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- W235220963 abstract "Condition indicators for liquefaction are mainly given by the soil properties gained from gradation curves and empirically, using relationships between number of SPT blows or CPT results and liquefaction potential. Recent earthquake events as well as recent studies have shown that silty soils, which had been thought to be less prone to liquefaction than sands, are still likely to liquefy. Therefore, the influence of the loading path, and in particular the loading velocity and loading direction, on the liquefaction susceptibility of silty soils will be discussed. It can be deduced that the earthquake profile as well as the boundary conditions related to loading functions have a significant influence on the liquefaction susceptibility. Also liquefaction observed in the field is not only to be related to the liquefaction of the soil under the free field boundary conditions but the reduction of effective stress during an earthquake has to be regarded in terms of the actual stress interplay in the subsoil. The “starting” conditions as well as the influence of the loading function (frequency and form, stress ratios) will be discussed based on a literature review, which will be enhanced in the future with results obtained with the new cyclic hollow cylinder apparatus. The results will be introduced in a new concept of risk management for earthquakes for buildings and lifelines in an urban environment. RESUME Des indicateurs de condition pour la liquefaction sont principalement donnes par les proprietes du sol, par exemple, par les courbes granulometriques, ou par correlation empirique des resultats de reconnaissance de site. Dans des tremblements de terre recents, ces indicateurs de condition ont ete trouves moins valides car les sols limoneux ont montre une probabilite elevee de liquefaction. Pour expliquer ceci, l'influence du chemin de chargement (vitesse de chargement et direction de chargement) sur la susceptibilite de liquefaction des sols limoneux doit etre discutee car ils ont une influence significative. En outre, la liquefaction observee dans un environnement urbain doit etre consideree en termes d'interaction de tensions dans le sous-sol au-dessous d'une fondation ou dans une pente. L'influence de la fonction de chargement (frequence et forme, rapports de tensions) sera discutee a base sur une recherche dans la litterature, et sera amelioree a l'avenir avec des resultats obtenus avec le nouvel appareillage cyclique de cylindre creux de l'institut de geotechnique. Les resultats seront presentes dans un nouveau concept de gestion des risques pour des tremblements de terre pour des bâtiments et des lignes de sauvetage dans un environnement urbain." @default.
- W235220963 created "2016-06-24" @default.
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- W235220963 date "2005-01-01" @default.
- W235220963 modified "2023-09-27" @default.
- W235220963 title "Chemin et vitesse de chargement comme indicateurs de condition potentiels pour la liquéfaction des sols limoneux" @default.
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