Salt-constitutive modeling using mechanism maps

Abstract

Numerous constitutive models have been proposed for the low temperature creep of salt. This work was the first to develop such a model within the framework of a deformation-mechanism map. Use of this framework permits unfolding of the rather complicated low temperature steady-state creep behavior into three simple responses involving separate regimes with individual controlling mechanisms. The constitutive model developed in this report incorporates primary (transient) creep as a two parameter modification to the steady-state creep equations. The constitutive model presented can be applied to deep mines and, more importantly, to design of the petroleum storage and radioactive waste isolation facilities.