000263686 001__ 263686
000263686 005__ 20190619220201.0
000263686 0247_ $$2doi$$a10.1016/j.enggeo.2019.01.016
000263686 037__ $$aARTICLE
000263686 245__ $$aHydro-mechanical behaviour of shallow Opalinus Clay shale
000263686 260__ $$c2019-01-24
000263686 269__ $$a2019-01-24
000263686 336__ $$aJournal Articles
000263686 520__ $$aIn Switzerland, Opalinus Clay shale has been selected as the host formation for radioactive waste disposal. The minimum required depth of the repository is related to the long-lasting isolation required for the disposal (1 million years). During this period, possible erosion scenarios affecting the repository need to be analysed. Opalinus Clay from shallow depths (< 70m) was sourced from a borehole in Northern Switzerland, where the formation was affected by a considerable exhumation process. This work aims to investigate the impact of the mentioned phenomenon on the hydro-mechanical behaviour of Opalinus Clay through one-dimensional consolidation and permeability measurements. Laboratory tests on intact and remoulded specimens sourced from shallow depths were performed and compared to previous studies of specimens sourced at greater depths (Mont Terri, ≈300m, and Schlattingen borehole, ≈900m). The results revealed a limited impact of the erosion phenomenon on the analysed aspects of Opalinus Clay at the laboratory scale. The compressibility and swelling indexes were shown to strongly depend on the clay-mineral content of the specimens. The impact of the diagenesis on the current void ratio of the formation was also highlighted. The mechanical response in the loading directions, perpendicular and parallel to the bedding planes, revealed a marked anisotropy in the low stress range, which reduces for high stress values.
000263686 6531_ $$aOpalinus Clay
000263686 6531_ $$aShale
000263686 6531_ $$aOne-dimensional consolidation and hydraulic conductivity
000263686 6531_ $$aGeological exhumation
000263686 6531_ $$aAnisotropy
000263686 6531_ $$aDiagenesis
000263686 700__ $$g252678$$aCrisci, Eleonora$$0249404
000263686 700__ $$g178175$$aFerrari, Alessio$$0242683
000263686 700__ $$aGiger, Silvio
000263686 700__ $$0240226$$aLaloui, Lyesse$$g105611
000263686 773__ $$tEngineering Geology$$j251$$q214-227
000263686 8560_ $$feleonora.crisci@epfl.ch
000263686 909C0 $$zPasquier, Simon$$xU10264$$pLMS$$mlyesse.laloui@epfl.ch$$0252080
000263686 909CO $$ooai:infoscience.epfl.ch:263686$$pENAC$$particle
000263686 960__ $$aeleonora.crisci@epfl.ch
000263686 961__ $$afantin.reichler@epfl.ch
000263686 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000263686 980__ $$aARTICLE
000263686 981__ $$aoverwrite