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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL SIMULATION OF UNSATURATED FLOW IN SWELLING POROUS MEDIA

DOI: 10.1615/TFESC1.prm.013041
pages 2251-2263

Nadia Laredj
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

Mustapha Maliki
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

H. Missoum
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

Karim Bendani
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria


KEY WORDS: unsaturated soils, hydro-mechanical processes, coupled model, finite element, back analysis, multiphase flow

Abstract

Different models for the description of swelling pressure in clays have been proposed in recent years. Some models are based on geotechnical properties, these models are empirical, obtained from a statistical approach, others originated from concepts of thermodynamics and another class of models resulted from the diffusive double layer theory of Gouy and Chapman. The swelling characteristics are strongly influenced by the pore fluid chemistry and the mineralogical composition of clays. The composition of interlayer cations controls the interlayer water content. Hence, the saturated water content and the swelling pressure. This study presents the effect of osmotic potential due to chemical solute concentration changes via the use of the net stress, suction and chemical solute concentration elastic constitutive relationship. This model will represent the deformation behaviour exhibited by expansive clays. In particular, it was suggested that the determination of the stiffness of the soil with respect to chemical solute concentration could be achieved via a theoretical approach or by an empirical relationship.

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