A number of constitutive models have been proposed along time in order to describe the mechanical behavior of rock salt. The basic formulation of these models relies, in general, on the description of deformation mechanisms in the macro or the micro scale. The present note aims at providing a framework for the development of models to describe the creep behavior of rock salts based upon continuum thermodynamics principles. This note provides the theoretical basis and, based on the proposed framework, presents the development of a two-mechanism model that describes transient and steady-state creep of rock salt. Results obtained with this model are presented as well as a discussion on the main features of the proposed formulation.

随着时间的推移，人们提出了许多本构模型来描述岩盐的力学行为。这些模型的基本公式通常依赖于对宏观或微观尺度变形机制的描述。本说明旨在为模型的开发提供一个框架，以根据连续热力学原理描述岩盐的蠕变行为。本说明提供了理论基础，并基于所提出的框架，介绍了描述岩盐瞬态和稳态蠕变的双机制模型的发展。介绍了使用该模型获得的结果，并讨论了所提出的配方的主要特征。