On présente dans cette Note les résultats dʼessais de chargement axial dʼune sonde-pieu instrumentée dans des massifs de sable reconstitués en chambre dʼétalonnage, destinés à étudier lʼévolution du frottement latéral local dans des chargements cycliques, menés à grands nombres de cycles (105 cycles). Après une phase initiale de dégradation du frottement latéral (radoucissement cyclique), on met en évidence une phase de ré-augmentation du frottement (durcissement cyclique), qui se poursuit jusquʼaux grands nombres de cycles. Le mécanisme global de dégradation suivi du renforcement est interprété en mettant en avant la compétition entre deux mécanismes concurrents, qui sont la diminution de contrainte normale effective moyenne due au phénomène de contractance cyclique (responsable de la dégradation) et le phénomène de dilatance empêchée, qui sʼaccroît avec la densification progressive du sable dans la zone dʼinterface autour de la sonde.
This Note presents the results of axial loading tests carried out on an instrumented “pile-probe” jacked into sand, in a calibration chamber, aimed at studying the evolution of local friction, up to very large numbers of cycles (105 cycles). After an initial phase of friction degradation (cyclic softening), a subsequent phase of mobilized friction reinforcement (cyclic hardening) is observed, which continues to develop up to very large numbers of cycles. The complete mechanism of shear degradation followed by the reinforcement phase is interpreted based on the competition between two mechanisms which are the mean normal effective stress decrease due to cyclic contractancy phenomenon, responsible for cyclic softening, and the progressive densification of the sand within the interface zone around the probe, which becomes predominant after a certain number of cycles, resulting in a cyclic hardening mechanism due to partially constrained dilatancy phenomenon.
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Mots-clés : Milieux granulaires, Pieu, Frottement, Chambre dʼétalonnage, Sable, Chargement cyclique, Ramollissement cyclique, Durcissement cyclique
Hadj Bekki 1 ; Jean Canou 2 ; Brahim Tali 2 ; Jean-Claude Dupla 2 ; Ali Bouafia 1
@article{CRMECA_2013__341_6_499_0,
author = {Hadj Bekki and Jean Canou and Brahim Tali and Jean-Claude Dupla and Ali Bouafia},
title = {Evolution of local friction along a model pile shaft in a calibration chamber for a large number of loading cycles},
journal = {Comptes Rendus. M\'ecanique},
pages = {499--507},
publisher = {Elsevier},
volume = {341},
number = {6},
year = {2013},
doi = {10.1016/j.crme.2012.11.012},
language = {en},
}
TY - JOUR AU - Hadj Bekki AU - Jean Canou AU - Brahim Tali AU - Jean-Claude Dupla AU - Ali Bouafia TI - Evolution of local friction along a model pile shaft in a calibration chamber for a large number of loading cycles JO - Comptes Rendus. Mécanique PY - 2013 SP - 499 EP - 507 VL - 341 IS - 6 PB - Elsevier DO - 10.1016/j.crme.2012.11.012 LA - en ID - CRMECA_2013__341_6_499_0 ER -
%0 Journal Article %A Hadj Bekki %A Jean Canou %A Brahim Tali %A Jean-Claude Dupla %A Ali Bouafia %T Evolution of local friction along a model pile shaft in a calibration chamber for a large number of loading cycles %J Comptes Rendus. Mécanique %D 2013 %P 499-507 %V 341 %N 6 %I Elsevier %R 10.1016/j.crme.2012.11.012 %G en %F CRMECA_2013__341_6_499_0
Hadj Bekki; Jean Canou; Brahim Tali; Jean-Claude Dupla; Ali Bouafia. Evolution of local friction along a model pile shaft in a calibration chamber for a large number of loading cycles. Comptes Rendus. Mécanique, Volume 341 (2013) no. 6, pp. 499-507. doi : 10.1016/j.crme.2012.11.012. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.11.012/
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