Publications de Mathieu Nuth | EPFL Graph Search

Water retention behavior of deformable soils-experiment and modeling

Lyesse Laloui, Mathieu Nuth, Alessio Ferrari, Simon Salager

The paper presents an experimental and modelling approach for the soil water retention behaviour of two deformable soils. The objective is to investigate the physical mechanisms that govern the soil water retention properties and to propose a constitutive ...

Crc Press-Taylor & Francis Group2014

Constitutive analysis of the mechanical anisotropy of Opalinus Clay

Lyesse Laloui, Bertrand François, Mathieu Nuth, Simon Salager

This paper aims to analyse the anisotropic features of behaviour of Opalinus Clay using the theory of plastic multi-mechanisms. The results of triaxial tests conducted with different load levels and directions showed that the mechanical behaviour of this s ...

Springer Verlag2013

An investigation into the water retention behaviour of deformable soils

Lyesse Laloui, Mathieu Nuth, Alessio Ferrari, Simon Salager

The paper presents an experimental and modelling approach for the soil water retention behaviour of two deformable soils. The objective is to investigate the physical mechanisms that govern the soil water retention properties and to propose a constitutive ...

National Research Council Canada2013

A model for the water retention behavior of deformable soils including capillary hysteresis

Lyesse Laloui, Mathieu Nuth

Experimental findings on the hysteresis of the soil water retention curve, relating the degree of saturation to the matric suction, have to be superimposed with the aspects due to the soil matrix deformation. In order to set a comprehensive model for the r ...

ASCE2011

Modeling the Onset of Shallow Landslides in Partially Saturated Slopes Subjected to Rain Infiltration

Lyesse Laloui, John Eichenberger, Mathieu Nuth

Heavy rainfall can lead to shallow slips on slopes which are often initially in a state of partial water saturation. A multiphysics approach and advanced constitutive modeling are necessary to take into account the physical key processes in partially satur ...

ASCE2011

Benchmarking of constitutive models for unsaturated soils

Lyesse Laloui, Mathieu Nuth

The paper presents a collaborative piece of research undertaken by seven research teams from different universities within the ‘Mechanics of Unsaturated Soils for Engineering’ (MUSE) network. The objective is to benchmark different approaches to constituti ...

2011

Hydromechanically coupled analysis of transient phenomena in a rainfall-induced landslide

Lyesse Laloui, John Eichenberger, Mathieu Nuth

Heavy rainfall can lead to shallow slips in slopes that are initially in a state of partial water saturation. Multiphysics numerical modelling approaches taking into account the involved physical key processes in variably saturated soils during rainfall ev ...

International Center for Computational Engineering (IC2E)2011

Analysis of the compaction phenomena due to the water injection in reservoirs with a three-phase geomechanical model

Lyesse Laloui, Mathieu Nuth

In the coastal regions, the land subsidence due to the industrial pumping of underground fluids such as methane is documented by the means of in situ surveys. The laboratory characterization of the gas bearing formations has also been published, which comp ...

Elsevier2010

Investigations on water retention behaviour of deformable soils

Lyesse Laloui, Mathieu Nuth, Alessio Ferrari, Simon Salager

The trend in modern unsaturated soil mechanics is to enhance the physical understanding of the soil water retention properties. It is agreed that the retention characteristics depend on the state of compaction and are related to the deformability of the me ...

Taylor & Francis Group2010

Anisotropic features of the mechanical behaviour of Opalinus clay

Lyesse Laloui, Mathieu Nuth, Simon Salager

The Opalinus Clay is a potential host rock for radioactive waste repositories. Triaxial tests at different load levels and directions carried out on Opalinus clay showed that the mechanical behaviour of this soft rock is anisotropic. The stiffer samples ar ...

CRC Press2010

On the use of the generalised effective stress in the constitutive modelling of unsaturated soils

Lyesse Laloui, Mathieu Nuth

The definition of a consistent stress framework is an essential prerequisite to the constitutive modelling of unsaturated soils. It is proposed to clarify the effective stress lexicon commonly used for unsaturated soils, one of the purposes being to contri ...

2009

Understanding the thermo-mechanical response of heat exchanger piles

Lyesse Laloui, Hervé Péron, Mathieu Nuth

Although the adaptation of deep foundations into heat exchangers is receiving growing attention, geothermal research is focusing mostly on energy optimization aspects. Meanwhile, the primary bearing function of the foundation must remain unaltered. Also, p ...

International Centre for Computational Engineering2009

Constitutive modelling of unsaturated soils with hydro-geomechanical couplings

Mathieu Nuth

Even though the saturation in water of most natural and engineered soils is partial, constitutive models in geotechnical engineering have long made the assumption of complete saturation. The increasing knowledge of the rheological behaviour of unsaturated ...

EPFL2009

Response to Comment on "On the use of generalised effective stress in the constitutive modelling of unsaturated soils"

Lyesse Laloui, Mathieu Nuth

2009

A thermo-hydro-mechanical stress-strain framework for modeling the performance of clay barriers in deep geological repositories for radioactive waste

Lyesse Laloui, Azad Koliji, Hervé Péron, Bertrand François, Mathieu Nuth

Assessing the performance of deep geological repositories for heat-generating radioactive waste requires reliable predictions of the thermo-hydro-mechanical (THM) behaviour of the clay barriers (the buffer material as well as the host rock/clay). This repr ...

CRC Press2008

Advances in modelling hysteretic water retention curve in deformable soils

Lyesse Laloui, Mathieu Nuth

Experimental findings on the hysteretic nature of the soil water retention curve, relating the degree of saturation to the matric suction, have generally to be superimposed with the aspects due to the deformability of the soil matrix. Indeed, most state-of ...

2008

Advanced hydro-mechanical coupling for unified constitutive modelling of unsaturated soils

Lyesse Laloui, Mathieu Nuth

A new unified constitutive hydro-mechanical model named ACMEG-s is formulated to improve modelling of unsaturated soils in free or constrained conditions. Indeed, due to particular mechanical and hydraulic boundary conditions, some natural and engineered f ...

Taylor & Francis2008

Effective Stress Concept in Unsaturated Soils: Clarification and Validation of an Unified Framework

Lyesse Laloui, Mathieu Nuth

The effective stress principle, conventionally applied in saturated soils, is reviewed for constitutive modelling purposes. The assumptions for the applicability of Terzaghi’s single effective stress are recalled and its advantages are inventoried. The pos ...

2008

Un nouveau cadre constitutif couplé pour la modélisation avancée des sols non saturés

Mathieu Nuth

Most natural and engineered soils usually exhibit a state of partial saturation in water. Indeed, fast and heavy water flowing into the soil is known to cause collapse or soil plasticization which may be at the origin of harmful settlements. The mechanical ...

2008

Investigations on the mechanical behavior of a heat exchanger pile

Lyesse Laloui, Mathieu Nuth

The geothermal use of concrete geostructures (piles, walls and slabs) is an environmentally friendly way of cooling and heating buildings. With such geothermal structures, it is possible to transfer energy from the ground to fluid-filled pipes cast in conc ...

Crc Press-Taylor & Francis Group, 6000 Broken Sound Parkway Nw, Ste 300, Boca Raton, Fl 33487-2742 Usa2008