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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
  • 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
  • Geomechanics
  • Rupture
  • Thermo-hydro-mechanical coupling
  • Numerical modelling : LAGAMINE code
  • Experimental investigations
slide4

Stockage géologique profond: différents concepts

  • 2 options
    • Forages profonds creusés à partir de la surface
    • Enfouissement dans des mines
slide5
The PRACLAY in-situ experiment comprises three tests: the “Gallery&Crossing Test”, the “Seal Test” and the “Heater Test”
underground nuclear waste disposals
Underground nuclear waste disposals
  • Rock behaviour around disposals
  • Mechanical behaviour
  • Fluid transfers
  • Heating / cooling effect
  • Numerical simulation
  • Clayey rocks : URL Mol, Bure, Mont Terri
dz as a preferential transport pathway
DZ as a preferential transport pathway
  • 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
  • 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
  • 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”
mod le num rique exp rimental
MODÈLE NUMÉRIQUE / EXPÉRIMENTAL

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

Experimental data show anisotropy

Radial evolution of the radial displacement

slide18

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

slide19

EDZ permeability distribution

Coupling : Mechanic – Permeability

Changes of permeability : 5 order of magnitude

Vertical drilling

Horizontal drilling

(Andra, G. Armand)

edz permeability distribution
EDZ permeability distribution

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
  • 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
  • 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
  • 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
  • Euridice
  • SCK CEN
  • ONDRAF
  • ANDRA
  • NAGRA
  • University : Barcelona, Lausanne, Paris, Grenoble, Lille, etc…
european projects
European projects
  • 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
  • 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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