Temperature cycling and its effect on mechanical behaviours of high-porosity chalks

T. Voake*, A. Nermoen, R. I. Korsnes, I. L. Fabricius

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Temperature history can have a significant effect on the strength of water-saturated chalk. In this study, hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between each stress cycle, compared to the samples tested at a constant temperature. The total accumulated strain during a stress cycle and the irreversible strain are reported. Chalk samples from Kansas (USA) and Mons (Belgium), with different degrees of induration (i.e. amount of contact cementation), were used. The samples were saturated with equilibrated water (polar) and non-polar Isopar H oil to quantify water weakening. All samples tested during 10 stress cycles with varying temperature (i.e. temperature cycled in between each stress cycle) accumulated more strain than those tested at constant temperatures. All the stress cycles were performed at 30 °C. The two chalk types behaved similarly when saturated with Isopar H oil, but differently when saturated with water. When saturated with water, the stronger Kansas chalk accumulated more total strain and more irreversible strain within each stress cycle than the weaker Mons chalk.
Original languageEnglish
JournalJournal of Rock Mechanics and Geotechnical Engineering
Volume11
Issue number4
Pages (from-to)749-759
Number of pages11
ISSN1674-7755
DOIs
Publication statusPublished - 2019

Keywords

  • Geotechnical Engineering and Engineering Geology
  • Anisotropic thermal expansion
  • Elastoplastic partitioning
  • Strain accumulation due to temperature and stress cycles

Cite this

@article{2867eff7d8f74919bd9e041eaae4d5c0,
title = "Temperature cycling and its effect on mechanical behaviours of high-porosity chalks",
abstract = "Temperature history can have a significant effect on the strength of water-saturated chalk. In this study, hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between each stress cycle, compared to the samples tested at a constant temperature. The total accumulated strain during a stress cycle and the irreversible strain are reported. Chalk samples from Kansas (USA) and Mons (Belgium), with different degrees of induration (i.e. amount of contact cementation), were used. The samples were saturated with equilibrated water (polar) and non-polar Isopar H oil to quantify water weakening. All samples tested during 10 stress cycles with varying temperature (i.e. temperature cycled in between each stress cycle) accumulated more strain than those tested at constant temperatures. All the stress cycles were performed at 30 °C. The two chalk types behaved similarly when saturated with Isopar H oil, but differently when saturated with water. When saturated with water, the stronger Kansas chalk accumulated more total strain and more irreversible strain within each stress cycle than the weaker Mons chalk.",
keywords = "Geotechnical Engineering and Engineering Geology, Anisotropic thermal expansion, Elastoplastic partitioning, Strain accumulation due to temperature and stress cycles",
author = "T. Voake and A. Nermoen and Korsnes, {R. I.} and Fabricius, {I. L.}",
year = "2019",
doi = "10.1016/j.jrmge.2018.11.010",
language = "English",
volume = "11",
pages = "749--759",
journal = "Journal of Rock Mechanics and Geotechnical Engineering",
issn = "1674-7755",
publisher = "Kexue Chubanshe",
number = "4",

}

Temperature cycling and its effect on mechanical behaviours of high-porosity chalks. / Voake, T.; Nermoen, A.; Korsnes, R. I.; Fabricius, I. L.

In: Journal of Rock Mechanics and Geotechnical Engineering, Vol. 11, No. 4, 2019, p. 749-759.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Temperature cycling and its effect on mechanical behaviours of high-porosity chalks

AU - Voake, T.

AU - Nermoen, A.

AU - Korsnes, R. I.

AU - Fabricius, I. L.

PY - 2019

Y1 - 2019

N2 - Temperature history can have a significant effect on the strength of water-saturated chalk. In this study, hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between each stress cycle, compared to the samples tested at a constant temperature. The total accumulated strain during a stress cycle and the irreversible strain are reported. Chalk samples from Kansas (USA) and Mons (Belgium), with different degrees of induration (i.e. amount of contact cementation), were used. The samples were saturated with equilibrated water (polar) and non-polar Isopar H oil to quantify water weakening. All samples tested during 10 stress cycles with varying temperature (i.e. temperature cycled in between each stress cycle) accumulated more strain than those tested at constant temperatures. All the stress cycles were performed at 30 °C. The two chalk types behaved similarly when saturated with Isopar H oil, but differently when saturated with water. When saturated with water, the stronger Kansas chalk accumulated more total strain and more irreversible strain within each stress cycle than the weaker Mons chalk.

AB - Temperature history can have a significant effect on the strength of water-saturated chalk. In this study, hydrostatic stress cycles are applied to understand the mechanical response of chalk samples exposed to temperature cycling between each stress cycle, compared to the samples tested at a constant temperature. The total accumulated strain during a stress cycle and the irreversible strain are reported. Chalk samples from Kansas (USA) and Mons (Belgium), with different degrees of induration (i.e. amount of contact cementation), were used. The samples were saturated with equilibrated water (polar) and non-polar Isopar H oil to quantify water weakening. All samples tested during 10 stress cycles with varying temperature (i.e. temperature cycled in between each stress cycle) accumulated more strain than those tested at constant temperatures. All the stress cycles were performed at 30 °C. The two chalk types behaved similarly when saturated with Isopar H oil, but differently when saturated with water. When saturated with water, the stronger Kansas chalk accumulated more total strain and more irreversible strain within each stress cycle than the weaker Mons chalk.

KW - Geotechnical Engineering and Engineering Geology

KW - Anisotropic thermal expansion

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KW - Strain accumulation due to temperature and stress cycles

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