| Issue |
E3S Web Conf.
Volume 195, 2020
4th European Conference on Unsaturated Soils (E-UNSAT 2020)
|
|
|---|---|---|
| Article Number | 04011 | |
| Number of page(s) | 6 | |
| Section | Special Session on Energy Geotechnics | |
| DOI | https://doi.org/10.1051/e3sconf/202019504011 | |
| Published online | 16 October 2020 | |
Swelling behavior of unsaturated claystone/ bentonite mixtures
1 Agence nationale pour la gestion des déchets radioactifs (ANDRA), 92290 Châtenay-Malabry, France
2 Université de Lorraine - LEMTA, UMR 7563 CNRS, 54500 Vandœuvre-lès-Nancy, France
* Corresponding author: marvin.middelhoff@univ-lorraine.fr
This laboratory experimental program investigated the impact of variations in the expansive mineral content, the grain size distribution of employed bentonite, the initial dry density and the selected hydration path on the water retention characteristics and swelling properties of processed Callovo-Oxfordian claystone and its mixtures with MX80 bentonite. The French reference concept for the disposal of nuclear waste in deep sedimentary rock formations envisages the reemployment of excavated material as backfill material, which is installed in situ by means of conventional compaction techniques. The investigations were of special interest as the major issues involving in situ compacted backfill materials were portrayed. Experiments showed that the impact of variations in the dry density on the water retention characteristics of all materials vanished as suctions exceeded 100 MPa. The negligible impact of variations in the initial dry density on the collapse behavior of claystone/ bentonite mixtures remained questionable.
© The Authors, published by EDP Sciences 2020
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