Enhanced double-mechanism creep laws for salt rocks

The double-mechanism creep law (DM model) is an empirical creep constitutive model widely employed in Brazilian salt rock mechanics. This model often presents good performance in steady-state creep prediction. However, transient creep is not accounted for, and whenever early creep estimates are impo...

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Bibliographic Details
Published in:Acta geotechnica 2018-12, Vol.13 (6), p.1329-1340
Main Authors: Firme, Pedro A. L. P., Brandao, Nuno B., Roehl, Deane, Romanel, Celso
Format: Article
Language:English
Subjects:
Complex Fluids and Microfluidics
Computer simulation
Constitutive models
Creep rate
Creep tests
Deformation
Deformation mechanisms
Engineering
Formulations
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Materials creep
Mathematical models
Research Paper
Rock mechanics
Rocks
Simulators
Soft and Granular Matter
Soil Science & Conservation
Solid Mechanics
Solifluction
Steady state
Steady state models
Strain rate
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Summary:The double-mechanism creep law (DM model) is an empirical creep constitutive model widely employed in Brazilian salt rock mechanics. This model often presents good performance in steady-state creep prediction. However, transient creep is not accounted for, and whenever early creep estimates are important, the contribution of this phase might be meaningful. This work adds value by presenting two alternatives to account for transient creep in the DM model. The first alternative couples the transient function from Sandia’s multi-mechanism deformation model to the DM model steady-state creep rate (EDMT model). The second alternative couples the DM model response to Norton’s power law when the strain rate given by the latter remains lower than the one from the former (EDMP model). These models can be implemented in numerical simulators at small code extensions of the DM model implementations. Applications from previous works by the authors are revisited to validate the formulations based on experimental data. EDMT and EDMP models differ in the formulation of transient creep and, consequently, in the time of transition between the transient and the steady-state phases. Both methods were successful in treating transient creep and in simulating experimental results.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-018-0689-7