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

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Compression Tests on a Sandy Silt at Different Suction and Temperature Levels

Lyesse Laloui, Bertrand François, Simon Salager, David Ubals Picanyol

This paper presents a unified thermo-mechanical experimental study on a remoulded unsaturated sandy silt and brings a contribution to the understanding of the fundamental mechanics of unsaturated soils in non- isothermal conditions. The experimental progra ...

2007

An improved volume measurement for determining soil water retention curve

Lyesse Laloui, Hervé Péron

The complete determination of soil water retention curve requires the sample volume to be measured, in order to calculate its void ratio and saturation degree. During drying in the pressure plate apparatus, cracks often appear in the sample altering its de ...

2007

Anisotropy factor of saturated and unsaturated soils

Dani Or

Variations in the degree of anisotropy in soil hydraulic conductivity with changes in water saturation (S-e) may adversely impact predictability of flow and transport processes. The conceptual "layered cake'' model was extended to consider effects of bulk ...

2006

An introduction to the constitutive modelling of unsaturated soils

Lyesse Laloui, Mathieu Nuth

An introduction to the constitutive modelling of unsaturated soils is presented. To facilitate understanding by the inexperienced reader, the paper considers the basic aspects of modelling of the behaviour of unsaturated soils from a qualitative point of v ...

2005

The influence of void content on the structural flexural performance of unidirectional glass fibre reinforced polypropylene composites

Voids are often present in composite materials and have, as may be expected, negative effects on the mechanical properties. As a consequence, it is regarded to be important to optimise manufacturing techniques of composite materials towards minimum void co ...

2005

Consolidation and deconsolidation in composite processing

In composite processing, a compressible dry fiber preform is in many cases impregnated by a molten polymeric matrix. The impregnated part is sometimes used as produced, but most often it requires a reheating step before stamping, flow molding or even paint ...

EPFL2004

Comportement mécanique d'un limon non saturé

Although the majority of soils are unsaturated, their mechanical behaviour is still not well defined. This dissertation presents first an experimental study of an unsaturated silt and then proposes an elasto-plastic constitutive law to model the behaviour ...

EPFL1999

Soil properties and water movement

David Andrew Barry, Marc Parlange

The vadose zone is the region between ground level and the upper limits of soil fully saturated with water. Hydrology in the zone is complex: nonlinear physical, chemical, and biological interactions all affect the transfer of heat, mass, and momentum betw ...

Oxford University Press1999

Thermodynamics of Saturated and Unsaturated Soils.

Lyesse Laloui, Laurent Vulliet

An understanding of the behaviour of saturated/unsaturated soils is important for the design and analysis of geostructures. In this paper a continuum approach based on a structured thermodynamic theory of mixtures developed by Svendsen & Hutter (1995), in ...

1998

Numerical modeling of unsaturated porous media as a two and three phase medium : a comparison.

Lyesse Laloui, Laurent Vulliet, Georg Klubertanz

A numerical simulation of the hydro-mechanical behaviour of an unsaturated porous medium is presented. The coupled hydro-mechanical model used is based on the continuum theory of mixtures and treats the unsaturated soil as a three phase porous medium (soli ...

1997