WorldCat Identities

Tang, Anh Minh

Overview
Works: 24 works in 38 publications in 2 languages and 410 library holdings
Genres: Conference papers and proceedings 
Roles: Editor, Opponent, Thesis advisor, Author, Other, htt
Publication Timeline
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Most widely held works by Anh Minh Tang
Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering : Energy and Geotechnics by M. F Randolph( )

11 editions published between 2018 and 2019 in English and held by 209 WorldCat member libraries worldwide

These proceedings gather a selection of refereed papers presented at the 1st Vietnam Symposium on Advances in Offshore Engineering (VSOE 2018), held on 1-3 November 2018 in Hanoi, Vietnam. The contributions from researchers, practitioners, policymakers, and entrepreneurs address technological and policy changes intended to promote renewable energies, and to generate business opportunities in oil and gas and offshore renewable energy. With a special focus on energy and geotechnics, the book brings together the latest lessons learned in offshore engineering, technological innovations, cost-effective and safer foundations and structural solutions, environmental protection, hazards, vulnerability, and risk management. The book offers a valuable resource for all graduate students, researchers and industrial practitioners working in the fields of offshore engineering and renewable energies
CIGOS 2019, Innovation for Sustainable Infrastructure : Proceedings of the 5th International Conference on Geotechnics, Civil Engineering Works and Structures by Civil Engineering Works and Structures International Conference on Geotechnics( )

4 editions published between 2019 and 2020 in English and held by 171 WorldCat member libraries worldwide

This book presents selected articles from the 5th International Conference on Geotechnics, Civil Engineering Works and Structures, held in Ha Noi, focusing on the theme "Innovation for Sustainable Infrastructure", aiming to not only raise awareness of the vital importance of sustainability in infrastructure development but to also highlight the essential roles of innovation and technology in planning and building sustainable infrastructure. It provides an international platform for researchers, practitioners, policymakers and entrepreneurs to present their recent advances and to exchange knowledge and experience on various topics related to the theme of "Innovation for Sustainable Infrastructure"
Thermal and thermo-mechanical behavior of energy piles by Van-Tri Nguyen( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

The thermal and thermo-mechanical behavior of energy piles is investigated by various approaches: laboratory measurement on small soil samples, physical modeling on small-scale pile, experiments on real-scale pile, and analytical/numerical calculations. First, the thermal conductivity of unsaturated loess is measured simultaneously with moisture content and suction. The results show a unique relationship between thermal conductivity and moisture content during a wetting/drying cycle while a clear hysteresis loop can be observed on the relationship between thermal conductivity and suction. Second, thermal tests are performed on a full-scale experimental energy pile to observe heat transfer at the real scale. Third, an analytical solution is proposed to simulate conductive heat transfer from an energy pile to the surrounding soil during heating. The above-mentioned tasks related to the thermal behavior are then completed by studies on the thermo-mechanical behavior of energy piles. On one hand, experiments are performed on a small-scale pile installed either in dry sand or in saturated clay. Thirty thermal cycles, representing thirty annual cycles, are applied to the pile under various constant pile head loads. The results show irreversible pile head settlement with thermal cycles; the settlement is higher at higher pile head load. In addition, the irreversible thermal settlement is the most significant during the first cycles; it becomes negligible at high number of cycles. On the other hand, the experimental work with small-scale pile is completed with numerical calculations by using the finite element method. This approach is first validated with the results on small-scale pile prior to be used to predict the results of full-scale experiments
Comportement thermo-hydro-mécanique et microstructure de l'argilite du Callovo-Oxfordien by Hamza Menaceur( )

1 edition published in 2014 in French and held by 2 WorldCat member libraries worldwide

