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Abstract

The object of this work is to show the effect of the gradual arrival of an ice cap on compaction of a sedimentary system, and the ways in which fluid flow within the system is affected. The finite elements method was used to assess the hydromechanical action of the formations. The action is considered under isothermal conditions; this presupposes that the ice cap would only arrive in the distant future, when the thermal effect of the deposits has largely subsided. Analysis of the results, applying the hypotheses adopted, shows firstly that there is still only limited compaction of strata. This is explained by the relatively high speed at which the ice cap advances, preventing total consolidation of the sedimentary strata. Secondly, it shows that a sub-horizontal flow is generated, in the direction in which the ice cap advances. This latter point can be taken into account in analysing the safety of storage sites. Finally, the residual excess pressure of the underground water due to overloading should also be considered in the hypothetical event of rapid reheating taking place (with the disappearance of the ice cap and permafrost soil).

Additional information

Authors: MODARESSI H, BRGM, ORLEANS (FR);GENTIER S, BRGM, ORLEANS (FR);FOURNIGUET J, BRGM, ORLEANS (FR);PEAUDECERF P BRGM, ORLEANS (FR), BRGM, ORLEANS (FR)
Bibliographic Reference: EUR 12503 FR (1990) VOLUME 3, 77 PP., FS, ECU 7.50 AVAILABLE FROM THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
Record Number: 1989128030800 / Last updated on: 1990-11-09
Category: PUBLICATION
Available languages: fr
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