References of "Talandier, Jean"
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See detailPermeability evolution and water transfer in the excavation damaged zone of a ventilated gallery
Pardoen, Benoît ULg; Talandier, Jean; Collin, Frédéric ULg

in International Journal of Rock Mechanics & Mining Sciences (2016), 85

The fluid transfers occurring around underground galleries are of paramount importance when envisaging the long-term sustainability of underground structures for nuclear waste disposal. These transfers ... [more ▼]

The fluid transfers occurring around underground galleries are of paramount importance when envisaging the long-term sustainability of underground structures for nuclear waste disposal. These transfers are mainly conditioned by the behaviour of the surrounding material and by its interaction with the gallery air. The hydro-mechanical behaviour of the excavation damaged zone, which develops around galleries due to the drilling process, is thenceforward critical because it is composed of fractures having a significant irreversible impact on flow characteristics and transfer kinetics. Besides, the material interaction with the gallery air may engender water drainage and desaturation. Thus, a gallery air ventilation experiment, preceded by its excavation, is numerically modelled in an unsaturated argillaceous rock to study its influence on hydraulic transfers. The fractures are numerically represented with shear strain localisation bands by means of a microstructure enriched model including a regularisation method. The impact of fracturing on the transport properties is addressed by associating the intrinsic permeability increase with mechanical deformation which is amplified in the strain localisation discontinuities. Such dependence permits us to reproduce a significant permeability increase of several orders of magnitude in the excavation damaged zone, in agreement with available experimental measurements. After the excavation, the hydraulic transfers are studied through the reproduction of a gallery air ventilation experiment that implies drainage and desaturation of the surrounding rock. These transfers depend on liquid water and water vapour exchanges at gallery wall that are introduced through a non-classical boundary condition. The model prediction successfully captures the drainage and desaturation kinetics of undisturbed and damaged rock. [less ▲]

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See detailCompeting effects of volume change and water uptake on the water retention behaviour of a compacted MX-80 bentonite/sand mixture
Gatabin, Claude; Talandier, Jean; Collin, Frédéric ULg et al

in Applied Clay Science (2016), 121-122

Bentonite-based materials have been studied as potential barriers for the geological disposal of radioactive waste. In this context, the hydro-mechanical behaviour of the engineered barrier is first ... [more ▼]

Bentonite-based materials have been studied as potential barriers for the geological disposal of radioactive waste. In this context, the hydro-mechanical behaviour of the engineered barrier is first characterized by free swelling conditions (as a consequence of the progressive filling of technological gaps) followed by constant volume conditions. This paper presents an experimental study conducted in order to characterize the water retention behaviour of a compacted MX-80 bentonite/sand mixture. The water retention properties upon wetting were investigated under both free swelling and constant volume conditions. In the high suction range, the water content was not influenced by the imposed volume constraints. On the contrary, swelling significantly affected the water retention behaviour at low suctions, and the quantity of water stored was higher under free swelling conditions than it was under prevented swelling. In this case, competing effects between bentonite swelling and water uptake did not lead to an increase of the degree of saturation upon wetting, as it was observed for samples wetted under constant volume conditions. The influence of the very strong hydro-mechanical coupling is further discussed. [less ▲]

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See detailModelling of large-scale in situ ventilation test in clayey rock
Pardoen, Benoît ULg; Collin, Frédéric ULg; Talandier, Jean

Poster (2015, March 23)

see attached file

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See detailOn the modelling of compacted bentonite under in situ conditions
Dieudonné, Anne-Catherine ULg; Talandier, Jean; Charlier, Robert ULg

Conference (2015)

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See detailHydromechanical behaviour of bentonite under in situ conditions
Dieudonné, Anne-Catherine ULg; Talandier, Jean; Collin, Frédéric ULg et al

Conference (2015)

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See detailGas injection test in the Callovo-Oxfordian claystone: data analysis and numerical modelling
De la Vaissière, Rémi; Gerard, Pierre; Radu, Jean-Pol ULg et al

in Geological Society, London, Special Publications Online First (2014)

This paper describes a field-scale experiment on gas transport mechanisms performed at Andra’s Underground Research Laboratory (URL) in a clay rock. The experimental layout consists of two parallel ... [more ▼]

This paper describes a field-scale experiment on gas transport mechanisms performed at Andra’s Underground Research Laboratory (URL) in a clay rock. The experimental layout consists of two parallel boreholes that are equipped with multiple packer completions isolating three intervals each, which have been continuously monitoring the pore pressure evolution of the clay rock. Nitrogen gas was injected in the middle test interval of one of the boreholes at increasing rates. The entire gas test comprised six periods of controlled gas injections, each fol-lowed by a shut-in pressure recovery phase. The experimental data are presented along with their interpretation by means of numerical modelling of two-phase flow of gas and water using different numerical codes and different geometrical approaches that include axisymmetric, half-space and full 3D models. An iterative modelling process was used to show step-by-step how an accu-rate description of each component of the experiment system produced a satisfactory reproduc-tion of the experimental data and an improved understanding of the relevant phenomena. For instance, the initial volume of remaining water in the test interval, and the presence of a damaged zone around the boreholes, was important for the models to obtain good agreement with the field data. [less ▲]

