Influence of anisotropy and rotation on probabilistic slope stability analysis by RFEM
نویسندگان
چکیده
This paper describes random finite element analyses of anisotropic 2-D undrained clay slopes with randomly distributed shear strength. The analyses take into account the rotational orientation of the principle axes of anisotropy that might be observed in natural slopes with tilted stratification. Particular focus is placed on the special case in which the spatial correlation in one of the orthogonal directions is set to infinity. It is found that rotated anisotropy can have a very significant effect on the probability of slope failure. Insight into the reasons for this sensitivity is provided by examining the nature of the failure mechanisms generated in the graphical output displays. RÉSUMÉ Cet article décrit des analyses par éléments finis aléatoires des 2-D pentes undrained anisotropes d'argile avec la résistance au cisaillement aléatoirement distribuée. Les analyses prennent en considération l'orientation de rotation des haches de principe de l'anisotropie qui pourraient être observées dans les pentes normales avec la stratification inclinée. L'accent particulier est placé sur le cas spécial dans lequel la corrélation spatiale dans une des directions orthogonales est placée à l'infini. On le constate que l'anisotropie tournée peut exercer un effet très significatif sur la probabilité de l'échec de pente. L'aperçu des raisons de cette sensibilité est fourni en examinant la nature des mécanismes d'échec produits dans les affichages graphiques de rendement.
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Enhancement of random finite element method in reliability analysis and risk assessment of soil slopes using Subset Simulation
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