Effect of dynamic loads on piles in frozen soils

• Main Author: Parameswaran, V. R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: University of Alberta Publishing 1984
• Subjects: permafrost; soils; frozen soils; dynamic loads; piles; creep rate; foundations; pergélisol; sol; sol gelé; sollicitation dynamique; pieu; taux de fluage; fondation (ouvrage); alternating stress effects; piles' displacement rates; soil creep rate; bearing capacity reduction; foundations in permafrost
• Online Access: https://nrc-publications.canada.ca/eng/view/ft/?id=2c573ed1-e168-42f4-a49f-969f86bca2b7; https://nrc-publications.canada.ca/eng/view/object/?id=2c573ed1-e168-42f4-a49f-969f86bca2b7; https://nrc-publications.canada.ca/fra/voir/objet/?id=2c573ed1-e168-42f4-a49f-969f86bca2b7

An alternating stress as small as 5% of the static stress was found to accelerate the displacement rates of piles subjected to long-term loads in frozen soils, as well as the creep rate of frozen soil samples subjected to uniaxial loading under compression. This effect essentially reduces the bearing capacity of piles in frozen soils, and has to be taken into consideration in the design of foundations in permafrost areas. On a constaté qu'une charge alternée aussi faible que 5% de la contrainte statique accélère le taux de déplacement des pieux enfoncés dans les sols gelés et supportant des charges de longue durée, ainsi que le taux de fluage des échantillons de sol gelé soumis au chargement uniaxial en compression. Cet effet réduit la capacité portante des pieux enfoncés dans les sols gelés et doit être pris en considération pour les calculs de fondations dans les régions de pergélisol. Peer reviewed: Yes NRC publication: Yes