Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 2021 | public
Journal Article

Undrained instability detection under general stress conditions


This work proposes a criterion for the detection of undrained instability under multiaxial stress conditions at elemental level. To do so, it develops the application of the proposed criterion to the implicit implementation of a multiaxial elastoplastic constitutive model, which considers the effect of inherent anisotropy for the simulation of monotonic loading. The general criterion proposed is validated through the simulation of undrained torsional shear tests in Toyoura sand. The application of the criterion shows precision at onset of both liquefaction and phase transformation mechanisms, in general stress conditions through the variation of the intermediate principal stress ratio b. By considering different ranges of the initial void ratio and confining pressure, the representation of the collapse surface in three-dimensional stress space and in critical state space is shown and the phase transformation surface is presented in the critical state space. The interaction of the collapse and phase transformation surfaces offers the possibility of better understanding the influence of the initial void ratio and the confining pressure in the mechanical behavior of geomaterials in undrained conditions and the occurrence of the related instability processes.

Additional Information

© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021. Received 04 June 2020; Accepted 29 May 2021; Published 28 June 2021.

Additional details

August 22, 2023
October 23, 2023