The development of nuclear energy in recent years requires safe solutions for the storage of radioactive waste. A solution proposed for high activity radioactive waste is the storage indeep low permeability geological formations such as claystones. In this perspective, Andra, the French agency for the management of radioactive wastes, supported investigations on theshort and long term behaviour of the Callovo-Oxfordian (COx) claystone, considered as apotential host rock in France. In this framework, a microscopic and macroscopic experimental study on the thermo-hydro-mechanical behaviour of COx claystone was carried out. In this work, a microstructure investigation of the water retention properties of the Cox claystone was performed. The water retention properties were determined by controlling suction through the vapour phase, with also the monitoring of volume changes and changes indegree of saturation as a function of suction along the drying and wetting paths. The study was completed by a microstructure investigation based on the use of mercury intrusion porosimetry on freeze-dried specimens. It was observed that the concepts governing the hydration of smectites appeared useful to better understand the effects of changes in water content and suction on the microstructure of COx claystone. In a second step, the compression-swelling behaviour of the COx claystone was related to micro structure features by performing high pressure oedometer compression tests and byrunning mercury intrusion porosimetry tests and scanning electron microscope observationson specimens submitted to compression and stress release. The results obtained showed that the potential of swelling was linked to the density of cracks generated during compression. The thermo-mechanical behaviour of fully saturated COx claystone specimens was investigated from shear and drained heating tests using a hollow cylinder triaxial device specially developed for low permeability materials. The shear tests at 25°C evidenced lowershear strength on specimens with higher porosity. The preliminary results obtained at 80°Cevidenced a more ductile response, with slightly smaller shear strength and little changes of the elastic parameters at elevated temperature. Drained isotropic heating tests confirmed thecontracting volumetric plastic behaviour of the COx argillite, similar to normally consolidated clays. The effect of thermal pressurisation of the pore water on a specimen with a pre-existingshear plan was investigated. The results showed that undrained heating under shear stress decreased the effective stress, bringing back the sheared specimen to failure. The self-sealing properties of COx claystone at 25 and 80°C were investigated by conducting steady state permeability tests on sheared specimens at various stages. The results showed that the overall permeability of the sheared specimen at 25 and 80°C was comparable to that before shearing, confirming the good self-sealing properties of COx claystone
Aspects géotechniques des pieux de fondation énergétiques by Neda Yavari( )

1 edition published in 2014 in French and held by 2 WorldCat member libraries worldwide

L'efficacité de pieux géothermiques (e.g. énergétiques) a été examinée et validée par de nombreuses études à partir de points de vue environnemental et énergétique jusqu'à présent. Néanmoins, la technologie des pieux géothermiques est encore peu connue et rarement appliquée dans la construction, notamment en France comparée à d'autres pays européens. La raison principale du manque d'attention peut être la connaissance limitée sur les impacts du chargement thermomécanique sur le comportement du pieu et celui du sol environnant. Cette thèse vise à étudier les aspects géotechniques des pieux géothermiques grâce aux modélisations physiques et numériques. Un modèle physique est développé afin de mieux connaitre l'interaction sol/pieu sous chargement thermomécanique. Le modèle est composé d'un pieu énergétique équipé des tubes d'échangeur de chaleur, installé dans un sol compacté. Le pieu a d'abord été installé dans un sable sec, puis dans une argile saturée ; il a ensuite été chargé mécaniquement et soumis à des cycles thermiques. L'effet de la charge mécanique, du nombre de cycles thermiques et du type de sol a été étudié. Les résultats montrent la génération de tassements irréversibles au cours des cycles thermiques, dont la quantité augmente avec l'augmentation de la charge en têtes du pieu. La pression totale dans le sol à proximité de la surface du pieu ne change pas par refroidissement et chauffage, tandis que la pression totale au-dessous du pieu augmente progressivement à mesure que les cycles thermiques poursuivent. Les expériences montrent aussi l'évolution des profils de la force axiale avec la température ; la force axiale dans le pieu augmente pendant le refroidissement et diminue pendant l'échauffement. Les comportements au cisaillement du sol (mêmes sols que ceux utilisés dans la première partie) ainsi que de l'interface sol/béton ont été évalués à différentes températures. Pour ce faire, un appareil de cisaillement conventionnel a été équipé d'un système de contrôle de température. Le sol (et l'interface sol/béton) a été soumis à une gamme de contraintes relativement faibles. La consolidation thermique a été effectuée selon un protocole particulier. Il a été observé que l'angle de frottement et la cohésion de matériaux utilisés ne changent pas sensiblement avec température. L'étude numérique a débuté par la simulation d'essais existants dans la littérature sur des pieux énergétiques en appliquant une méthode simplifiée via un code de calcul basé sur la méthode des éléments finis et assez répandu dans la profession. Le changement de la température est simulé en imposant au pieu des déformations volumétriques calculées à partir du coefficient de dilatation thermique du matériau. La méthode prédit correctement le comportement de certains pieux énergétiques à grande échelle en termes de contrainte axiale et de déplacement en tête du pieu. Les résultats mettent en évidence le rôle important joué par le changement de volume du pieu induit par les variations thermiques sur son comportement mécanique. Dans un second temps, un autre code de calcul offrant la possibilité d'inclure les effets thermique a été utilisé pour la modélisation des essais effectués auparavant sur le modèle physique. Ainsi, en comparant aux modélisations numériques précédemment expliquées, le changement de volume du sol induit par les variations de température est également pris en compte. Les résultats numériques et expérimentaux sont ainsi comparés. On en déduit que le modèle numérique est capable de prédire le comportement des pieux sous chargement purement mécanique. En outre, en simulant des essais thermomécaniques, une bonne estimation du transfert thermique dans le sol est obtenue. En ce qui concerne le comportement mécanique du pieu au cours de cycles thermiques, le modèle numérique prédit bien le tassement progressif du pieu. Cependant, en termes de répartition de la force axiale, on obtient des résultats contradictoires
Experimental investigation on the grain-scale compression behavior of loose wet granular material by Vinh-Du Than( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Modélisation numérique et analytique de la fissuration de séchage des sols argileux by Thi Dong Vo( )

