Acoustic emission in host-rock material for radioactive waste disposal: comparison between clay and rock salt |
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| Authors: | A Lavrov A Vervoort Y Filimonov M Wevers J Mertens |
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| Affiliation: | (1) Catholic University of Leuven, Faculty of Applied Sciences, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium,;(2) Moscow State Mining University, Physical and Engineering Department, Moscow, Russia,;(3) Strength Laboratory, Podzemgazprom Ltd, Moscow, Russia,;(4) Catholic University of Leuven, Faculty of Applied Sciences, Department of Metallurgy and Materials Engineering, 3001 Leuven, Belgium,;(5) Catholic University of Leuven, Faculty of Sciences, Department of Geography and Geology, Division of Historical Geology, 3000 Leuven, Belgium, |
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| Abstract: | The use of clay masses for radioactive waste disposal requires a comprehensive analysis of fracture processes in clay. Acoustic
emission (AE) was used to obtain a better insight into damage evolution during uniaxial loading of Boom Clay specimens. A
comparison of AE in clay and rock salt shows a much lower AE activity in clay. This, together with the higher attenuation,
would inhibit the use of the AE technique for large-scale in-situ monitoring in clay masses. Cyclic uniaxial tests showed
that, similarly to rock salt, clay exhibits a very well-pronounced Kaiser effect in AE with Felicity ratios around unity.
The Kaiser effect takes place at different loading stages (before and at the flow limit) and, during reloading, it coincides
with the deformation curve inflection. Further research is required to study the applicability of the Felicity ratio as a
measure of the intensity of healing processes in clay.
Electronic Publication |
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| Keywords: | Radioactive waste disposal Clay Rock salt Acoustic emission Uniaxial compression Cracks |
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