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Abstract

This report appraises, from the results of a bibliographical study, the possibility of beginning of a domal rise from the salt layer in which or above which would have been placed a repository. The physical mechanisms of salt creep are first screened, together with the factors determining their intensity and relative importance. These factors are primarily the temperature and the state of stress. Semi-empirical laws are given for some mechanisms. Present knowledge about the state of the salt in the ground are then examined : we are not able to satisfactorily calculate "in situ" stresses, or to explain the existence of an important shear stress, that has been pointed out by most of the stress measurements. The retrospective study of the genesis of existing domes brings on insight into their correlation with sedimentary and tectonic phases. Model studies help us to interpret the distances between domes, and to explain the scale of this phenomenon. After recapitulating the various factors of some importance, we find that the probability of a dome rise from a previously static layer is low, in the time lapse we are interested in (100,000 years). Such a rise would have to be triggered by important changes in the sedimentation, erosion or tectonic activity on the site.

Additional information

Authors: BILLAUX D, BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE);ROBELIN C BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE), BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES, ORLEANS (FRANCE)
Bibliographic Reference: EUR 9866 FR (1985) MF, VOLUME 4, 45 P., BFR 150, BLOW-UP COPY BFR 225, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989126032101 / Last updated on: 1989-01-01
Category: PUBLICATION
Available languages: fr
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