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See detailAn unsaturated hydro-mechanical modelling of two in-situ experiments in Callovo-Oxfordian argillite
Charlier, Robert ULg; Collin, Frédéric ULg; Pardoen, Benoît ULg et al

in Engineering Geology (2013), 165

The unsaturated behaviour of Callovo-Oxfordian argillite is investigated through the modelling of 2 in-situ experiments. The first test studies the influence of ventilation in a gallery on the hydro ... [more ▼]

The unsaturated behaviour of Callovo-Oxfordian argillite is investigated through the modelling of 2 in-situ experiments. The first test studies the influence of ventilation in a gallery on the hydro-mechanical behaviour of the rock mass. The second test consists in a gas injection in the rock mass from an experimental borehole. A hydro-mechanical model is described and used in the modelling of the experiments. A review of the main hydro-mechanical parameters of argillite is presented. The numerical results highlight the need of a flow boundary condition reproducing the fluid transfers between the surroundings and the rock mass. The influence of dissolved gas on the compressibility of the liquid phase is also emphasised. [less ▲]

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See detailCharacterization of gas transport in low-permeability media: two-phase flow analysis of an in-situ experiment
Gerard, Pierre; Radu, Jean-Pol ULg; de la Vaissière, Rémi et al

in POROMECHANICS V: Proceedings of the Fifth Biot Conference on Poromechanics (2013)

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See detailModelling of gas migration in clay formations
Gerard, Pierre; Charlier, Robert ULg; Radu, Jean-Pol ULg et al

Conference (2013)

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See detailModelling of localised gas pathways in long-term gas injection test
Gerard, Pierre; Collin, Frédéric ULg; Harrington, Jon et al

Poster (2013)

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See detailHydro and Hydro-Mechanical Modelling of Ventilation Test in Clayey Rocks
Pardoen, Benoît ULg; Talandier, Jean; Charlier, Robert ULg et al

in Mancuso, Claudio; Jommi, Cristina; D'Onza, Francesca (Eds.) Unsaturated Soils: Research and Applications (2012)

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is ... [more ▼]

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is performed in an experimental gallery that is part of an underground research laboratory. A biphasic flow model for unsaturated soil and an elasto-plastic constitutive law are used for the host formation. The models include exchange condition of fluid mass, anisotropy and the excavation damaged zone around the gallery. Finally, the ventilation test is reproduced and the model is calibrated based on the matching between numerical results and experimental measurements. [less ▲]

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See detailGas Migration through Clay Barriers in the Context of Radioactive Waste Disposal: Numerical Modeling of an InSitu Gas Injection Test
Gerard, Pierre ULg; Radu, Jean-Pol ULg; Talandier, Jean et al

in Pijaudier-Cabot, Gilles; Pereira (Eds.) Geomechanics in CO2 Storage Facilities (2012)

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See detailModélisation numérique d’un essai de ventilation in situ
Pardoen, Benoît ULg; Talandier, Jean; Charlier, Robert ULg et al

in Skoczylas, F.; Davy, C.A.; Agostini, F. (Eds.) et al Propriétés de transfert des géomatériaux, Transfert 2012, Ecole centrale de Lille 20-22 mars 2012 (2012)

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is ... [more ▼]

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is performed in an experimental gallery that is part of an underground research laboratory. A biphasic flow model in unsaturated soil and an elasto-plastic constitutive law are used for the host formation. The models include exchange condition of fluid mass, anisotropy and the excavation damaged zone around the gallery. Finally, the ventilation test is reproduced and the model is calibrated based on the matching between numerical results and experimental measurements. [less ▲]

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See detailHydro and hydro-mechanical modelling of ventilation test in clayey rocks
Pardoen, Benoît ULg; Charlier, Robert ULg; Collin, Frédéric ULg et al

Poster (2011, October 03)

Long-term repository of radioactive waste in deep argillaceous geological media needs a good understanding of the host formation behaviour. Considering the safety function of the formation and the need of ... [more ▼]

Long-term repository of radioactive waste in deep argillaceous geological media needs a good understanding of the host formation behaviour. Considering the safety function of the formation and the need of low permeability, the behaviour of the excavation damaged zone (EDZ) is a major issue. Because drainage may modify the structure and the size of this zone, a ventilation test (SDZ) is realised by the French national radioactive waste management agency (ANDRA) in an experimental gallery of the Meuse/Haute-Marne underground research laboratory located in Callovo-Oxfordian claystone. The aim is to characterise the effect of the desaturation and possible resaturation of the damaged zone due to controlled ventilation. Numerical modellings are performed to reproduce the ventilation test. A biphasic flow model in unsaturated soil and an elasto-plastic constitutive law are used for the host formation. A nonclassical boundary condition has been developed in order to model the exchanges between the cavity and the rock. Numerical results show that it is possible to calibrate the models to obtain a satisfactory reproduction of the in situ experimental measurements and a better understanding of the fluid transfer around the gallery during the ventilation test. [less ▲]

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See detailNumerical modelling of the resaturation of swelling clay with gas injection
Gerard, Pierre ULg; Radu, Jean-Pol ULg; Talandier, Jean et al

in Alonso, Edouardo; Gens, Antonio (Eds.) Unsaturated Soils (2010)

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See detailHM modelling of in-situ gas injection tests in bentonite and argillite: the PGZ experiment
Gerard, Pierre ULg; Charlier, Robert ULg; Radu, Jean-Pol ULg et al

in Clays in Natural and Engineered Barriers for Radioactive Waste Confinement (2010)

Detailed reference viewed: 58 (20 ULg)