Two and three dimensional numerical analyses of excavation damaged zones around deep geological repositories in sedimentary rocks

H. Abdi, E. Evgin, M. Fall, T.S. Nguyen, G. Su

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: M2-B

ABSTRACT: The excavation and operation of potential radioactive waste repositories and the subsequent natural events can result in alterations of the Thermal (T)-Hydrological (H)-Mechanical (M)-Chemical (C) characteristics of the host rock. The excavation of the repository is possibly the main cause of mechanical disturbance, resulting in an excavation damaged zone (EDZ). It is necessary to know the size of the EDZ and the intensity of damage in the rock mass within the EDZ. This investigation shows (a) the differences between the results of two and three dimensional analyses and (b) the effect of the excavation of a second emplacement room on the extent of the EDZ.

RÉSUMÉ: L'excavation et l'opération des ouvrages de stockage des déchets nucléaires, et les événements naturels qui suivent peuvent modifier les caractéristiques thermiques, hydrauliques, mécaniques et chimiques (THMC) de la roche. L'excavation est probablement la cause principale de perturbation mécanique, créant une zone endommagée. Il est nécessaire de connaître la taille et l'intensité de cette zone endommagée. Cette étude montre (a) les différences entre les résultats d'une analyse bi- et tridimensionnelle et (b) l'effet de l'excavation d'une second galerie sur l'étendue de la zone endommagée. 1 INTRODUCTION

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