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Several origins of gas generation have been identified from underground radioactive waste disposal. Underground disposal sites can be disturbed by the gas pressure buildup inducing cracks and modification in the water flow behaviour. The objective of this project is to study the impact of gas generation and migration. Software has been developed to predict the mechanical behaviour of the host rock when gas pressure builds up. This has the ability to detect crack initiation and follow crack propagation, the prediction being confirmed by experimental data. The hydraulic impact of gas migration has been studied by simulating twelve differing scenarios of gas migration. The simulation shows the gas will reach the aquifer and the time scale of such migration to the biosphere depends on the host rock characteristics which play a major role in the gas migration. The safety assessment of the radioactive waste disposal is a trade off between lowering flow velocities and better confining gas in cavity. This report gives an overview of the results of modelling hydraulic effects and mechanical effects and experimental results.

Additional information

Authors: MANAI T, Geostock, Rueil-Malmaison (FR)
Bibliographic Reference: EUR 16753 EN (1996) 143pp., FS, ECU 15.00
Availability: Available from the (2)
ISBN: ISBN 92-827-5920-2
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