Now showing items 1-20 of 88

    • 3D Interpretation of an in situ heating test in the callovo-oxfordian mudstone 

      Garitte, Benoit; Vaunat, Jean; Gens Solé, Antonio; Armand, G. (2010)
      Conference report
      Open Access
      In order to improve the understanding of the thermo-hydro-mechanical (THM) behaviour of the Callovo-Oxfordian Clay, an in situ heating test (TER experiment) has been realized by ANDRA at Meuse/Haute Marne URL during the ...
    • A constitutive model for soft clayey rocks that includes weathering effects 

      Pinyol Puigmartí, Núria Mercè; Vaunat, Jean; Alonso Pérez de Agreda, Eduardo (Institution of Civil Engineers (http://www.ice.org.uk/), 2007)
      Article
      Open Access
      Microstructural and mineralogical observations of claystones reveal the presence of clay aggregates bonded by a skeleton of inert minerals such as calcium carbonate. The behaviour of these natural materials evolves from ...
    • A cross-anisotropic formulation for elasto-plastic models 

      Mánica Malcom, Miguel Ángel; Gens Solé, Antonio; Vaunat, Jean; Ruiz Restrepo, Daniel Felipe (2016-06)
      Article
      Restricted access - publisher's policy
      A cross-anisotropic formulation for elasto-plastic constitutive models based on a non-uniform scaling of the stress tensor is described. Taking advantage of the material symmetries characterising cross-anisotropy, only two ...
    • A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments 

      de la Fuente Ruiz, María; Vaunat, Jean; Marín Moreno, Héctor (2020-04)
      Article
      Open Access
      Recent pore-scale observations and geomechanical investigations suggest the lack of true cohesion in methane hydrate-bearing sediments (MHBSs) and propose that their mechanical behavior is governed by kinematic constrictions ...
    • A framework for the time-dependent behaviour of soft structured clays 

      Mánica Malcom, Miguel Ángel; Ovando-Shelley, Efrain; Jaramillo, Eduardo Botero; Gens Solé, Antonio; Vaunat, Jean (2022)
      Conference report
      Restricted access - publisher's policy
      From the combination of existing modelling approaches, a constitutive framework is presented for the numerical modelling of soft structured clays. The formulation accounts, in a natural way, for time-dependent phenomena ...
    • A full-scale in situ heating test in Callovo-Oxfordian claystone: observations, analysis and interpretation 

      Tourchi, Saeed; Vaunat, Jean; Gens Solé, Antonio; Bumbieler, F.; Vu, Minh-Ngoc; Armand, G. (Elsevier, 2021-05)
      Article
      Open Access
      The paper describes the performance, observations and numerical interpretation of a full-scale in situ heating test conducted on Callovo-Oxfordian (COx) claystone in the Meuse / Haute-Marne (MHM) Underground Research ...
    • A microstructural model on the link between change in pore size distribution and wetting induced deformation in a compacted silt 

      Casini, Francesca; Vaunat, Jean; Romero Morales, Enrique Edgar (American Society of Civil Engineers (ASCE), 2013)
      Conference report
      Restricted access - publisher's policy
      The water retention curve expressed in terms of water content or degree of saturation and suction is hysteretic, stress path dependent (on void ratio), and depends on pore network. To properly describe its evolving nature, ...
    • A procedure for the direct determination of Bishop's chi parameter from changes in pore size distribution 

      Vaunat, Jean; Casini, F. (Thomas Telford, 2017-07)
      Article
      Open Access
      Most of the recent works relating to the concept of effective stress in unsaturated soils focus on the proposal by Bishop, and, more particularly, on the search for suitable relationships between Bishop's ¿ parameter and ...
    • A thermomechanical model for argillaceous hard soils–weak rocks: application to THM simulation of deep excavations in claystone 

      Tourchi, Saeed; Mánica Malcom, Miguel Ángel; Gens Solé, Antonio; Vaunat, Jean; Vu, Minh-Ngoc; Armand, Gilles (2023-11-15)
      Article
      Restricted access - publisher's policy
      The paper presents the enhancement of an existing constitutive model for argillaceous hard soils-weak rocks to incorporate non-isothermal conditions to be used in coupled thermo-hydro-mechanical (THM) simulations of ...
    • A time-dependent anisotropic model for argillaceous rocks: application to an underground excavation in Callovo-Oxfordian claystone 

