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by Peng Jing
Institution: | Universit de Strasbourg |
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Year: | 2017 |
Keywords: | Matriaux granulaires; Triaxial chargements rpts; Dformation permanente; Dformation rversible; Teneur en eau; Teneur en fines; Succion matricielle; Thorie de l'tat limite; Granular material; Repeated load triaxial test; Permanent deformation; Resili |
Posted: | 02/01/2018 |
Record ID: | 2159578 |
Full text PDF: | http://www.theses.fr/2017STRAD008 |
Les matriaux granulaires sont souvent utiliss dans les chausses faible trafic, pour la ralisation des couches d'assise non lies. L'objectif de la thse est une meilleure comprhension du comportement hydromcanique des matriaux granulaires insaturs sous charge rpte en tenant compte des diffrents effets coupls: teneur en eau et teneur en fines. Une srie d'essais triaxiaux chargements rpts (TCR) est ralise avec les diffrents chantillons de sable de Missillac remodels diffrentes teneurs en eau et en fines pour caractriser les comportements de dformation permanent et rsilient. En outre, les courbes de rtention sont obtenues par des essais de succion. Puis, sur la base des rsultats exprimentaux, les modles de dformations permanentes et rversibles existants sont amliors pour prendre en compte les teneurs en fines et en eau variables. Finalement, le comportement de l'tat limite du sable Missillac est estim avec les effets des teneurs en fines et en eau. Granular materials are often used in low traffic pavement structures as unbound granular base and sub-base layers. The objective of this context is a better understanding of hydromechanical behaviour (deformation behaviour mainly) of the unsaturated granular materials under repeated loading taking into account the various coupled effects: water content and fine content. A series of RLTTs are conducted with the different remolded Missillac sand samples at different water contents and fine contents to characterize the permanent and resilient deformation behaviour. Besides, the soil water retention curves (SWRCs) are obtained by suction measurement. Then, based on the experimental results, the existing permanent and resilient deformation models are improved to accommodate to the changeable fine content and water content. In the end, the shakedown behaviour of Missillac sand is estimated with the effects of fine content and water content.Advisors/Committee Members: Chazallon, Cyrille (thesis director), Migault, Bernard (thesis director).
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