Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions
Current geomechanical applications imply nonisothermal processes of unsaturated geomaterials, in most cases following stress paths different from the classical triaxial compression often used in laboratory testing. Although the effects of temperature, suction, and stress-path direction (Lode's angle) on the strength of geomaterials have been investigated independently, an integrated analysis combining the three effects has not yet been performed. In this paper, a thermoplastic constitutive model for unsaturated conditions that accounts for the effect of Lode's angle on the strength of geomaterials is presented. The yield surface evolves-shrinking for increasing temperature and expanding for increasing suction-and has its maximum strength for triaxial compression and its minimum for triaxial extension. Examples that can be related to geoenergy applications highlight the importance of accounting for the effects of temperature, suction, and Lode's angle on the evolution of the strength of geomaterials. Numerical results show that not considering these effects may give rise to misleading predictions of the strength of geomaterials. © 2017 American Society of Civil Engineers.
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Format: | artículo biblioteca |
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American Society of Civil Engineers
2017-07-01
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Subjects: | Constitutive modelling, Lode's angle, Plane strain, Thermohydromechanical couplings, Thermoplasticity, |
Online Access: | http://hdl.handle.net/10261/151604 http://dx.doi.org/10.13039/501100000781 |
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dig-idaea-es-10261-1516042020-05-25T16:39:24Z Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions Vilarrasa, Víctor Parisio, Francesco Laloui, Lyesse European Research Council Constitutive modelling Lode's angle Plane strain Thermohydromechanical couplings Thermoplasticity Current geomechanical applications imply nonisothermal processes of unsaturated geomaterials, in most cases following stress paths different from the classical triaxial compression often used in laboratory testing. Although the effects of temperature, suction, and stress-path direction (Lode's angle) on the strength of geomaterials have been investigated independently, an integrated analysis combining the three effects has not yet been performed. In this paper, a thermoplastic constitutive model for unsaturated conditions that accounts for the effect of Lode's angle on the strength of geomaterials is presented. The yield surface evolves-shrinking for increasing temperature and expanding for increasing suction-and has its maximum strength for triaxial compression and its minimum for triaxial extension. Examples that can be related to geoenergy applications highlight the importance of accounting for the effects of temperature, suction, and Lode's angle on the evolution of the strength of geomaterials. Numerical results show that not considering these effects may give rise to misleading predictions of the strength of geomaterials. © 2017 American Society of Civil Engineers. V.V. acknowledges support from the ‘EPFL Fellows’ fellowship programme co-funded by Marie Curie, FP7 Grant agreement no. 291771. We would also like to acknowledge financial support from NAGRA (Swiss National Cooperative for the Disposal of Radioactive Waste). Peer reviewed 2017-06-19T07:36:26Z 2017-06-19T07:36:26Z 2017-07-01 artículo http://purl.org/coar/resource_type/c_6501 International Journal of Geomechanics 17(7): 04016152 (2017) http://hdl.handle.net/10261/151604 10.1061/(ASCE)GM.1943-5622.0000851 http://dx.doi.org/10.13039/501100000781 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/291771 Postprint 10.1061/(ASCE)GM.1943-5622.0000851 Sí open American Society of Civil Engineers |
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Constitutive modelling Lode's angle Plane strain Thermohydromechanical couplings Thermoplasticity Constitutive modelling Lode's angle Plane strain Thermohydromechanical couplings Thermoplasticity Vilarrasa, Víctor Parisio, Francesco Laloui, Lyesse Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
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Current geomechanical applications imply nonisothermal processes of unsaturated geomaterials, in most cases following stress paths different from the classical triaxial compression often used in laboratory testing. Although the effects of temperature, suction, and stress-path direction (Lode's angle) on the strength of geomaterials have been investigated independently, an integrated analysis combining the three effects has not yet been performed. In this paper, a thermoplastic constitutive model for unsaturated conditions that accounts for the effect of Lode's angle on the strength of geomaterials is presented. The yield surface evolves-shrinking for increasing temperature and expanding for increasing suction-and has its maximum strength for triaxial compression and its minimum for triaxial extension. Examples that can be related to geoenergy applications highlight the importance of accounting for the effects of temperature, suction, and Lode's angle on the evolution of the strength of geomaterials. Numerical results show that not considering these effects may give rise to misleading predictions of the strength of geomaterials. © 2017 American Society of Civil Engineers. |
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European Research Council |
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European Research Council Vilarrasa, Víctor Parisio, Francesco Laloui, Lyesse |
format |
artículo |
topic_facet |
Constitutive modelling Lode's angle Plane strain Thermohydromechanical couplings Thermoplasticity |
author |
Vilarrasa, Víctor Parisio, Francesco Laloui, Lyesse |
author_sort |
Vilarrasa, Víctor |
title |
Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
title_short |
Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
title_full |
Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
title_fullStr |
Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
title_full_unstemmed |
Strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
title_sort |
strength evolution of geomaterials in the octahedral plane under nonisothermal and unsaturated conditions |
publisher |
American Society of Civil Engineers |
publishDate |
2017-07-01 |
url |
http://hdl.handle.net/10261/151604 http://dx.doi.org/10.13039/501100000781 |
work_keys_str_mv |
AT vilarrasavictor strengthevolutionofgeomaterialsintheoctahedralplaneundernonisothermalandunsaturatedconditions AT parisiofrancesco strengthevolutionofgeomaterialsintheoctahedralplaneundernonisothermalandunsaturatedconditions AT lalouilyesse strengthevolutionofgeomaterialsintheoctahedralplaneundernonisothermalandunsaturatedconditions |
_version_ |
1777669288374566912 |