Abstract
Barodesy is a constitutive model based on proportional paths and the asymptotic behaviour of soil. It was originally developed for sand in 2009 by Kolymbas, and a version for clay was introduced in 2012. A shortcoming of former barodetic models was that tensile stresses can occur for certain dilative deformations. In this article, an improved version of barodesy for clay and a simplified calibration procedure are proposed. Basic features are shown, and simulations of element tests are compared with experimental data of several clay types.
Highlights
Barodesy is a constitutive model based on proportional paths and the asymptotic behaviour of soil
The constitutive model for soil called barodesy, proposed by Kolymbas [9,10,11,12], is based on the asymptotic behaviour of granulates expressed by the two rules proposed by Goldscheider [6], which have been experimentally confirmed for sand and clay [3, 6, 26, 27]: (1) starting at the stress-free state, T 1⁄4 0, proportional strain paths1 lead to proportional stress paths; and (2) starting at T 61⁄4 0, proportional strain paths lead asymptotically to the corresponding proportional stress paths starting at T 1⁄4 0
The R-function according to Medicus et al [21] explicitly prohibits tensile stresses and is chosen as one of the equations for the improved version of barodesy for clay
Summary
This means that proportional stress paths function as attractors. R is a tensorial argument of normalized stretching D0 and is chosen according to Medicus et al [21]:
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