Mécanismes des Nano et Micro-structures au comportement hydromécanique des argiles non saturées

par Qianfeng Gao

Projet de thèse en Sciences

Sous la direction de Mahdia Hattab et de Jean-Marie Fleureau.

Thèses en préparation à l'Université de Lorraine , dans le cadre de EMMA - Ecole Doctorale Energie - Mécanique - Matériaux depuis le 12-10-2015 .

  • Pas de résumé en français disponible.

  • Titre traduit

    Nano and Microstructural Mechanisms in Hydromechanical Behaviour of Unsaturated Clays

  • Résumé

    The compaction energy (mechanic effect), the electrolyte nature (chemical effect), and the wetting-drying process (hydrous effect) impact the engineering properties of clays by changing the microstructure. Most often, the clays subjected to complex suction-stress paths, which cause many problems for both structures built on clays (shallow foundations, retaining structures, landfill liner systems, earth dam cores) and buried structures (tunnels, drains, deep foundations). Therefore, it is important to study the hydromechanical behaviour of unsaturated clays at micro or even nano scales. To address this issue, the following work will be carried out in the thesis: exploring the microstructural evolution of clay particles on different triaxial stress path, performing the macroscopic and microscopic research of unsaturated clays, and establishing a 2D model for the formation of shrinkage and cracks of kaolinite.