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Artykuły w czasopismach na temat "Argile – Séchage"
Hamès, Véronique, Jean-Pierre Lautridou, André Ozer i Albert Pissart. "Variations dilatométriques de roches soumises à des cycles « humidification-séchage »". Géographie physique et Quaternaire 41, nr 3 (18.12.2007): 345–54. http://dx.doi.org/10.7202/032690ar.
Pełny tekst źródłaRozprawy doktorskie na temat "Argile – Séchage"
Sadeghi, Mehrad. "Contribution à l'étude du retrait au cours d'un séchage microonde". Toulouse, INPT, 1989. http://www.theses.fr/1989INPT047H.
Pełny tekst źródłaChemkhi, Saber. "Séchage d'un milieu déformable non saturé : Modélisation du couplage hygromécanique". Phd thesis, Bordeaux 1, 2008. http://pastel.archives-ouvertes.fr/pastel-00004690.
Pełny tekst źródłaLamloumi, Raja. "Comportement des matériaux minéraux de grande diffusion lors du séchage : étude expérimentale et modélisation". Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0076/document.
Pełny tekst źródłaThe aim of this work is to study behavior of low cost mineral materials during convective drying: experiment and theoretical modeling. A first part is devoted to the physical and chemical characterization of materials. These are two Tunisian clays (AX and AR), a porcelain clay mixture (BC) and two clay mixtures (MG and CA) commercialized by the company BIBLIONTEK, one of which is a composite of clay and cellulose fibers (CA). Measurements of thermodynamic equilibrium, transfer proprieties and the mechanical proprieties were then made in order to understand the continued hydric, thermal and mechanical behavior of the materials. Experimental characterization of the drying kinetics for the MG and CA clay mixtures (MG and CA) was made on single layer samples or individual samples at different dry temperatures, relative humidities and air speeds. These kinetics were used to validate two theoretical models. The first is two dimensions of a deformable material saturated in water during convective drying was applied to the case of MG clay mixture. The spatial distributions of water content in the material, temperature and mechanical stress were simulated as a function of time and interpreted in terms of possible damage to the material. A second model, specific to a hygroscopic material contuning non saturated capillary pore, was also established. The model was applied to the clay-cellulose fibers composite material (CA). The mechanical damage to the material, conditioned by internal pressure due to the gas phase, was evaluated during the drying process. The conclusions of this research can be exploited in on industrial context in order to reduce energy costs of drying and improve final product quality
Bakkari, Aouatif. "Observation et modélisation d'ouvrages en terre soumis à des processus de séchage et d'umidification". Phd thesis, Ecole des Ponts ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00004699.
Pełny tekst źródłaMakki, Lamis. "Comportement de retrait-gonflement des sols en période de sécheresse". Paris 6, 2009. http://www.theses.fr/2009PA066657.
Pełny tekst źródłaCheng, Wenqing. "Numerical simulation of shrinkage and cracks in clayey soils on drying paths". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0210.
Pełny tekst źródłaClay soil is widely distributed on the Earth’s surface, and because it is cheap and readily available, clay soil has been widely used as a building material for a very long history. Furthermore, clay can be used as not only a natural barrier in the dam cores, but also a matrix for the storage of radioactive wastes because of its retention properties. The mechanical behavior of clay materials is complex, one of the difficulties is that it is sensitive to water. During the desiccation process, clay soils undergo shrinkage, which can cause cracking. The aim of this thesis is, initially, to develop a numerical approach capable of reproducing the phenomenon of shrinkage, the distribution of water content as well as that of suction. In a second step, based on Coussy's theory for unsaturated porous media, and the mechanics of unsaturated soils, a constitutive law will be proposed to describe the behavior observed during desiccation. Finally, to reproduce the cracks distribution, based on the extended finite element method (X-FEM). The realization of numerical simulation is based on the analysis of the desiccation experiments of clay soils in laboratory. The application of the digital image correlation (DIC) technology in the desiccation experiments makes the study on the desiccation process in clay soils more accurate. The experimental results show that the clay soils will generate the theoretical shrinkage deformation caused by its own water loss in the drying path. This deformation in simulation can be related to the water content of clays through the Fredlund function. The desiccation shrinkage of clay soils has an anisotropic phenomenon. The coefficient of shrinkage ratio is used to describe this phenomenon in simulation. One of the ways to construct the constitutive of the initially saturated soft clays during drying could be in using two independent stress tensors which will enable the decomposition of total strain tensor into strain tensor due to drying shrinkage (induced part due to suction variation) and a “mechanical” strain tensor due to the total stress variation. Mechanical strain tensor can be related to total stress by using stiffness matrix. In fact, the initially saturated clay soil resistance increases during desiccation. The result of cracking in the soil under controlled suction is the result of competitions between increased soil resistance and damage caused by shrinkage during desiccation. The soil moisture crack initiation criterion will be based on soil damage and resistance. The criterion of crack propagation, meanwhile, will be based on the theory of conservation of energy. To reproduce the cracks distribution, based on X-FEM. Weibull's law will be used to consider the heterogeneous distribution of the soil. After digital model validation, applications in the geotechnical field are then considered
Yang, Zhengtian. "Étude expérimentale de la fissuration hydrique d’un sol argileux". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0038.