1 edition published in 2017 in French and held by 2 WorldCat member libraries worldwide

This 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
Effet de la température sur le comportement des barrières de confinement by Anh-Minh Tang( Book )

2 editions published in 2005 in French and held by 2 WorldCat member libraries worldwide

Étude des propriétés thermo-hydro-mécaniques des sols fins traités à la chaux by Yejiao Wang( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Lime treatment is a technique which greatly improves the workability and the mechanical behaviour of problematic soils. However, the sustainability of this treatment in the earthworks for the long term is an important issue for their stability. Besides, the aggregate size resulting from the construction procedure is an essential parameter that may influence the behaviour of treated soils in field construction. The present work deals with the thermo-hydro-mechanical properties of lime-treated soils, with an emphasis put on the curing time and the aggregate size effects. Lime-treated soil samples (both silt and clay) were prepared with different sizes of aggregates and cured during different periods. Afterwards, these soils were studied through microstructural observations, mineralogical analyses, thermal conductivity, air permeability and water retention capacity measurements, as well as the determinations of compressibility and small strain shear modulus. The results show that significant changes of thermo-hydro-mechanical behaviour of soils are induced by lime treatment after curing. Moreover, the aggregate size also plays an essential role in the behaviour of treated soils. Samples prepared with the large aggregates present higher thermal conductivity and air permeability, but with lower water retention capacity, poorer compression behaviour and smaller stiffness
Long-term thermo-mechanical behavior of energy pile in dry sand by Van Tri Nguyen( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

A New Isotropic Cell for Studying the Thermo-Mechanical Behavior of Unsaturated Expansive Clays by Anh-Minh Tang( )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

This paper presents a new suction-temperature controlled isotropic cell that can be used to study the thermo-mechanical behavior of unsaturated expansive clays. The vapor equilibrium technique is used to control the soil suction; the temperature of the cell is controlled using a thermostat bath. The isotropic pressure is applied using a volume/pressure controller that is also used to monitor the volume change of soil specimen. Preliminary experimental results showed good performance of the cell
Infiltration Column for Studying the Lateral Swell Behavior of Expansive Clay by Simona Saba( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Infiltration column is usually used to investigate the hydro-mechanical processes in unsaturated expansive clay. In this test, the moisture transfer is often monitored along the column during water infiltration using suction or water content probes. Nevertheless, the lateral swelling pressure developed is rarely considered. This paper describes an infiltration column for studying the lateral swell behavior of expansive clay. The column consists of a rigid cell ensuring the constant-volume condition and a hydraulic system enabling the water intake of the hosted sample. It is equipped with three types of sensors: pressure sensors, force transducers, and displacement transducers to, respectively, monitor the radial and axial swelling pressure of the sample at different positions and to check whether any axial displacement is taking place. A detailed description of the different parts of the cell is first presented. Second, analysis on the results of a test on a compacted bentonite/sand mixture allows the pertinence of such a device to be evaluated
Etudes des propriétés hydromécaniques des sols argileux non saturés proches de la saturation by Zhong-Sen Li( )

1 edition published in 2015 in French and held by 1 WorldCat member library worldwide

