Thermo-Hydro-Mechanical characterization of OPHELIE backfill mixture

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Within the framework of the OPHELIE surface mock-up test,a Belgian reference repository concept for high level radioactive waste disposal—an exhaustive experimental program under oedometer conditions was carried out to characterize the thermo-hydro-mechanical(THM) response of the backfill material used. This material,pre-compacted in high-density blocks,was made up of 60% FoCa clay,35% sand and 5% graphite in a dry mass basis. Besides a brief description of the temperature and suction controlled equipment used,selected experimental results related to water retention properties,compressibility on loading at different total suctions and temperatures,as well as swelling capacity and collapsibility on soaking and heating,are also presented and interpreted.


Original languageEnglish
Pages (from-to)733-740
JournalChinese Journal of Rock Mechanics and Engineering
Issue number4
Publication statusPublished - 15 Apr 2006


  • high-level radioactive waste(HLW);geological disposal;thermo-hydro-mechanical(THM) coupling;Ophelie backfill mixture

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