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Etude du comportement des sols non-saturés compactés avec la prise en compte de leur traitement à la chaux [Study on the behavior of unsaturated compacted soils with the consideration of their lime-treatment]

[In this study, we use the concepts of unsaturated compacted soil mechanics and extend them to consider their lime-treatment. Unsaturated soils are multiphasic and heterogenic materials. These characteristics imply an important complexity of the soil behavior. Indeed, the mechanical response depends on the water retention behaviour. In addition, the microstructure of the soil, affected by the way the soil is compacted, plays also an important role on its mechanical behaviour. The stress-strain relations obtained from experimental tests (triaxial tests, oedometric compressions, uniaxial compressions) are used as input values for the development of the model.This work is divided in two main parts. The concepts of unsaturated soil mechanics are first applied to untreated soil. So doing, a behavioural law for compacted unsaturated soil is developed. Then, this constitutive framework will be extended to the consideration of the soil treatment with lime. The soil suction (linked to its water content) is a key parameter that relates the behaviour of both untreated and treated materials (the efficiency of the treatment with lime being strongly related to the water content of the material). So, a rigorous quantification of the water retention curve (relating suction to water content or degree of saturation) is essential.]





disciplines et mots clés déclarés

Construction sous-oeuvre

environemental geomechanics lime treatment unsaturated soil