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Résumé

This report deals with investigations about deep fracturing of granite bodies. The aim of this work was to study the evolution of fracturing in granite from the surface to larger depths, so that guidelines can be identified in order to extrapolate, at depth, the data obtained from surface investigations. These guidelines could eventually be used for feasibility studies about radioactive waste disposal. The results show that, for radioactive waste disposal feasibility studies: - The deep state of fracturing in a granite body can be estimated from results obtained at the surface; - Studying only the large fault network would be insufficient, both for surface investigations and for studies in deep boreholes and/or in underground galleries; - It is necessary to study orientations and frequencies of small fractures, so that structural mapping and statistical/geostatistical methods can be used in order to identify zones of higher and lower fracturing.

Informations supplémentaires

Auteurs: BLES J L, BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE);BLANCHIN R BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE), BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE)
Références bibliographiques: EUR 10378 FR (1986) MF, 81 P., BRF 150, BLOW-UP COPY BFR 405, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online