JRMGE / Vol 15 / Issue 6

Article

A thermodynamic-based model for modeling thermo-elastoplastic behaviors of saturated clayey soils considering bound water dehydration

Mohammadhossein Sojoudi, Biao Li

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Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Quebec, Canada


2023, 15(6): 1535-1546. doi:10.1016/j.jrmge.2022.09.008


Received: 2022-05-16 / Revised: 2022-09-09 / Accepted: 2022-09-15 / Available online: 2022-10-17

2023, 15(6): 1535-1546.

doi:10.1016/j.jrmge.2022.09.008


Received: 2022-05-16

Revised: 2022-09-09

Accepted: 2022-09-15

Available online: 2022-10-17


Abstract:

The non-isothermal deformation of soft mudrocks or clay soils is one of the most critical issues in energy and environmental related geotechnics. Clay-related geomaterials hold complex microstructure and mineral composition, which brings difficulty in investigating their thermo-mechanical behaviors. Previous studies pay little attention to the difference between a thermal plastic strain and the strain from clay dehydration. In this study, a new constitutive model is proposed for describing the thermo-elastoplastic behaviors of clayey soils under water-saturated condition. The effect of temperature variation and mechanical loading on elastoplastic strains and dehydration are investigated. The thermodynamics laws and the unconventional plasticity are applied to quantify the thermo-mechanical behavior. The irreversible strain is captured by using Cam-Clay plasticity and subloading yield surface concept. The dehydration strain is described by utilizing a novel method based on generalized thermodynamics approach and Helmholtz free energy function. The internal variables, and the first and second laws of thermodynamics are applied in the model. The hardening rule is established by implementing the laws of physical conservation, energy dissipation, and plastic flow. The proposed model is validated using specially designed thermal consolidation tests on laboratory prepared heavily consolidated clayey soils and some published data of clayey soils with different geological origins.

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Keywords: Thermo-mechanical process, Subloading yield surface, Energy methods, Clay-bound water, Dehydration

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Mohammadhossein Sojoudi, Biao Li, 2023. A thermodynamic-based model for modeling thermo-elastoplastic behaviors of saturated clayey soils considering bound water dehydration. J. Rock Mech. Geotech. Eng. 15 (6), 1535-1546.

Author(s) Information

Mohammadhossein Sojoudi

Mohammadhossein Sojoudi is a Ph.D. candidate in the Department of Building, Civil, and Environmental Engineering (BCEE) at Concordia University, Montreal, Canada. His study interests include: (1) constitutive modeling of coupled hydro-mechanical behavior of geomaterials; and (2) the energy-based modeling of the thermo-hydro-mechanical behavior of geomaterials in geothermal energy storage projects.