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of GEOMAS Laboratory - Geomechanics, Materials, Structure

 

The GEOMAS laboratory (Geomechanics, Materials, Structure) is a research team (EA 7495) under the supervision of INSA Lyon.

The laboratory is located on the Lyon-tech la Doua campus in Villeurbanne and brings together professors and researchers from the Civil Engineering field, particularly in the fields of structural mechanics, materials and geomechanics.

The laboratory's objective is to conduct excellent academic research, with partnership-based research, aimed at meeting industrial and societal needs in the fields of construction in the broadest sense (geomechanics, materials and structures) in interaction with their environment.

 

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Keywords

Jeune âge Couplage ARGILE DALLE BETON ARME Plastic hinges Plasticity Concrete Band-gaps Out-of-plane loading Rammed earth Méthode des éléments discrets Renforcement Enriched continuum mechanics Experiments Aluminate de calcium Reflection Civil engineering Ettringite binder Ciment alumineux Subdomain decomposition Corresponding author Wave Propagation Moving load Coupling Fresh wood Ciment riche en mayénite SEDIMENT Generalized continua Aciers transversaux Bifurcation 74B05 classical linear elasticity Alexiosaivaliotis@insa-lyonfr Béton armé Rockfill structures BENTONITE Oedometric compression 74M25 micromechanics Hydratation Modélisation Contrainte mécanique Cement rich in mayenite 74J05 linear waves Anchor Admixture D Simulation numérique Second-order work 74J20 wave scattering EXPERIMENTATION Grain breakage Matériau granulaire Chape autonivelante AOP Éléments finis Interface Stirrups Materials Adsorption Relaxed micromorphic model 74A30 nonsimple materials Anisotropy Modeling Adsoption Rupture 75J15 surface waves Matériaux Size effects Instability Impact Metamaterials Cisaillement Discrete element method Incremental response Composite coats Granular material Reinforcement Enriched continua CISAILLEMENT Génie civil Wave-propagation Stiffness Transmission Masonry Finite element modeling Pullout test 74A60 micromechanical theories Confinement Reinforced concrete 74Q15 effective constitutive equations 1 Alexios Aivaliotis Finite elements Absorbing layers Shear Cinétique 74J10 bulk waves Hydration Wave propagation Damage Failure BRIQUE Endommagement

 

 

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Soutenance de thèse de Lianxin HU

 (31/03/2021)  

In order to model the behavior of geometarials under complex loadings, several researches have done numerous experimental works and established relative constitutive models for decades. An important feature of granular materials is that the relationship between stress and strain especially in elastic domain is not linear, unlike the responses of typical metal or rubber. It has been also found that the stress-strain response of granular materials shows the characteristics of cross-anisotropy, as well as the non- linearities. Besides, the stress-induced anisotropy occurs expectedly during the process of disturbance on soils, for example, the loads or displacements. In this work, a new model which is a combination of Houlsby hyperelastic model and elastoplastic Plasol model was proposed. This new model took into account the non-linear response of stress and strain in both elastic and plastic domain, and the anisotropic elasticity was also well considered. Moreover, the overflow problems of plastic strain in plastic part was calibrated by a proper integration algorithm. Later, new model was verified by using numerical method and compared with laboratory experiments in axisymmetric triaxial conditions. The comparison results showed a good simulation effect of new model which just used one single set of parameters for a specific soil in different confining pressure situations. Then the analysis of new model internal variable, i.e., pressure exponent, illustrated that the value of pressure exponent which corresponds to the degree of anisotropy had an obvious effect on the stress-strain response. Moreover, this kind of effect is also affected by the density and drainage condition of samples. Basing on new model, a safety factor which refers to the second-order work criterion was adopted and tested in axisymmetric model and actual slope model. It showed that the negative value or dramatic decreasing of global normalized second-order work occurs accompanying with a local or global failure with a burst of kinetic energy.

Thématique: 
Date Publication: 
Mercredi, Décembre 16, 2020
Chapeau: 

Liaxin a soutenu sa thèse "Micromechanics of Granular Materials During Complex Loadings", le 15/12/2020 (en visio), sous la direction de A. Daouadji et F. Prunier. Felicitations à lui!


Soutenance de thèse de Danai Panagiota TYRI

 (31/03/2021)  

Soutenance de thèse de Chaimaa Jaafari

 (31/03/2021)  

QUEL AVENIR POUR LES FONDATIONS D'EOLIENNE?

 (28/03/2021)  

Angela Madeo, Pr. à GEOMAS, lauréate d'une ERC

 (10/12/2020)