A Micromechanical Model for Unsaturated Soils Based on Thermodynamics

Chaofa Zhao, Younes Salami, Zhen Yu Yin, Pierre Yves Hicher

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)


This paper presents a micromechanical model for unsaturated granular soils based on thermodynamics. The dissipation of energy is examined at the level of the particle contacts. The total Helmholtz free energy is separated between a mechanical and a hydraulic part, each of which is a function of either the elastic displacement or the degree of saturation at the micro scale. The dissipation of energy, assumed to be frictional in origin, is a function of the plastic displacements at the micro scale. Both the Helmholtz free energy and the dissipative energy are volumetrically averaged from the micro to the macro scale. The Chang-Hicher micromechanical model has been adopted for the deformation of the skeleton, whereas a hydraulic potential dependent on the size of the particles has been chosen for the expression of the water retention.

Original languageEnglish
Title of host publicationPoromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics
EditorsPatrick Dangla, Jean-Michel Pereira, Siavash Ghabezloo, Matthieu Vandamme
PublisherAmerican Society of Civil Engineers (ASCE)
Number of pages8
ISBN (Electronic)9780784480779
Publication statusPublished - 1 Jan 2017
Externally publishedYes
Event6th Biot Conference on Poromechanics, Poromechanics 2017 - Paris, France
Duration: 9 Jul 201713 Jul 2017

Publication series

NamePoromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics


Conference6th Biot Conference on Poromechanics, Poromechanics 2017

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics

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