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Mechanical Behaviour of Host Rock Close to H.L.W. Disposal Cavities in a Deep Granitic Formation

Published online by Cambridge University Press:  28 February 2011

J. M. Hoorelbeke  and
M. Dourthe
J. M. Hoorelbeke
Affiliation:
Commissariat à l'Énergie Atomique, IRDI/DERDCA/DIP/SEIP, Centre d'Etudes Nucléaires VALRHO, BP 171, 30205 Bagnols sur Cèze Cedex, France
M. Dourthe
Affiliation:
Commissariat á l'Energie Atomique, DAM/DArC/DT/STR, C.E.S.T.A., BP 2, Le Barp 33830 Belin-Beliet, France
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Abstract

The construction of a H.L.W. repository in a deep granitic formation creates mechanical disturbances in the rock on the scale of the massif and in the nearfield. Amongst all the disturbances noted in the nearfield, this study is concerned with examining the evolution of stresses linked with the excavation of the rock and the rise in temperature in the proximity of the waste packages. Several linear elasticity calculations were made using on the one hand finite element models and on the other simple analytical models. These calculations concern two different storage concepts -“in room” concept and “in floor” concept- whose differences in mechanical behaviour are analysed. A study of sensitivity with regard to the characteristics of the rock and to the initial geostatic stresses is presented. The comparison of the calculated stresses with three-dimensional failure criteria gives a clear indication of the satisfactory behaviour of granite for final storage. However, the need for experimental study and complementary calculation must be emphasised.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 791
Copyright
Copyright © Materials Research Society 1985

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