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Bertrand François

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Publications associées (35)

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The aim of the TIMODAZ project is to investigate the effect of thermal changes on the excavation damaged zone (EDZ) around nuclear deep disposals in clay-based geological formations. In the framework of WP5.2 of this project, it is intended to develop cons ...

European Commission2012

Numerical analysis of a near-to-real scale in-situ experiment of a deep geological repository

Lyesse Laloui, Bertrand François, Fabrice Dupray

Deep geological repository involving a multi-barrier system constitutes one of the most promising options to isolate high-level radioactive waste from the human environment. In order to certify the efficiency of waste isolation, it is essential to understa ...

International Center for Computational Engineering (IC2E)2011

Temperature-dependent internal friction of clay in a cylindrical heat source problem

Lyesse Laloui, Bertrand François

The effect of the temperature dependence of the internal friction angle is studied in a boundary value problem simulating the impact of a cylindrical heat source on the soil mass in which it is embedded. This follows a previous study which shows that such ...

2011

Thermal variability of the internal friction in clay in a cylindrical thermo-mechanical problem

Lyesse Laloui, Bertrand François

Variability of the internal friction angle with temperature is studied in a boundary value problem numerically simulating the impact of a cylindrical heat source on the stress and strain in soil mass in which it is emplaced. Even if the thermal increase of ...

International Center for Computational Engineering (IC2E)2011

Non-isothermal infiltration in plastic bentonite

Lyesse Laloui, Bertrand François

In deep geological repository involving a multi-barrier system, the engineered materials, generally made of bentonite, constitute an important mechanical, thermal and hydraulic barrier to prevent the interaction between wastes and biosphere. To better unde ...

Taylor & Francis Group2010

An oedometer for studying combined effects of temperature and suction on soils

Lyesse Laloui, Bertrand François

This paper reports the development of an advanced thermo-hydro-mechanical (THM) oedometer in order to characterize the behavior of soils under combined non-isothermal and unsaturated conditions. The simultaneous control of temperature, suction and stress s ...

ASTM International2010

Following the need for understanding and quantifying the effect of temperature on the response of a candidate host formation for radioactive waste disposal, finite element modelling of an in-situ thermal experiment has been carried out. Based on a thermo-h ...

2009

This paper addresses an advanced and unified thermo-mechanical constitutive model for cohesive soils. Based on experimental evidence showing the non-linear and irreversible thermo-mechanical responses of saturated soils, the constitutive equations of the d ...

2009

Thermal variability of the coefficient of the critical state, or the angle of internal friction is examined in view of experimental results obtained for clays and hard rocks. This sensitivity has several implications for the evolution of what is considered ...

INTERNATIONAL CENTRE FOR COMPUTATIONAL ENGINEERING (IC 2E)2009

Explaining thermal failure in saturated clays

Lyesse Laloui, Bertrand François

Failure conditions in soils at elevated temperatures appear to be strongly dependent on the history of the application of stress and temperature. Four cases of such history leading to various modes of failure are identified and interpreted in terms of Ther ...

2009