Pełny tekst źródłaThe main objective of this experimental study is to better understand and characterize the shrinkage phenomenon and the cracking behavior of clay during drying, and to better understand the mechanism of crack initiation and propagation in clay under hydric loading. Kaolin K13, which is a pure kaolinite clay, was considered in our study. The research is devoted to two main parts, one related to drying shrinkage and the other to desiccation cracking.Experimental studies on drying shrinkage are conducted to determine the hydraulic properties and mechanical behavior of the studied material during the drying process. For this purpose, the hydric parameters including water content, void index and degree of saturation of small unsaturated clay samples with different suction levels were measured by the Kerdane tests. The test is based on measuring the solid volume by liquid displacement. The shrinkage curve and the water retention curve of the studied material were established after fitting the Fredlund and Van Genuchten formulas from the experimental results. The shrinkage deformation of the soil was studied by controlled desiccation tests using smooth supports. Controlled desiccation, using the salt solution method, allows samples to be subjected to the same desiccation path. Global and local deformations of are obtained by 2D-DIC and 3D-DIC. Finally, the local water content and the local suction of the sample are estimated from the local volume deformation coupled with the water retention curve and the shrinkage curve of our material.The second part of the study is devoted to the initiation and propagation of cracks under controlled desiccation of an initially saturated clay. In order to study the main factors influencing cracking and to compare with free shrinkage, the semi-rough substrate was used in controlled desiccation tests, so that the cracks produced in the different samples were captured by the DIC. The evolution of the cracks was first quantified by morphological and statistical studies of the cracks via Image-J software. The influence of the drying path and sample support on the water cracking behavior were also studied at the global sample scale by the DIC. The increase in mechanical strain within the sample, produced by the limiting effect of the support on shrinkage deformation, is one of the main causes of cracking. The distribution of local strains, the phenomenon of stress concentration (through the development of local strains), are studied and analyzed. Crack initiation occurs in local stress zones where the tensile limit of the soil is exceeded. The crack propagation behavior is due to the tensile stress zone at the crack tip. The cracking mechanism is defined by studying the principal direction of deformation. The observed cracks developed in the horizontal direction of the samples, with little effect of vertical deformation on their occurrence. The mode of failure is mainly mode I. More complex failure modes, mixed with mode I, also exist. The study of the cracking mechanism, especially the cracks caused by traction (mode I) was further investigated by indirect traction tests on clay beams. Beams with different levels of suction were subjected to three-point bending, which caused tensile cracks in their tensioned lower part. The maximum strength and maximum bending at cracking and the local tensile deformation related to cracking are studied, as well as the effect of suction on the strength of unsaturated clays
Roubeuf, Véronique. "Interactions entre fluides et sédiments argileux naturels : étude expérimentale dans des conditions simulant un stockage souterrain de déchets radioactifs". Nancy 1, 2000. http://docnum.univ-lorraine.fr/public/SCD_T_2000_0190_ROUBEUF.pdf.
Pełny tekst źródłaVo, Thi Dong. "Modélisation numérique et analytique de la fissuration de séchage des sols argileux". Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1214/document.
Pełny tekst źródłaThis work focuses on the analysis of desiccation cracking by numerical and analytical approaches. The initiation and the propagation of cracks are investigated by using a finite element code including cohesive joints elements. Coupling between the hydraulic and the mechanical processes in the presence of discontinuities is considered. The cohesive crack’s law is applied to simulate the initiation and the propagation of cracks.Results of a laboratory experiments performed on slurry clay soil are first used to evaluate the proposed numerical modelling method. The results show that the method is able to reproduce the main trends of desiccation process. The importance of boundary conditions are also discussed. Second, an energy approach is proposed to study the initiation of cracks. The energies before and after crack initiation are estimated by both numerical and analytical solutions. The energy released by cracking is then compared to the crack energy to discuss crack initiation conditions. The analysis shows that the energy criterion is reached before the stress criterion, and this can explain unstable crack propagation at the beginning. Third, the development and the geometry of desiccation cracks are studied by numerical simulation with several cohesive joints. The numerical results show that cracking occurs sequentially to form different cracks families with a dichotomy process (the subsequent cracks appear at the middle of two existing neighboring ones). The cracks in each family appear simultaneously and reach an identical ultimate depth. From the numerical results and additional analytical analysis, empirical correlations are proposed to predict the spacing and crack depth. Finally, some preliminary studies are performed showing that the proposed numerical method can be used to predict the desiccation crack phenomena observed on geotechnical earth structures
Alshihabi, Omran. "Étude en laboratoire du comportement d'un sol compacté non saturé : influence des cycles de séchage-humidification". Lille 1, 2002. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2002/50376-2002-167-168.pdf.
Pełny tekst źródłaKsiążki na temat "Argile – Séchage"
Poterie : Carnet de Créations - Idéal Pour Noter Toutes Vos Réalisations Dans les Moindres détails : Taille, Couleur, Argile, Séchage, Cuisson, Finition, Dessins, Etc: 95 Pages - Format 18 X 25,4 Cm - Agrémenté de 8 Conseils Pratiques Pour les Débutants. Independently Published, 2021.
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