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<p>This paper presents the Salt Elasticity and Viscoplasticity (SEV) model for the damage-free (microcrack-free) thermomechanical behavior of rock salt. The model captures transient and steady-state viscoplastic phenomena with two deformation branches: a pressure solution branch and a dislocation glide branch. The dislocation glide branch uses kinematic hardening for heterogeneously distributed dislocations and isotropic hardening for uniformly distributed dislocations. By transitioning from kinematic-dominated hardening at low stresses to isotropic dominated hardening at high stresses, the model is shown to accurately describe salt’s hardening behavior for simple monotonic proportional stress paths at stresses ranging from 2&#xa0;MPa to 80&#xa0;MPa and temperatures ranging from 25<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\hspace{0.1em}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mspace width="1.00006pt" /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C to 100<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\hspace{0.1em}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mspace width="1.00006pt" /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>C. Within these ranges, the SEV model captures a hardening transition between low and medium stresses and another hardening transition between medium and high stresses, both of which are rarely addressed in the literature. The model can also represent further transient behaviors neglected by many other models, such as reverse (inverse) creep, the Bauschinger effect, and the response to non-proportional stress paths. These features make the model well suited to simulating the damage-free gradual closure of undisturbed underground cavities, as well as the transient behavior of cyclically loaded cavities, such as gas storage caverns.</p>

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A Model for the Damage-Free Thermomechanical Behavior of Rock Salt

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Benjamin Reedlunn

摘要

This paper presents the Salt Elasticity and Viscoplasticity (SEV) model for the damage-free (microcrack-free) thermomechanical behavior of rock salt. The model captures transient and steady-state viscoplastic phenomena with two deformation branches: a pressure solution branch and a dislocation glide branch. The dislocation glide branch uses kinematic hardening for heterogeneously distributed dislocations and isotropic hardening for uniformly distributed dislocations. By transitioning from kinematic-dominated hardening at low stresses to isotropic dominated hardening at high stresses, the model is shown to accurately describe salt’s hardening behavior for simple monotonic proportional stress paths at stresses ranging from 2 MPa to 80 MPa and temperatures ranging from 25 \(\hspace{0.1em}^{\circ }\) ∘ C to 100 \(\hspace{0.1em}^{\circ }\) ∘ C. Within these ranges, the SEV model captures a hardening transition between low and medium stresses and another hardening transition between medium and high stresses, both of which are rarely addressed in the literature. The model can also represent further transient behaviors neglected by many other models, such as reverse (inverse) creep, the Bauschinger effect, and the response to non-proportional stress paths. These features make the model well suited to simulating the damage-free gradual closure of undisturbed underground cavities, as well as the transient behavior of cyclically loaded cavities, such as gas storage caverns.