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Back-calculation of the Saint-Alban A test embankment with a new modelling approach in LEM

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of the The 17th Nordic Geotechnical Meeting, Reykjavik Iceland
Subtitle of host publication25th - 28th of May 2016
Number of pages9
ISBN (Electronic)978-9935-24-002-6
Publication statusPublished - 2016
Publication typeA4 Article in a conference publication
Duration: 1 Jan 1900 → …


Period1/01/00 → …


To facilitate the continued use of limit equilibrium method (LEM) in stability design of embankments on soft clays, the new calculation method “Hybrid su” (HSU) has been developed. It is used to derive undrained shear strength from effective strength parameters, or to predict the excess pore pressure at failure. The HSU method uses an anisotropic effective stress soil model with volumetric hardening, from which a closed form solution for the effective mean stress at failure p’f is derived. This in turn is used to derive the anisotropic undrained shear strength (for use in total stress analyses), or excess pore pressure (for use in undrained effective stress analyses). The model accounts for factors such as anisotropy, consolidation state, volumetric hardening and to some extent, rate effects. An advantage of the model over traditional undrained effective stress calculations is that the overestimation of shear strength at F > 1 is avoided.

Publication forum classification

Field of science, Statistics Finland