation of the excavation disturbed zone in the Opalinus Clay of the Mont Terri Rock Laboratory. Eng. Geol. 66, 19-38.
Chambon, R., D. Caillerie, & N. El Hassan (1998). One dimensional localisation studied with a second grade model. Eur. J. Mech. A-Solid 17, 637-656.
Charlier, R., F. Collin, B. Pardoen, J. Talandier, J. Radu, & P. Gerard (2013). An unsaturated hydro-mechanical modelling of two in-situ experiments in Callovo- Oxfordian argillite. Eng. Geol.
Chavant, C. & R. Fernandez (2005, March). Evaluating the reliability of hydro-mechanical simulation: A benchmark of numerical techniques carried out by Research Group of Mo-Mas. In Andra (Ed.), 2nd International Meeting Clays in Natural and Engineering Barriers for Radioactive Waste Confinement, Tours, France, pp. 14-18.
Collin, F., R. Chambon, & R. Charlier (2006). A finite element method for poro mechanical modelling of geotechnical problems using local second gradient models. Int. J. Numer. Meth. Eng. 65, 1749-1772.
Collin, F., S. Levasseur, & R. Chambon (2009). Numerical post failure methods in multiphysical problems. Eur. J. Environ. Civ. Eng. 13, 983-1004.
Coussy, O. (2004). Poromechanics. New York: John Wiley.
Cruchaudet, M., A. Noiret, J. Talandier, B. Gatmiri, & G. Armand (2010). OHZ en GED: EDZ initiale et évolution. Technical Report D.RP.AMFS.11.0016, Andra.
Desrues, J. (2005). Hydro-mechanical coupling and strain localization in saturated porous media. Rev. Eur. Génie Civ. 9, 619-634.
Germain, P. (1973). The method of virtual power in continuum mechanics. Part 2 Microstructure. SIAM J. Appl. Math. 25, 556-575.
Levasseur, S., F. Collin, R. Charlier, & D. Kondo (2013). A micro-macro approach of permeability evolution in rocks excavation damaged zones. Comput. Geotech. 49, 245-252.
Nuth, M. & L. Laloui (2008). Effective stress concept in unsaturated soils: Clarification and validation of a unified framework. Int. J. Numer. Anal. Met. 32, 771-801.
Pardoen, B., S. Levasseur, & F. Collin. Using local second gradient model and shear strain localisation to model the excavation damaged zone in unsaturated claystone. In preparation.
Tsang, C., F. Bernier, & C. Davies (2005). Geohydromechanical processes in the Excavation Damaged Zone in crystalline rock, rock salt, and indurated and plastic clays-in the context of radioactive waste disposal. Int. J. Rock Mech. Min. 42, 109-125.
van Genuchten, M. (1980). A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J. 44, 892-898.
Wileveau, Y., F. Cornet, J. Desroches, & P. Blumling (2007). Complete in situ stress determination in an argillite sedimentary formation. Phys. Chem. Earth 32, 866-878.
Zervos, A., P. Papanastasiou, & I. Vardoulakis (2001). Modelling of localisation and scale effect in thickwalled cylinders with gradient elastoplasticity. Int. J. Solids Struct. 38, 5081-5095.
