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Abstract

This paper states the method and the first results of a way to assess the influence of varied geological events on the permeability at a great depth of a fractured rock. Two sites have been investigated : the granite of Fougeres and the limestone of the upper Jurassic in the Nivernais. Two types of geological events have been recognized as the most likely to cause drastic changes in the state of stress, and thus in the permeability > a glacial age, and an increase of surface temperature. In both cases, the induced variations of stresses have been found, for three time periods (300, 10,000 and 100,000 years), using maximum hypotheses on the extent of these events, and considering two different behaviours of the ground (coefficient of lateral pressure at rest : 0.5 or 1.0). The changes in permeability have then been computed using a program (PETRI) based on the modelling of the mechanical behaviour of fractures. The validity of the results has then been discussed.

Additional information

Authors: BILLAUX D BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE), BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE)
Bibliographic Reference: EUR 9866 FR (1985) MF, VOLUME 8, 41 P., BFR 150, BLOW-UP COPY BFR 205, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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