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MODELING THE EFFECT OF OSMOTIC POTENTIAL CHANGES ON DEFORMATION BEHAVIOR OF SWELLING CLAYS

Volume 13, Issue 8, 2010, pp. 743-748
DOI: 10.1615/JPorMedia.v13.i8.50
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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, whereas 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, and 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 based on elastic constitutive relationship. This model will represent the deformation behavior 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 an empirical relationship. An exercise is performed to show the ability of the model to represent the trend of the observed behavior.

CITED BY
  1. Rutqvist Jonny, Zheng Liange, Chen Fei, Liu Hui-Hai, Birkholzer Jens, Modeling of Coupled Thermo-Hydro-Mechanical Processes with Links to Geochemistry Associated with Bentonite-Backfilled Repository Tunnels in Clay Formations, Rock Mechanics and Rock Engineering, 47, 1, 2014. Crossref

  2. Zheng Liange, Rutqvist Jonny, Birkholzer Jens T., Liu Hui-Hai, On the impact of temperatures up to 200 °C in clay repositories with bentonite engineer barrier systems: A study with coupled thermal, hydrological, chemical, and mechanical modeling, Engineering Geology, 197, 2015. Crossref

  3. Zheng Liange, Rutqvist Jonny, Xu Hao, Birkholzer Jens T., Coupled THMC models for bentonite in an argillite repository for nuclear waste: Illitization and its effect on swelling stress under high temperature, Engineering Geology, 230, 2017. Crossref

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