Asymptotic state boundaries and peak states in barodesy for clay

Abstract

With constant stretching of soil, the memory is gradually swept out and the so-called asymptotic states are reached: asymptotic states are proportional stress paths as well as particular curves in the void ratio against the mean stress plane. The so-called asymptotic state boundary surface (ASBS) serves as a graphical representation for asymptotic states. In contrast to asymptotic states, peak states of drained triaxial tests are states with vanishing stiffness. In this paper, an explicit formulation of the ASBS and peak state envelope of barodesy are introduced. Different clay types are compared with barodesy as well as with predictions by hypoplasticity. The peak states of the experiments confirm the results obtained with barodesy and hypoplasticity. It is shown that different to elastoplastic models, the ASBS does not include peak states in barodesy and hypoplasticity. In addition to standard axisymmetric simulations, investigations are also carried out in the deviatoric plane with the focus on plane strain failure.