Cette thèse présente un ensemble de résultats expérimentaux sur une argile remaniée non saturée proche de la saturation, dont le degré de saturation est généralement supérieur à 70%.Après une série d'essais de caractérisation physique et mécanique du matériau, plusieurs méthodes expérimentales ont été utilisées pour étudier le comportement et certaines pathologies du sol compacté telles que l'orniérage et le matelassage.Une étude systématique du comportement du sol compacté sur chemins de drainage-humidification dans différents états initiaux a été effectuée, complétée par des mesures de succion par papier filtre et psychromètre. Les essais de porosimétrie par intrusion de mercure ont apporté un éclairage sur la microstructure du sol.La thèse a également permis d'étudier les variations de pression interstitielle du sol compacté sur chemin triaxial non drainé en utilisant la technique de translation d'axes, où quelques améliorations et modifications du montage ont été proposées
Experimental study on the mechanical properties and the microstructure of methane hydrate-bearing sandy sediments by Thi Xiu Le( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

Les hydrates de méthane (MHs), composés de gaz de méthane et d'eau, se forment naturellement à haute pression et faible température dans les sédiments marins ou pergélisols. Ils sont actuellement considérés comme une ressource énergétique (principalement MHs dans les sédiments sableux) mais aussi une source de géo-hasards et du changement climatique (MHs dans les sédiments grossiers et fins). La connaissance de leurs propriétés mécaniques/physiques, qui changent considérablement avec la morphologie et distribution des hydrates dans les pores, est très importante pour minimiser les impacts environnementaux liés aux futures exploitations du gaz de méthane à partir des sédiments sableux contenant des MHs (MHBS). La plupart des études expérimentales concernent MHBS synthétiques à cause des difficultés pour récupérer des échantillons intacts. Différentes méthodes ont été proposées pour former MHs dans les sédiments au laboratoire pour reconstituer des sédiments naturels, mais sans grand succès. Cette thèse a pour objectif d'évaluer la morphologie, la distribution des MHs dans les MHBS synthétiques à différentes échelles et d'étudier les effets des MHs (leur morphologie et teneur en hydrate) sur les propriétés mécaniques des MHBS. Deux méthodes de formation d'hydrates dans les sédiments sableux ont été proposées. Au niveau macroscopique, la distribution des hydrates au niveau des pores est évaluée en se basant sur la vitesse de propagation d'onde de compression (mesurée et calculée à partir des modèles existants). Des essais triaxiaux ont été utilisés pour étudier l'influence des MHs à différentes teneurs en hydrate sur les propriétés mécaniques des MHBS. Par ailleurs, l'Imagerie par Résonance Magnétique a été utilisée pour étudier la cinétique de formation/dissociation d'hydrates et aussi la distribution des hydrates sur l'ensemble de l'échantillon. Les résultats montrent qu'un cycle de température en conditions non drainées complète la redistribution des hydrates dans les pores après la saturation en eau de l'échantillon à haute teneur en hydrate. La distribution des hydrates sur l'ensemble de l'échantillon devient plus homogène avec la saturation en eau suivie par un cycle de température. En outre, les propriétés mécaniques des sédiments augmentent avec l'augmentation de la teneur en hydrate.A l'échelle du grain, la tomographie aux rayons X (XRCT) et celle au Synchrotron XRCT (SXRCT, Synchrotron SOLEIL) ont été utilisées pour observer la morphologie et la distribution des MHs au niveau des pores des sédiments sableux. Ce travail n'a pas été facile car il nécessitait des dispositifs expérimentaux compliqués (pour maintenir la haute pression et faible température) mais aussi en raison du faible contraste entre MHs et l'eau sur les images de XRCT, SXRCT. Des dispositifs spécifiques ont été développés pour étudier la formation d'hydrates, la morphologie et la distribution à l'échelle du grain des MHs en utilisant XRCT, SXRCT. De plus, une nouvelle méthode a été développée pour déterminer plus précisément les fractions volumiques d'un milieu triphasé à partir des images XRCT. Des observations au Microscope Optique (en coopération avec l'Université de Pau) ont également été faites pour confirmer diverses morphologies de MHs dans les sédiments sableux. Les morphologies et distributions d'hydrates observées sont comparées avec les modèles existants. Les observations montrent que la formation des MHs dans les sédiments sableux est un processus instable et compliqué. Différentes morphologies et distributions au niveau des pores des MHs peuvent coexister. Il parait indispensable de tenir compte des vraies morphologies et distributions au niveau des pores des MHs pour les études numériques utilisant des modèles simplifiés.Mots-clés: hydrate de méthane, sédiments sableux, formation, dissociation, morphologies, distribution, propriétés mécaniques, XRCT, SXRCT, microscope optique, essais triaxiaux, modèle de mécanique des roches
Thermo-hydro-mechanical behavior of an embankment to store thermal energy by Mojdeh Lahoori( )

