Dilatancy Criteria for Salt Cavern Design: A Comparison Between Stress- and Strain-Based Approaches.

Autor: Labaune, P., Rouabhi, A., Tijani, M., Blanco-Martín, L., You, T.
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Zdroj: Rock Mechanics & Rock Engineering; Feb2018, Vol. 51 Issue 2, p599-611, 13p
Abstrakt: This paper presents a new approach for salt cavern design, based on the use of the onset of dilatancy as a design threshold. In the proposed approach, a rheological model that includes dilatancy at the constitutive level is developed, and a strain-based dilatancy criterion is defined. As compared to classical design methods that consist in simulating cavern behavior through creep laws (fitted on long-term tests) and then using a criterion (derived from short-terms tests or experience) to determine the stability of the excavation, the proposed approach is consistent both with short- and long-term conditions. The new strain-based dilatancy criterion is compared to a stress-based dilatancy criterion through numerical simulations of salt caverns under cyclic loading conditions. The dilatancy zones predicted by the strain-based criterion are larger than the ones predicted by the stress-based criteria, which is conservative yet constructive for design purposes. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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