Comptes Rendus
no. 10-11
Discrete numerical investigation of the ratcheting phenomenon in granular materials
[Analyse numérique discrète du phénomène de cliquet dans les matériaux granulaires]
Francesco Calvetti1  ; Claudio di Prisco1
1 Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Comptes Rendus. Mécanique, Volume 338 (2010) no. 10-11, pp. 604-614.

Plusieurs travaux géotechniques, tels que les remblais des chemins de fer et des routes, les fondations offshore et celles des machines vibrantes, sont affectées par l'accumulation progressive des déformations irréversibles. Cela représente la réorganisation progressive des particules sous chargement cyclique, ce qui est communément appelé dans la littérature comme effet de cliquet. Ce phénomène est bien connu mais tout difficile à quantifier a travers d'un modèle constitutif approprié. Dans cet article, ce phénomène sera abordé en employant la méthode des éléments discrets pour décrire l'évolution de la structure induite par les perturbations cycliques mécaniques. Plusieurs essais numériques sont effectués afin d'évaluer l'influence du niveau de chargement et de la densité relative sur la réponse mécanique. Les analyses numériques sont destinées à fournir une base expérimentale pour concevoir une approche simplifiée basée sur la plasticité généralisée. En particulier par des sondages incrémentaux l'évolution du potentiel plastique et des paramètres d'écrouissage seront étudiés.

Several relevant geotechnical works, such as railway and road embankments, offshore foundations and vibrating machine foundations, are affected by the progressive accumulation of irreversible settlements. These latter represent the macroscopic evidence of the progressive rearrangement of particles under cycling loading, which is commonly referred to, in the literature, as ratcheting. This phenomenon is well known, but it is quite difficult to describe it by means of an appropriate constitutive model. As a consequence, the evaluation of durability of the aforementioned structures remains an open problem. In this article, the phenomenon will be approached by employing a Distinct Element model capable of describing the evolution of the microstructure induced by cyclic mechanical perturbations. Several analyses are performed in order to stress the influence of both the stress level and loading history on the mechanical response of a numerical model of a sand specimen. The numerical analyses are intended to provide an experimental background for conceiving a simplified macro approach based on generalised plasticity theory. In particular by means of probe test the plastic potential and the hardening parameters will be defined as a function of the current stress state and loading history.

Publié le :
DOI : 10.1016/j.crme.2010.09.006
Keywords: Granular materials, Incremental behaviour, Distinct elements, Cyclic loading, Ratcheting
Mot clés : Matériaux granulaires, Comportement incrémentale, Éléments discrets, Chargement cyclique, Cliquet
Francesco Calvetti 1 ; Claudio di Prisco 1

1 Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy 
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Francesco Calvetti; Claudio di Prisco. Discrete numerical investigation of the ratcheting phenomenon in granular materials. Comptes Rendus. Mécanique, Volume 338 (2010) no. 10-11, pp. 604-614. doi : 10.1016/j.crme.2010.09.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.09.006/

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