      Mánica Malcom, Miguel Ángel; Gens Solé, Antonio; Vaunat, Jean; Ruiz Restrepo, Daniel Felipe (2017-05)
      Article
      Open Access
      The paper presents a constitutive model for argillaceous rocks, developed within the framework of elastoplasticity, that includes a number of features that are relevant for a satisfactory description of their hydromechanical ...
    • An effective combined framework for modelling the time-dependent behaviour of soft structured clays 

      Mánica Malcom, Miguel Ánge; Gens Solé, Antonio; Ovando-Shelley, Efrain; Jaramillo, Eduardo Botero; Vaunat, Jean (Springer, 2021-02)
      Article
      Open Access
      A constitutive framework for the simulation of the time-dependent behaviour of soft structured clays has been developed from the combination of a number of existing modelling approaches. The formulation accounts, in a ...
    • An interior - point algorithm for hyper-plastic models for soils 

      Samat, Sergio; Vaunat, Jean; Gens Solé, Antonio (2009)
      Conference report
      Open Access
      In numerical analysis of geotechnical problems it is often necessary to use sophisticated elastoplastic constitutive models. Particularly, the presence of friction as the fundamental mechanism to dissipate energy provides ...
    • Analysis of strain localization with a non-local plasticity model 

      Mánica Malcom, Miguel Ángel; Gens Solé, Antonio; Vaunat, Jean; Ruiz Restrepo, Daniel Felipe (2017)
      Conference report
      Open Access
      Strain localization can be defined as the accumulation of deformations in narrow zones, in the form of shear bands or cracks, commonly observed in several geomaterials like concrete, rocks, dense sands, or stiff fine-grained ...
    • Analysis of strain localization with a nonlocal plasticity model 

      Mánica, Miguel A.; Gens Solé, Antonio; Vaunat, Jean; Ruiz, Daniel F. (CIMNE, 2017)
      Conference report
      Open Access
      In the present paper a nonlocal plasticity model is described, intended to reproduce the mechanical behaviour of stiff fine-grained soils, including the objective simulation of strain localization; the phenomenon of accumulation ...
    • Analysis of the excavation of a deep drift in a tertiary clay 

      Vaunat, Jean; Gens Solé, Antonio; de Vasconcelos, R.; Li, X.-L. (International Centre for Computational Engineering, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper tackles the issues related to the excavation of a horizontal gallery carried out in Boom clay, a tertiary clay that hosts the Underground Laboratory of the Belgium Nuclear Agency (SCK-CEN). The gallery is 85 m ...
    • Analysis of the hydration of an unsaturated seal 

      Ruiz Restrepo, Daniel Felipe; Vaunat, Jean; Gens Solé, Antonio; Mánica Malcom, Miguel Ángel (American Society of Civil Engineers (ASCE), 2018)
      Conference report
      Restricted access - publisher's policy
      The paper contains a coupled numerical analysis of the hydration of a potential sealing system for isolating shafts, ramps, and connecting galleries in a deep geological repository for high level nuclear waste. The modeling ...
    • Análisis de la estabilidad de laderas mediante Macro-Elementos 

      Sánchez Fornia, Jatnna Alexandra; Vaunat, Jean (International Centre for Numerical Methods in Engineering (CIMNE), 2022)
      Conference report
      Open Access
      La modelación numérica de la respuesta de laderas naturales bajo acciones climáticas a escala regional requiere una capacidad de cálculo actualmente fuera de alcance. Una alternativa consiste en usar modelos reducidos, ...
    • Anisotropic failure criterion for an argillaceous rock: formulation and application to an underground excavation case 

      Mánica, Miguel A.; Gens Solé, Antonio; Vaunat, Jean; Ruiz, Daniel F. (CIMNE, 2015)
      Conference lecture
      Open Access
    • Anisotropy effects in a deep excavation in stiff clay 

      Vaunat, Jean; Gens Solé, Antonio; Barboza de Vasconcelos, Ramón (2013)
      Conference report
      Open Access
      This paper tackles the issues related to the excavation of a horizontal gallery carried out in Boom clay, a tertiary clay that hosts the Underground Laboratory of the Belgium Nuclear Agency (SCK-CEN). The gallery is 85 m ...
    • Anisotropy effects in a deep excavation in stiff clay 

      Vaunat, Jean; Gens Solé, Antonio; De Vasconcelos, Ramón (CIMNE, 2013)
      Conference report
      Open Access
      This paper tackles the issues related to the excavation of a horizontal gallery carried out in Boom clay, a tertiary clay that hosts the Underground Laboratory of the Belgium Nuclear Agency (SCK-CEN). The gallery is 85 m ...