Soil Mechanics and Foundation Engineering

, Volume 56, Issue 4, pp 265–272 | Cite as

Effect of Pore Fluid Concentration on Shear Strength of Soft Clay

  • Ying-guang Fang
  • Zhen-feng OuEmail author
  • Bo Li

Consolidated quick direct shear tests were conducted on bentonite and mixed bentonitekaolin soils with different concentrations of sodium chloride solution. The physical mechanism of the pore fluid concentration effect was explained at the micro level on the basis of micro forces among particles. The test results indicated that the shear strength of bentonite and bentonite-kaolin noticeably varied with increase in sodium chloride solution concentration, especially under high vertical stress. The friction angle increased with the pore fluid concentration, but the cohesion decreased. With increase in pore fluid concentration, the electric double-layer repulsion among soil particles decreased, thereby increasing the effective contact stress at the mineral-mineral contact and leading to increased consolidation settlement and a lower water content under vertical stress. This means a larger shearing resistance at the mineral-mineral contact point and a thinner absorbed water layer at the mineral-water-mineral contact point, leading to a greater friction angle and a lower cohesion.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    L. M. Shekhtman, V. T. Baranov, and G. F. Nesterenko, "Building deformations caused by the leakage of chemical reagents," Soil Mech. Found. Eng., 32, 32-36 (1995).CrossRefGoogle Scholar
  2. 2.
    W. S. Abdullah, M. S. Al-Zou'bi, and K. A. Alshibli, "On the physicochemical aspects of compacted clay compressibility," Can. Geotech. J., 34, 551-559 (1997).CrossRefGoogle Scholar
  3. 3.
    J. K. Mitchell and S. Kenichi, Fundamentals of Soil Behavior, 3rd ed, John Wiley & Sons, Inc., New York (2005).Google Scholar
  4. 4.
    D. E. Smiles, "Effects of solutes on clay-water interactions: some comments," Appl. Clay Sci., 42, 158-162 (2008).CrossRefGoogle Scholar
  5. 5.
    F. Liu., H. Fu, J. Wang, W. Mi, Y. Cai, and X. Ceng, "Influence of soluble on electro-osmotic consolidation of soft clay," Soil Mech. Found. Eng., 54, 49-55 (2017).Google Scholar
  6. 6.
    B. M. Sunil, S. Shrihari, and S. Nayak, "Shear strength characteristics and chemical characteristics of leachate-contaminated lateritic soil," Eng. Geol.,106, 20-25 (2009).CrossRefGoogle Scholar
  7. 7.
    Y. F. Deng, X. B. Yue, Y. J. Cui, G. H. Shao, S. Y. Liu, and D. W. Zhang, "Effect of pore water chemistry on the hydro-mechanical behavior of Lianyungang soft marine clay," Appl. Clay Sci.,123, 279-184 (2016).CrossRefGoogle Scholar
  8. 8.
    Liang J. W., Fang Y. G.?and Chen S., "Experimental research on effect of salt content on strength of tiny-particle clay," Chin. J. Rock Mech. Eng., 28, 3821-3829 (2009).Google Scholar
  9. 9.
    C. Di Maio, "The influence of pore fluid composition on the residual shear strength of some natural clayey," Soils. VII International Symposium on Landslides,2, 1189-1194 (1996).Google Scholar
  10. 10.
    R. Moore "The chemical and mineralogical controls upon the residual strength of pure and natural clays," Geotechnique, 41, 35-47(1991).CrossRefGoogle Scholar
  11. 11.
    R. Moore "Discussion: the chemical and mineralogical controls upon the residual strength of pure and natural clays," Geotechnique, 42, 151-153(1992).Google Scholar
  12. 12.
    C. Di Maio and G. B. Fenelli, "Residual strength of kaolin and bentonite: the influence of their constituent pore fluid," Geotechnique, 44, 217-226 (1994).CrossRefGoogle Scholar
  13. 13.
    A. S. Wahid, A. Cajo, and R. Di Maggio, "Chemo-mechanical effects in kaolinte. Part 1: prepared samples," Geotechnique, 61, 439-447 (2011).CrossRefGoogle Scholar
  14. 14.
    A. Sridharan, A. El-Shafei, and N. Miura, "Mechanisms controlling the undrained strength behavior of remolded Ariake marine clays," Mar. Georesour. Geotechnol., 20, 21-50 (2002).CrossRefGoogle Scholar
  15. 15.
    A. Gajo and M. Maines, "Mechanical effects of aqueous solutions of inorganic acids and bases on a natural active clay," Geotechnique, 57, 687-699 (2007).CrossRefGoogle Scholar
  16. 16.
    Long Zhang, Dean Sun, and Di Jia, "Shear strength of GMZ07 bentonite and its mixture with sand saturated with saline solution," Appl. Clay Sci., 132, 24-32 (2016).CrossRefGoogle Scholar
  17. 17.
    G. V. Rao and A. Sridharan "Shear strength behaviour of saturated clays and the role of the effective stress concept," Geotechnique, 29, 177-193 (1979).CrossRefGoogle Scholar
  18. 18.
    B. Dolinar and B. Maruh, " Determining the thickness of adsorbed water layers on the external surfaces of clay minerals based on the engineering properties of soils," Appl. Clay Sci., 123, 279-184 (2016).CrossRefGoogle Scholar
  19. 19.
    H. Van Olphen, An Introduction to Clay Colloid Chemistry, China Agriculture Press, Beijing, 1982.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Civil and Transportation InstituteSouth China University of TechnologyGuangzhouChina
  2. 2.State Key Laboratory of Subtropical Building ScienceGuangzhouChina

Personalised recommendations