Browsing by Author "Vaunat, Jean"
Now showing items 1-20 of 97
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3D Interpretation of an in situ heating test in the callovo-oxfordian mudstone
(2010)
Conference report
Open AccessIn 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 comparative analysis of different approaches to large-scale modeling for a radioactive waste repository in the Callovo-Oxfordian claystone and sensitivity analysis
(2025-02)
Article
Restricted access - publisher's policyThis paper aims to present a comparison of several approaches to numerically modeling for a study case of an intermediate-level long-lived radioactive (IL-LLW) repository of the French geological nuclear waste disposal ... -
A constitutive model for soft clayey rocks that includes weathering effects
(Institution of Civil Engineers (http://www.ice.org.uk/), 2007)
Article
Open AccessMicrostructural 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
(2016-06)
Article
Restricted access - publisher's policyA 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
(2020-04)
Article
Open AccessRecent 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
(2022)
Conference report
Restricted access - publisher's policyFrom 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
(Elsevier, 2021-05)
Article
Open AccessThe 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
(American Society of Civil Engineers (ASCE), 2013)
Conference report
Restricted access - publisher's policyThe 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
(Thomas Telford, 2017-07)
Article
Open AccessMost 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
(2023-11-15)
Article
Open AccessThe 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
(2017-05)
Article
Open AccessThe 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
(Springer, 2021-02)
Article
Open AccessA 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
(2009)
Conference report
Open AccessIn 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
(2017)
Conference report
Open AccessStrain 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
(CIMNE, 2017)
Conference report
Open AccessIn 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
(International Centre for Computational Engineering, 2011)
Conference report
Restricted access - publisher's policyThis 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
(American Society of Civil Engineers (ASCE), 2018)
Conference report
Restricted access - publisher's policyThe 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
(International Centre for Numerical Methods in Engineering (CIMNE), 2022)
Conference report
Open AccessLa 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
(CIMNE, 2015)
Conference lecture
Open Access -
Anisotropy effects in a deep excavation in stiff clay
(2013)
Conference report
Open AccessThis 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 ...
