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A Coordinated Benchmark Exercise in the Rheology of Clays

Objective

INTERCLAY II is a coordinated benchmark exercise dealing with the numerical prediction of the rheology of clays. Its broad objectives are to improve confidence in long term predictions of geomechanical behaviour of clay in situations relevant to the underground disposal of radioactive waste.
INTERCLAY II is a coordinated benchmark exercise dealing with the numerical prediction of the rheology of clays. Its broad objectives are to improve confidence in long term predictions of geomechanical behaviour of clay in situations relevant to the underground disposal of radioactive waste.

Following a review of the basic ability of popularly used models and the computer codes which contain them, the following have been formulated:
an axisymmetric 1-dimensional approximation of a cylindrical (ie tunnel) excavation in clay under isothermal and isotropic conditions, with and without a centrally located heat source;
a 2-dimensional, axisymmetric approximation of the progressive excavation of a cylindrical tunnel in clay, again under isotropic, isothermal conditions. Such approximations are relevant to deep repositories;
a plane strain representation of a shallow lined trench repository founded on clay.
In all cases interest centres on the ability of various conceptual models (and the codes in which they are implemented) to predict steady state behaviour.
Work programme:

There are to be 3 principal stages.

In Stage 1 the basic ability of popularly used models and the computer codes which contain them will be briefly reviewed. The review comprises a comparison of the theoretical capabilities of the codes and their performance on 4 simple, somewhat hypothetical problems.

In Stage 2 laboratory tests on reconstituted clays provide the basis for a computational benchmark problem. Participants are asked to replicate the measured laboratory behaviour as far as possible, in their calculations.

In Stage 3 "in-situ" behaviour will be modelled. Sources of well validated in-situ behaviour are relatively scarce and a specially designed heater test is currently in progress at SCK's Mol research facility. Various other "heater" tests at the Mol facility are stand-by candidates. If possible precise details of the actual in-situ behaviour will be withheld from participants so that their predictions are "blind".

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Atkins Wootton Jeffreys Consultants Ltd
Address
Woodcote Grove Ashley Road
KT18 5BW Epsom
United Kingdom

Participants (10)

Association pour la Recherche et le Développement des Méthodes et Processus Industriels - ARMINES
France
Address
Rue Saint-honoré 35
77305 Fontainebleau
BELGIAN NUCLEAR RESEARCH CENTRE
Belgium
Address
200,Herrmann Debrouxlaan 40-42
1160 Bruxelles
Bureau de Recherches Géologiques et Minières
France
Address
Avenue De Concyr
45060 Orléans - La Source
Commissariat à l'Energie Atomique (CEA)
France
Address

91191 Gif-sur-yvette
GROUPEMENT D'INTÉRÊT POUR L'ETUDE DES STRUCTURES SOUTERRAINES DE STOCKAGE
France
Address
Route De Saclay, Ecole Polytechnique
91128 Palaiseau
Geodesign SA
Luxembourg
Address
7,Rue Pierre D'aspelt
1142 Luxembourg
Geotechnical Consulting Group Ltd
United Kingdom
Address
1A Queensbury Place
SW7 2DL London
Ismes SpA
Italy
Address
Via Levata
24068 Seriate Bergamo
UNIVERSIDAD POLITECNICA DE MADRID
Spain
Address
21,Ríos Rosas 21
28003 Madrid
Université Catholique de Louvain
Belgium
Address
1,Place Du Levant 1
1348 Louvain-la-neuve