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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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**Back-calculation of the Saint-Alban A test embankment with a new modelling approach in LEM.** / Lehtonen, V.; Länsivaara, T.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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*Proceedings of the The 17th Nordic Geotechnical Meeting, Reykjavik Iceland: 25th - 28th of May 2016.*pp. 691-699, NORDIC GEOTECHNICAL MEETING, 1/01/00.

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*Proceedings of the The 17th Nordic Geotechnical Meeting, Reykjavik Iceland: 25th - 28th of May 2016*(pp. 691-699)

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TY - GEN

T1 - Back-calculation of the Saint-Alban A test embankment with a new modelling approach in LEM

AU - Lehtonen, V.

AU - Länsivaara, T.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

UR - http://www.ngm2016.com/uploads/2/1/7/9/21790806/076-024-ngm_2016_-_back-calculation_of_the_saint-alban_a_test_embankment_with_a_new_modelling_approach_in_lem_lehtonen_lansivaara.pdf

UR - http://www.ngm2016.com/

M3 - Conference contribution

SP - 691

EP - 699

BT - Proceedings of the The 17th Nordic Geotechnical Meeting, Reykjavik Iceland

ER -