ABSTRACT
With the choice of the constitutive model, the necessity is to calibrate its parameters with reference to the in situ rock mass behaviour. This task might represent the drawback of advanced constitutive models. In fact, in situ creep tests involve operational difficulties and suitable scaling rules, allowing for estimating the rock mass parameters on the basis of laboratory data, have yet to be validated. In some cases, when severely squeezing conditions arise and performance monitoring is adopted systematically, convergence and stress measurements could provide data for the back analysis of the creep phenomenon.
