dc.contributor
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.contributor
Universitat Politècnica de Catalunya. GGMM - Grup de Geotècnia i Mecànica de Materials
dc.contributor.author
Song, Fei
dc.contributor.author
Gens Solé, Antonio
dc.contributor.author
Collico, Stefano
dc.contributor.author
Grgic, Dragan
dc.contributor.author
Wang, Huaning
dc.identifier
Song, F. [et al.]. Fully coupled THM constitutive model for clay rocks: formulation and application to laboratory tests. "Journal of rock mechanics and geotechnical engineering", Abril 2025, vol. 17, núm. 4, p. 1941-1960.
dc.identifier
https://hdl.handle.net/2117/422297
dc.identifier
10.1016/j.jrmge.2024.03.037
dc.description.abstract
This study presents a fully coupled thermo-hydro-mechanical (THM) constitutive model for clay rocks. The model is formulated within the elastic-viscoplasticity framework, which considers nonlinearity and softening after peak strength, anisotropy of stiffness and strength, as well as permeability variation due to damage. In addition, the mechanical properties are coupled with thermal phenomena and accumulated plastic strains. The adopted nonlocal and viscoplastic approaches enhance numerical efficiency and provide the possibility to simulate localization phenomena. The model is validated against experimental data from laboratory tests conducted on Callovo-Oxfordian (COx) claystone samples that are initially unsaturated and under suction. The tests include a thermal phase where the COx specimens are subjected to different temperature increases. A good agreement with experimental data is obtained. In addition, parametric analyses are carried out to investigate the influence of the hydraulic boundary conditions (B.C.) and post-failure behavior models on the THM behavior evolution. It is shown that different drainage conditions affect the thermally induced pore pressures that, in turn, influence the onset of softening. The constitutive model presented constitutes a promising approach for simulating the most important features of the THM behavior of clay rocks. It is a tool with a high potential for application to several relevant case studies, such as thermal fracturing analysis of nuclear waste disposal systems.
dc.description.abstract
This work was funded by the European Union's Horizon 2020 research and innovation programme under a grant agreement (Grant No. 847593), partially supported by the Fundamental Research Funds for the Central Universities (Grant No. 22120240029). The authors thank the organizing Committee of Unsat-Waste2023 for their invitation to contribute to the special issue “Unsat-Waste2023".
dc.description.abstract
Peer Reviewed
dc.description.abstract
Postprint (published version)
dc.format
application/pdf
dc.publisher
Science Press
dc.relation
https://www.sciencedirect.com/science/article/pii/S1674775524003196
dc.relation
info:eu-repo/grantAgreement/EC/H2020/847593/EU/European Joint Programme on Radioactive Waste Management/EURAD
dc.rights
http://creativecommons.org/licenses/by/4.0/
dc.rights
Attribution 4.0 International
dc.subject
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de roques
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Unsaturated/saturated conditions
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THM coupling processes
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Thermal pressurization
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Constitutive model
dc.title
Fully coupled THM constitutive model for clay rocks: formulation and application to laboratory tests