1 edition published in 2020 in English and held by 1 WorldCat member library worldwide

Nowadays, thermal energy storage in geostructures like embankments can be possible by installing the horizontal heat exchangers in different layers of compacted soil. In this system, the thermal energy is stored in summer via a fluid, circulating in the heat exchangers, to be extracted in the demand period. When the serviceability of embankment as a medium to store the thermal energy starts, the compacted soil will be subjected to the daily and seasonally temperature variations. These seasonal temperature variations could modify the thermo-hydro-mechanical performance of the compacted soil. Thus, the aim of this study is to investigate the thermal and mechanical performances of a compacted soil when it is subjected to monotonic and cyclic temperature variations. The studied soil is a sandy lean clay that is frequently used in embankment constructions in France. The thermal and mechanical behavior of the soil are investigated at a compaction state corresponding to the optimal thermal properties. However, this compacted soil is unsaturated and the estimation of its thermal properties is complex. In this study, an inverse analytical model is proposed to estimate the thermal properties of the soil using temperature monitoring in the range of 20 to 50 °C in a soil compacted in a large container. The estimated thermal parameters were compared to classical laboratory measurements (transient and steady-state methods). The comparison showed that the estimated values were close to the results obtained in transient laboratory method. Using this method, the thermal efficiency of the compacted soil can be verified in the lifetime of the storage system. To ensure the structure stability, long-term mechanical response of these systems subjected to monotonic and cyclic temperature variations should be investigated. To achieve this aim, using temperature-controlled oedometric and direct shear devices, consolidation and shear parameters of the studied soil at different monotonic (5, 20, and 50 °C) and cyclic (5 to 50 °C) temperatures were investigated. The results of temperature-controlled oedometric tests showed that the effect of the temperature variation is more pronounced under vertical pressures higher than the preconsolidation pressure. The compression and swelling indexes could be considered independent of temperature variations. Therefore, the overall settlement of the embankment due to thermal variation near the heat exchangers could be considered negligible. The results of temperature-controlled direct shear tests showed that the temperature variations (monotonic heating or cooling, or temperature cycles) increased the cohesion which is beneficial for the bearing capacity and slope stability of embankments. These results can be directly used in the design of embankments to store thermal energy exposed to similar thermo-mechanical paths. Finally, the thermal performance of the compacted soil is verified using a numerical simulation considering the soil atmosphere interaction. Different depths installation of heat exchanger loops and different heat storage scenarios were simulated. The results showed that the compacted soil increases 8.5% the systems performance compared to the horizontal loop installation in the local soil. The results of two different scenarios show that an inlet fluid temperature of 50 °C in summer increases highly the system performance (13.7% to 41.4%) while the improvement is less significant (0% to 4.8%) for the ambient inlet temperature. Moreover, a deeper installation of horizontal loops increases the system performance. From the numerical simulation results can be concealed that the embankment is in interaction with the atmosphere from its upper and lateral surfaces, the thermal efficiency of the structure could be affected due to heat losses. Therefore, it is preferable to place the heat exchangers away from the top and side surfaces
Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays by Anh-Minh Tang( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

