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

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Hydrogeochemical Modelling of Variably Saturated Soils

Laurin Wissmeier

This thesis is about the simulation of flow, transport and geochemical reactions in variably saturated soils. Motivated by the problematic disposal and revegetation of residue from aluminium refining, novel modelling tools for general geochemical reactions ...

EPFL2010

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

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

Thermo-plasticity of fine-grained soils at various saturation states

Bertrand François

Soil is a particulate material that may undergo irreversible strain as the relative positions of the constituent particles change. That irreversible behaviour may be induced not only by an external stress variation but also by temperature or suction change ...

EPFL2008

Mechanical behaviour of unsaturated aggregated soils

Azad Koliji

Particle aggregation is a commonly observed phenomenon in many types of soils, such as natural clays and agricultural soils. These soils contain porous aggregates, often separated by large, interaggregate pores. Two levels of intra- and interaggregate poro ...

EPFL2008

ACMEG-TS: A constitutive model for unsaturated soils under non-isothermal conditions

Lyesse Laloui, Bertrand François

This paper introduces an unconventional constitutive model for soils which deals with a unified thermo-mechanical modelling for unsaturated soils. The relevant temperature and suction effects are studied in light of elasto-plasticity. A generalized effecti ...

2008

Unsaturated soils under non-isothermal conditions: Framework of a new constitutive model

Lyesse Laloui, Bertrand François

This paper addresses a new, unified thermo-mechanical constitutive model for unsaturated soils through a coupled study. In the context of elasto-plasticity and the critical state theory, the model uses the concepts of multi-mechanism and bounding surface t ...

2008

Thermo-plasticity in unsaturated soils, a constitutive approach

Lyesse Laloui, Bertrand François

Research interest in the thermo-mechanical behaviour of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving both thermal and unsaturated effects. A new constitutive model dealing with partially saturated soi ...

2008

Desiccation cracking of soils

Hervé Péron

Desiccation cracking of soils is of great importance in geotechnical and geoenvironmental engineering. In many circumstances it is the cause of damages in earthen and soil supported structures. Desiccation cracking affects clayey soil barriers for waste st ...

EPFL2008

Unified stress framework for modelling unsaturated subsoil behaviour

Lyesse Laloui, Mathieu Nuth

Traffic loads combined with moisture variations are the most harmful for road structures. Even if the pavement is assumed to have an elastic behaviour, the partially saturated subsoil can present irreversible strains that endanger the integrity of the road ...

2007