Thermo-mechanical volume change behaviour of Opalinus Clay

Alessio Ferrari, Alessio Ferrari, Valentina Favero, Lyesse Laloui

Risultato della ricerca: Article

17 Citazioni (Scopus)

Abstract

The paper examines the thermo-mechanical volume change behaviour of Opalinus Clay in relation to different stress conditions and overconsolidation ratio (OCR) values and evaluates the impact of temperature on some hydro-mechanical properties of this material. To this aim, a focused experimental campaign consisting in high-temperature/high-pressure oedometric tests has been carried out. The results show that the thermo-mechanical volume change behaviour of Opalinus Clay is heavily affected by the OCR: thermal expansion is found when the heating is carried out at high OCR, whereas irreversible thermal compaction is observed when heat is applied at a vertical effective stress that is sufficiently close to the vertical effective yield stress. The study of the thermal cyclic behaviour shows that expansive irreversible strains can occur upon first heating at high OCR and that a reversible behaviour follows during subsequent thermal cycles. The experimental results reveal an impact of temperature on yielding: a decrease in the yield threshold is detected when compression is applied at high temperature with respect to the yield threshold found at low temperature. Compressibility and swelling indexes are not significantly influenced by thermal changes, as well as the oedometric modulus and the secondary compression coefficient, whereas consolidation processes are found to occur faster at high temperature. The obtained results are presented in this paper together with a description of the testing device and experimental procedure employed.
Lingua originaleEnglish
pagine (da-a)15-25
Numero di pagine11
RivistaINTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
Volume90
Stato di pubblicazionePublished - 2016

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overconsolidation
volume change
Clay
clay
compression
heating
Temperature
thermal expansion
Compaction
effective stress
compressibility
swelling
consolidation
Heating
mechanical property
compaction
temperature
Compressibility
Consolidation
Thermal expansion

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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Thermo-mechanical volume change behaviour of Opalinus Clay. / Ferrari, Alessio; Ferrari, Alessio; Favero, Valentina; Laloui, Lyesse.

In: INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, Vol. 90, 2016, pag. 15-25.

Risultato della ricerca: Article

Ferrari, Alessio ; Ferrari, Alessio ; Favero, Valentina ; Laloui, Lyesse. / Thermo-mechanical volume change behaviour of Opalinus Clay. In: INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES. 2016 ; Vol. 90. pagg. 15-25.
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AU - Favero, Valentina

AU - Laloui, Lyesse

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AB - The paper examines the thermo-mechanical volume change behaviour of Opalinus Clay in relation to different stress conditions and overconsolidation ratio (OCR) values and evaluates the impact of temperature on some hydro-mechanical properties of this material. To this aim, a focused experimental campaign consisting in high-temperature/high-pressure oedometric tests has been carried out. The results show that the thermo-mechanical volume change behaviour of Opalinus Clay is heavily affected by the OCR: thermal expansion is found when the heating is carried out at high OCR, whereas irreversible thermal compaction is observed when heat is applied at a vertical effective stress that is sufficiently close to the vertical effective yield stress. The study of the thermal cyclic behaviour shows that expansive irreversible strains can occur upon first heating at high OCR and that a reversible behaviour follows during subsequent thermal cycles. The experimental results reveal an impact of temperature on yielding: a decrease in the yield threshold is detected when compression is applied at high temperature with respect to the yield threshold found at low temperature. Compressibility and swelling indexes are not significantly influenced by thermal changes, as well as the oedometric modulus and the secondary compression coefficient, whereas consolidation processes are found to occur faster at high temperature. The obtained results are presented in this paper together with a description of the testing device and experimental procedure employed.

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KW - Geotechnical Engineering and Engineering Geology

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KW - Shales

KW - Thermo-mechanical behaviour

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