A large-scale infiltration tank was developed to study the water transfer in compacted expansive clay. Volumetric water content sensors were buried in a soil column for water content monitoring during infiltration. In addition to water content, soil suction and temperature at various locations and the heave at the soil surface were also monitored. Emphasis was put in minimizing the effect of sensors installation on water transfer and soil deformation. The results obtained for 338 days of infiltration were presented in terms of changes in suction, volumetric water content, temperature, and the soil heave. Based on the recorded data, the performance and limitation of different suction and volumetric water content sensors and the adopted test procedure were analyzed. The recorded data on soil suction and volumetric water content were finally analyzed for determining the unsaturated hydraulic properties of soil, such as the water retention curve and the unsaturated hydraulic conductivity. Note also that the results constitute useful data for further physical analysis or numerical models' calibration
3rd European conference on unsaturated soils : (E-UNSAT 2016) by Pierre Delage( Book )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Experimental and numerical study of the hydromechanical behaviour of bentonite pellet-powder mixtures by Benjamin Dardé( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Bentonite based materials are considered as a sealing material in radioactive waste disposal concepts because of their low permeability, radionuclide retention capacity and ability to swell upon hydration, thus filling technological gaps. Within this context, bentonite pellet mixtures have been studied owing to operational convenience. Pellets are laid in the galleries in a dry state as a granular assembly. The mixture progressively becomes more homogeneous upon hydration by the pore water of the host rock. Before homogenisation, the granular structure of the material controls the macroscopic behaviour of the mixture.The present work focuses on the experimental characterisation and numerical modelling of a mixture of bentonite pellet and crushed pellet (powder), in proportion 70/30 in dry mass, a candidate sealing material in the French concept of radioactive waste disposal. The proposition, implementation and validation of a new modelling framework, considering features such as the initial granular structure of the material or local heterogeneities of densities, is the main objective of this PhD work.The influence of the initial granular structure is evidenced by performing suction-controlled swelling pressure tests in the laboratory, using samples of various powder contents. From grain-level experimental characterisation, a simple model describing the hydromechanical behaviour of a pellet is proposed and implemented in a Discrete Element Method (DEM) code. Using DEM and the proposed model, aforementioned swelling pressure tests performed on samples containing no powder are satisfactorily simulated. The same method is used to model large granular assemblies of various pellet densities upon hydromechanical loadings. Relevant parameters involved in the macroscopic behaviour of pellet mixtures in “granular” state are identified from simulation results and constitutive laws are proposed to describe the hydromechanical behaviour of these materials using a continuum mechanics approach.The transition from “granular” state to “homogenised” state is described by criteria proposed from experimental results and data available in the literature and involves suction and relative volume fractions of pellet and powder. A modified version of the Barcelona Basic Model is proposed to model the material behaviour in “homogenised” state. The proposed model is implemented in the Finite Element Method (FEM) code BIL. Using a single set of parameters, all swelling pressure tests performed in the laboratory are satisfactorily reproduced in FEM simulations along the entire hydration path.The material behaviour upon hydration in constant volume condition is finally studied at a larger scale by performing mock-up imbibition tests, using various powder contents. Cells have a square section; a glass side and a camera allow the texture to be observed during hydration. The dominance of vapour transfers in the saturation process of the material, the influence and evolution of the granular structure upon hydration, and the influence of the powder content on the macroscopic response are notably identified. Transfer laws are proposed to describe the observed material behaviour in the mock-up tests and implemented in BIL.The realisation of larger scale coupled simulations using the proposed hydromechanical model is a perspective arising from this PhD work. Predictive simulations could be performed at the structure scale, considering relevant features such as the initial granular structure and local heterogeneities of density in the sealing plugs
Comportement hydromécanique des sols fins compactés au voisinage de la saturation. : application aux remblais routiers by Soanarivo Rinah Andrianatrehina( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

The thesis presents an experimental study on very high plasticity soils compacted near of the standard Proctor optimum (SPO). It is performed as part of the ANR TerreDurable project which is devoted on the design of earthworks with fine soils. After the study of the effect of compaction on drying-wetting paths, induced cracking of drying is highlighted and analyzed. Furthermore, relationships between different mechanical parameters (modulus, IPI, compressive strength) and water (suction, permeability) according to the energy of compaction and method of preparation are shown. The mechanical behavior of soils compacted fine soils is studied on saturated and unsaturated, drained and undrained oedometer and triaxial. For the unsaturated undrained triaxial, the change in Skempton parameters pore pressure is analyzed on isotropic and deviatoric paths. This required the development of a triaxial cell equipped with psychrometers, tensiometer and strain gauges
Monitoring Field Soil Suction Using a Miniature Tensiometer by Y. J Cui( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

An experimental device was developed to monitor the field soil suction using a miniature tensiometer. This device consists of a double tube system that ensures a good contact between the tensiometer and the soil surface at the bottom of the testing borehole. This system also ensures the periodical retrieving of the tensiometer without disturbing the surrounding soil. This device was used to monitor the soil suction at the site of Boissy-le-Châtel, France. The measurement was performed at two depths (25 and 45 cm) during two months (May and June 2004). The recorded suction data are analyzed by comparing with the volumetric water content data recorded using TDR (Time Domain Reflectometer) probes as well as the meteorological data. A good agreement between these results was observed, showing a satisfactory performance of the developed device
 
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