Academic literature on the topic 'Comportement poromécanique'
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Journal articles on the topic "Comportement poromécanique":
Karami, M. H., M. Sibai, and J. F. Shao. "Une étude expérimentale du comportement poromécanique d'une roche fragile saturée." Revue Française de Génie Civil 4, no. 1 (January 2000): 109–42. http://dx.doi.org/10.1080/12795119.2000.9692276.
Dissertations / Theses on the topic "Comportement poromécanique":
Karami, Mohammad Hassan. "Etude expérimentale du comportement poromécanique d'une roche endommageable." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-147.pdf.
Zhang, Yuhao. "Etude expérimentale et modélisation du comportement poromécanique d'une roche argileuse." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN061.pdf.
This work has been carried out in the context of studies for the geological disposal of radioactive waste. The main objective is to complete previous works on the characterization of poromechanical behavior of the Callovo-Oxfordian (COx) clay, which is envisaged as the geological barrier in France. The work is composed of two parts.In the first part, an experimental study is carried out. Laboratory tests on saturated samples are carried out to estimate Biot's coefficient under hydrostatic compression on the one hand, and its evolution during deviatoric loading on the other. Tests were then conducted under undrained conditions. Two loading paths were considered: triaxial compression with constant confining pressure and axial extension with constant mean stress. In particular, we studied the variation in pore pressure as a function of deviatoric loading and its influence on the material's resistance to fracture.The second part is devoted to numerical modelling. A new plasticity criterion is proposed, taking into account the effect of the Lode angle. The validity of the effective Terzaghi stress in the plastic deformation and fracture criterion is studied. Based on this criterion, a plastic model is formulated. The associated parameters are identified. The proposed model is used to simulate several series of laboratory tests
Ramos, Da Silva Mikaël. "Etude théorique et expérimentale du comportement poromécanique des roches non saturées." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210116.
Cette étude expérimentale se propose donc de contribuer à une meilleure compréhension du comportement hydromécanique de matériaux rocheux partiellement saturés. Pour ce faire, la démarche suivie a consisté à se baser sur des techniques et outils bien établis pour les sols (meubles), et à les adapter aux matériaux rocheux. Dans ce contexte, une première étude a été menée sur un matériau rocheux argileux, le schiste de Beringen, et a permis d’évaluer l’influence de la succion pour les états de compression simple.
Suite à cette première étude, d’autres états de contrainte ont été envisagés, principalement au moyen de l’essai triaxial. Le contrôle de la succion en cours d’essai a demandé d’importantes transformations au système triaxial déjà disponible au laboratoire. En parallèle, un nouvel équipement, comprenant notamment un contrôle de la succion par la méthode de translation d’axes, a été conçu et mis en service. La suite du programme expérimental a été réalisée sur une roche poreuse et très homogène :le calcaire de Sorcy.
A l’état sec, les résultats d’essais triaxiaux et polyaxiaux ont permis la construction de surfaces de charge tridimensionnelles. En plan méridien, comme pour d’autres roches poreuses, la résistance augmente avec la pression de confinement lorsque celle-ci reste assez faible (inférieure à 15 MPa environ) ;le comportement est fragile. Aux confinements plus élevés, le comportement devient ductile. En plan octaédrique, la forme de la surface évolue depuis le triangle jusqu’au cercle dans la partie fragile, puis continue à évoluer vers un triangle (inversé par rapport au premier) dans le domaine ductile.
En conditions saturées, un ensemble cohérent de paramètres poroélastiques a été mesuré, parmi lesquels le coefficient de Biot (qui a été évalué à environ 0.85). La variabilité de ces paramètres entre échantillons et en fonction de l’état de contrainte a été examinée. Dans le domaine poroplastique, c’est la contrainte effective de Terzaghi qui se révèle contrôler le comportement mécanique, malgré que le coefficient de Biot soit inférieur à 1. En plan méridien, l’enveloppe obtenue pour le matériau saturé se rapproche de celle du matériau sec, moyennant une normalisation par rapport à sa longueur horizontale. Ceci suggère que la prise en compte des conditions non saturées pourrait se faire, comme souvent pour les sols, par l’ajout d’un axe supplémentaire :la succion.
En conditions non saturées, les essais réalisés en conditions isotropes à succion contrôlée montrent une forte augmentation du module d’incompressibilité drainé avec la pression de confinement et une faible augmentation avec la succion. Ceci tend à conforter les hypothèses adoptées.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Rahal, Saïd. "Influence de l'anisotropie induite par la fissuration sur le comportement poromécanique de géomatériaux." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0015/document.
