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Geotechnical analysis of heat exchanger piles / Christoph Knellwolf in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 890-902 Titre : Geotechnical analysis of heat exchanger piles Type de document : texte imprimé Auteurs : Christoph Knellwolf, Auteur ; Hervé Peron, Auteur ; Laloui, Lyesse, Auteur Année de publication : 2012 Article en page(s) : pp. 890-902 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Foundation  design  Pile  foundations  Temperature  effects  Heating  Cooling  Thermal  stress  Skin  friction Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : There is currently a lack of established calculation methods for the geotechnical design of heat exchanger piles, although the technology is experiencing a fast expansion. Instead of quantifying the effects of temperature changes on the static behavior of heat exchanger piles, the common geotechnical practice is to apply a large overall security factor. This is done to be on the side of safety with respect to thermal effects. The few existing in situ experiments show that applying a thermal load induces a significant change in the stress-strain state of a pile. This paper presents a geotechnical numerical analysis method based on the load-transfer approach that assesses the main effects of temperature changes on pile behavior. The method is validated on the basis of in situ measurements of the loads and deformations experienced by heat exchanger test piles. The occurrence of critical design situations is further discussed. Some conclusions are formulated on concrete failure and the full mobilization of the pile shaft friction and base resistance during the operation of the heat exchange system. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p890_s1?isAuthorized=no [article] Geotechnical analysis of heat exchanger piles [texte imprimé] / Christoph Knellwolf, Auteur ; Hervé Peron, Auteur ; Laloui, Lyesse, Auteur . - 2012 . - pp. 890-902. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 890-902 Mots-clés : Foundation  design  Pile  foundations  Temperature  effects  Heating  Cooling  Thermal  stress  Skin  friction Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : There is currently a lack of established calculation methods for the geotechnical design of heat exchanger piles, although the technology is experiencing a fast expansion. Instead of quantifying the effects of temperature changes on the static behavior of heat exchanger piles, the common geotechnical practice is to apply a large overall security factor. This is done to be on the side of safety with respect to thermal effects. The few existing in situ experiments show that applying a thermal load induces a significant change in the stress-strain state of a pile. This paper presents a geotechnical numerical analysis method based on the load-transfer approach that assesses the main effects of temperature changes on pile behavior. The method is validated on the basis of in situ measurements of the loads and deformations experienced by heat exchanger test piles. The occurrence of critical design situations is further discussed. Some conclusions are formulated on concrete failure and the full mobilization of the pile shaft friction and base resistance during the operation of the heat exchange system. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p890_s1?isAuthorized=no