EVALUATION OF THE INFLUENCE OF ELASTO-VISCOPLASTIC SCALING FUNCTIONS ON MODELLING TIME-DEPENDENT BEHAVIOUR OF NATURAL CLAYS
- Resource Type
- Journal Article
- Authors
- MINNA KARSTUNEN; PIERRE-YVES HICHER; ZHEN-YU YIN
- Source
- SOILS AND FOUNDATIONS. 2010, 50(2):203
- Subject
- (IGC: A1/D6/E13)
anisotropy
clay
constitutive equation of soil
creep
sensitivity
time effect
- Language
- English
- ISSN
- 0038-0806
1881-1418
In this paper, we study the influence of the scaling functions in Perzyna's type elasto-viscoplastic models for predicting time-dependent behaviour of natural clays. The constitutive models were developed based on the overstress theory with different scaling functions and on the elastoplastic model S-CLAY1S which accounts for induced anisotropy and gradual degradation of apparent soil bonds. Laboratory tests were simulated on natural clays under one-dimensional and triaxial conditions to evaluate the scaling function influence in the modelling of the strain-rate effect on soil strength and creep effect. The influence of scaling functions on modelling the time-dependent behaviour under pressuremeter condition was also numerically examined. This test is treated as an example of a boundary value problem, which also allows us to see if this in situ testing is capable of deriving the parameters controlling the time-dependent behaviour.