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  • Thermal-hydraulic-mechanical and geochemical behaviour of the clay barrier in radioactive waste repositories (model development and validation)


The goal of the study is to analyse and model the behaviour of a clay-based engineered barrier under real repository conditions. A comprehensive experimental programme has been executed including suction and temperature controlled and chemical alteration experiments. A constitutive model for the thermo-hydro-mechanical (THM) behaviour of unsaturated swelling clay has been built. Two types of fully coupled codes have been developed (ie THM codes and coupled geochemical-transport codes and equilibrium codes were built. The extensive database built up from the laboratory experiments has been further used to calibrate and validate the codes. Finally the codes have been applied to simulate laboratory and in situ experiments. It has been shown that the Alonso and Gens constitutive model allows to explain and simulate the observed THM phenomena. The Bacchus 2 in situ hydration experiment performed in the HADES underground research facility has been successfully simulated using parameters derived from independent laboratory experiments. It has been shown that it is possible to apply a coupled two-dimensional geochemical transport code on field scale size of problems with a moderately complex chemistry.

Additional information

Authors: VOLCKAERT G ET AL, SCK/CEN, Mol (BE);ALONSO E ET AL, Universidad Politecnica de Catalunya, Departemento Ingenieria del Terreno, Barcelona (ES);VILLAR M ET AL, CIEMAT, Técnicas Geológicas, Madrid (ES);THOMAS H, University of Wales College of Cardiff, Cardiff School of Engineering (GB);IMBERT C ET AL, CEA/CEN Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 16744 EN (1996) 772pp., FS, ECU 76.00
Availability: Available from the (2)
ISBN: ISBN 92-827-5743-9
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