Etude des ouvrages de stockage souterrain de d chets de haute activit
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Etude des ouvrages de stockage souterrain de déchets de haute activité. ULg – équipe de géomécanique SCK – CEN / ULg 02/09/10. ULg Geomechanics team. R. Charlier, Pr. O, chairman SAC Praclay F. Collin, Chercheur Qualifié FNRS S. Levasseur et B. François, Chargés de Recherche FNRS

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Etude des ouvrages de stockage souterrain de d chets de haute activit

Etude des ouvrages de stockage souterrain de déchets de haute activité

ULg – équipe de géomécanique

SCK – CEN / ULg 02/09/10


Ulg geomechanics team
ULg Geomechanics team haute activité

  • R. Charlier, Pr. O, chairman SAC Praclay

  • F. Collin, Chercheur Qualifié FNRS

  • S. Levasseur et B. François, Chargés de Recherche FNRS

  • A. Dizier (FRIA), P. Gérard, S. Delvoie, B. Cerfontaine, doctorants

  • JP Radu, F. Pascon, ingénieurs de recherche

  • Lab’s team 4 people.


Research themes
Research themes haute activité

  • Geomechanics

  • Rupture

  • Thermo-hydro-mechanical coupling

  • Numerical modelling : LAGAMINE code

  • Experimental investigations


Stockage géologique profond: différents concepts haute activité

  • 2 options

    • Forages profonds creusés à partir de la surface

    • Enfouissement dans des mines


The PRACLAY in-situ experiment comprises three tests: haute activitéthe “Gallery&Crossing Test”, the “Seal Test” and the “Heater Test”


Underground nuclear waste disposals
Underground nuclear waste disposals haute activité

  • Rock behaviour around disposals

  • Mechanical behaviour

  • Fluid transfers

  • Heating / cooling effect

  • Numerical simulation

  • Clayey rocks : URL Mol, Bure, Mont Terri


Fractures observed at bure and hades
Fractures observed at Bure and HADES haute activité

COX

Slickenside

BC





Dz as a preferential transport pathway
DZ as a preferential transport pathway COX and BC

  • DZ : damaged zone, i.e. zone strongly modified by the mechanical loading

  • Mechanical loading : excavation, heating, gas generation

  • Transport pathway : fluid (liquid and gas) flow as radionuclide advective transport


Geomechanics coupled to fluid flow geomechanics know how
Geomechanics coupled to fluid flow : geomechanics know-how COX and BC

  • Fluid pressure direct influence on mechanical state of stress : Terzaghi / Bishop effective stress, net stress + suction

  • But few effect of geomechanics on fluid flow, unless changes in permeability

  • Damage, permeability and stress distribution studies in Excavation Damaged Zone needed


Dz as a preferential transport pathway1
DZ as a preferential transport pathway COX and BC

  • Describe the Damaged Zone

  • Damage as a rather general concept

  • Transport pathway : considered based solely on fluid flow

  • Basic question : what is the permeability evolution related to “damage”


Chip formation experimental results lml and numerical modelling ulg
Chip formation : COX and BCexperimental results (LML) and numerical modelling (ULg)




Mod le num rique exp rimental
MODÈLE NUMÉRIQUE / EXPÉRIMENTAL COX and BC

Comparison between experimental data and modelling (at the end of the second phase):

Experimental data show anisotropy

Radial evolution of the radial displacement


Modélisation de la localisation des déformations – ¼ de cylindre creux

Localisation des déformations

de cisaillement

Déplacements

7 mm

42 mm

Déplacement maximum = 3.2 mm

avec

et


EDZ permeability distribution cylindre creux

Coupling : Mechanic – Permeability

Changes of permeability : 5 order of magnitude

Vertical drilling

Horizontal drilling

(Andra, G. Armand)


Edz permeability distribution
EDZ permeability distribution cylindre creux

Structural and hydrogeological characterisation of the excavation-disturbed zone in the Opalinus Clay (Mont Terri Project, Switzerland)

Paul Bossart, Thomas Trick, Peter M. Meier, Juan-Carlos Mayor

Applied Clay Science 26 (2004) 429– 448

Changes of permeability : 2 order of magnitude


Research structure
Research structure cylindre creux

  • Damage zone observations

  • Damage zone simulations

  • Evidences of permeability evolution in DZ

  • Constitutive equations for permeability evolution

  • Anisotropy considerations

  • Numerical simulations of coupled HM problems with permeability evolution


Conclusions
Conclusions cylindre creux

  • Permeability may be strongly modified in EDZ : in situ evidences.

  • Some models relating permeability to strain or damage exist or are in development.

  • Numerical modelling is complex but possible. Few simulations have been done.


Conclusions open questions
Conclusions : Open questions cylindre creux

  • Lab evaluation of permeability evolution with strain / damage remains difficult. Nevertheless progresses are ongoing.

  • Strain and micro fissure localisation effect on permeability needs to be better understood.

  • Strong need of model validation both on lab and in situ experiments.


Collaborations
Collaborations cylindre creux

  • Euridice

  • SCK CEN

  • ONDRAF

  • ANDRA

  • NAGRA

  • University : Barcelona, Lausanne, Paris, Grenoble, Lille, etc…


European projects
European projects cylindre creux

  • CATSIUS CLAY (benchmarks : clay modelling)

  • TIMODAZ (thermal effects and Excavated Damage Zone)

  • FORGE (gas transfers)


Future cooperation with sck cen
Future cooperation with SCK-CEN cylindre creux

  • FORGE project : numerical simulation of gas flow – Mol in situ test

  • Gas flow in EDZ …

  • Anisotropy and elastoplastic behaviour

  • Mol geological history and fracture prediction

  • Doctoral thesis ?


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