Hydro-mechanical behaviour of shallow Opalinus Clay shale

Alessio Ferrari, Silvio B. Giger, Alessio Ferrari, Eleonora Crisci, Lyesse Laloui

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

In 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 (< 70 m) 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, ≈300 m, and Schlattingen borehole, ≈900 m). 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.
Lingua originaleEnglish
pagine (da-a)214-227
Numero di pagine14
RivistaEngineering Geology
Volume251
Stato di pubblicazionePublished - 2019

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Shale
shale
Clay
clay
Boreholes
repository
Erosion
borehole
Radioactive waste disposal
erosion
bedding plane
void ratio
Clay minerals
compressibility
Compressibility
exhumation
waste disposal
Consolidation
radioactive waste
swelling

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cita questo

Ferrari, A., Giger, S. B., Ferrari, A., Crisci, E., & Laloui, L. (2019). Hydro-mechanical behaviour of shallow Opalinus Clay shale. Engineering Geology, 251, 214-227.

Hydro-mechanical behaviour of shallow Opalinus Clay shale. / Ferrari, Alessio; Giger, Silvio B.; Ferrari, Alessio; Crisci, Eleonora; Laloui, Lyesse.

In: Engineering Geology, Vol. 251, 2019, pag. 214-227.

Risultato della ricerca: Article

Ferrari, A, Giger, SB, Ferrari, A, Crisci, E & Laloui, L 2019, 'Hydro-mechanical behaviour of shallow Opalinus Clay shale', Engineering Geology, vol. 251, pagg. 214-227.
Ferrari A, Giger SB, Ferrari A, Crisci E, Laloui L. Hydro-mechanical behaviour of shallow Opalinus Clay shale. Engineering Geology. 2019;251:214-227.
Ferrari, Alessio ; Giger, Silvio B. ; Ferrari, Alessio ; Crisci, Eleonora ; Laloui, Lyesse. / Hydro-mechanical behaviour of shallow Opalinus Clay shale. In: Engineering Geology. 2019 ; Vol. 251. pagg. 214-227.
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abstract = "In 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 (< 70 m) 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, ≈300 m, and Schlattingen borehole, ≈900 m). 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.",
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AU - Ferrari, Alessio

AU - Giger, Silvio B.

AU - Ferrari, Alessio

AU - Crisci, Eleonora

AU - Laloui, Lyesse

PY - 2019

Y1 - 2019

N2 - In 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 (< 70 m) 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, ≈300 m, and Schlattingen borehole, ≈900 m). 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.

AB - In 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 (< 70 m) 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, ≈300 m, and Schlattingen borehole, ≈900 m). 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.

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