Cracking in structures significantly affects their durability, water transfer and ultimately their safety. This structural disorder provides a preferential path for the penetration of fluids and contributes significantly to the deterioration of structures. This work provides a macroscopic model intended to predict the change of permeability with respect to cracking. The proposed development is implemented within an orthotropic damage model. It assumes an initially isotropic permeability tensor which becomes anisotropic with damage. The objectivity of the hydraulic response with respect to the finite element mesh is ensured by considering the crack localization problem when building the permeability tensor. The model was used to simulate the flow rate through a reinforced concrete element subjected to tensile loading, as well as to simulate the excavation and the poro-visco-plastic consolidation of an underground gallery designed to store radioactive waste. For the latter application, the induced anisotropy of Biot’s tensor was taken into account using the results provided by the homogenization theory. The simulation results were compared with experimental measurements
Zeng, Qiang. "Comportement poromécanique des matériaux cimentaires soumis au gel-dégel en présence de sels : modélisation et expérimentation." Phd thesis, Ecole Nationale des Ponts et Chaussées, 2011. http://tel.archives-ouvertes.fr/tel-00688191.
Samudio, Marcos. "Modélisation d'un ciment pétrolier depuis le jeune âge jusqu'à l'état durci : cinétique d'hydratation et comportement poromécanique." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1041/document.
The prediction of the performance of cement-based materials requires a holistic model integrating the progressive hydration of the material, the coupling between water consumption and strains, and the history of the applied loadings. This is particularly important when modelling the behavior of the cement sheath in oil wells which is subjected, from its earliest age and during its lifetime, to a wide range of mechanical and thermal loadings that could have a detrimental effect on its future mechanical properties. The aim of the present thesis is to provide a complete modelling framework for the hydro-mechanical behavior of an oil well cement paste from its earliest age to its hardened state. The manuscript is divided in two parts. Part I: Hydration kinetics The evolution of the most significant physical properties of cement-based materials is controlled by the advancement of the hydration reactions. Two different modelling approaches are presented:- A theoretical framework for the modelling of cement hydration is developed as an extension of classical nucleation and growth models. The proposed multi-component model explicitly considers anhydrous cement and water as independent phases participating in the reaction. We also introduce a growth rate that encompasses linear as well as parabolic diffusion growth in a single continuous mathematical form. The formulation naturally introduces some of the most relevant parameters of cement paste mixtures, such as the cement powder composition, mass densities of the different phases, water to cement ratio, chemical shrinkage and hydrates properties. The different rate-controlling mechanisms can be identified and interpreted on the basis of the proposed physical model.- A general hydration kinetics law based on the theory of solid phase transformations is proposed. This formulation is compared with the evolution laws found in the literature and helps providing a physical explanation that could shed light on the understanding of cement hydration kinetics. In both cases, the kinetic models are calibrated over a series of experimental results in order to properly evaluate the quality of the predictions. Part II: Mechanical constitutive law The mechanical behavior of cement paste is described in the framework of reactive porous media. The cement paste is modelled as a multi-phase porous material with an elastic-viscous-plastic constitutive law, with mechanical parameters depending on the hydration degree. Furthermore, the cement paste chemical shrinkage and pore water consumption during hydration are accounted for in the determination of the macroscopic strains. The evolution of the poroelastic parameters of the cement paste during hydration is calculated by means of a micromechanical upscaling model. An asymmetric yield surface with compressive and tensile caps is adopted for the elastoplastic regime, with hardening mechanisms considering both the cumulated plastic deformations and the hydration degree. The viscous behaviour is based on the notions of solidification theory. A water retention curve is introduced to account for the potential desaturation of the material during hydration. The model parameters for a class G cement paste are evaluated by simulating the results of mechanical loading experiments in a device specially designed for testing the thermo-mechanical behavior of cement paste from the early stages of hydration. The results show that the proposed model predicts with good accuracy the response of a hydrating cement paste when subjected to various loading paths from its early age. The importance of the loading history is outlined, as well as the need for the accurate determination of the effective stresses throughout the life of the material
Lion, Maxime. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier. Etudes expérimentales." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2004. http://tel.archives-ouvertes.fr/tel-00276734.
Lion, Maxime. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier : études expérimentales." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-61-62.pdf.
Xi, Chen. "Etude expérimentale du comportement poromécanique des argilites du COx : influences de l’anisotropie initiale et du chemin de chargement." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I071.
The Callovo-Oxfordian (COx) claystone has been selected as a potential host rock for underground radioactive waste repository in France. The present thesis is devoted to experimental investigation of the poro-mechanical behavior of COx claystone. The emphasis is put on the study of influences of structural anisotropy and loading path. Both instantaneous and time dependent behaviors are considered. For this purpose, a series of laboratory investigations including axial extension creep tests with different loading orientations, shear creep tests on fractured samples with gas permeability evolution measurement, tests for determination of Biot’s and Skempton’s coefficients, lateral decompression and axial extension tests with poroplastic cycles and oedometric tests under different drainage conditions. From the results obtained, it is found that the poromechanical behavior of COx claystone is strongly affected by structural anisotropy, loading path and water saturation degree. The time-dependent deformation is also an important property of the COx claystone. The gas permeability evolution of fractured samples is influenced by various factors including confining pressure and self-sealing ability of clayey rock
Ouffroukh, Hichem. "Comportement hydromécanique d'une roche granulaire et localisations des déformations." Marne-la-vallée, ENPC, 2004. http://www.theses.fr/2004ENPC0039.