Volume 24 Issue 5
Oct.  2018
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LI Xiaoyue, XU Yongfu, 2018. THE CALCULATION METHOD FOR OSMOTIC SUCTION OF SALINE SOLUTION. Journal of Geomechanics, 24 (5): 723-729. DOI: 10.12090/j.issn.1006-6616.2018.24.05.074
Citation: LI Xiaoyue, XU Yongfu, 2018. THE CALCULATION METHOD FOR OSMOTIC SUCTION OF SALINE SOLUTION. Journal of Geomechanics, 24 (5): 723-729. DOI: 10.12090/j.issn.1006-6616.2018.24.05.074
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THE CALCULATION METHOD FOR OSMOTIC SUCTION OF SALINE SOLUTION

doi: 10.12090/j.issn.1006-6616.2018.24.05.074

  • Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China

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  • Received: 2018-06-08
  • Revised: 2018-07-30
  • Published: 2018-10-01
    Abstract
  • When bentonite cushion contacts with surrounding rocks in a disposal repository of highly radioactive waste, its mechanical properties will be affected by the saline solution contained in surrounding rock cracks, and the osmotic suction of salt solution will add additional stress similar to vertical load on bentonite. Therefore, quantifying the effect of saline solution on the mechanical properties of bentonite is of great significance for evaluating the safety of underground repository. Osmotic coefficients as the key to calculate the osmotic suction are usually obtained by complex tests, which obstructs the practical engineering applications. The Debye-Hückel formula are introduced to calculate the osmotic coefficients and osmotic suction for monovalent ion electrolyte, 2-2 type electrolyte and mixed electrolyte solutions. The impact of various factors on solution suction coefficients, such as solvent type, solute type, solute concentration and temperature are analyzed. Then the calculation method of osmotic suctions of different solutions are obtained. Based on the Debye-Hückel formula, the influence of solvent type and temperature on the osmotic suction coefficient is analyzed. The results show that the larger the solvent polarity, the larger the osmotic suction coefficient; the higher the temperature, the smaller the osmotic suction coefficient.

     

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