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Geotechnical and Geological Engineering

, Volume 28, Issue 2, pp 199–207 | Cite as

A New Concept on the Compressibility of Mixed Soils: Experimental and Numerical Approach

  • S. TsotsosEmail author
  • F. E. Karaoulanis
  • T. Chatzigogos
Technical note

Abstract

In this article, a new concept on the compressibility of mixed soils is proposed. Six characteristic structures of mixed soils are recognized, defined and described based on the percentage of the ground material in the mixture. The compressibility mechanism and the deformational behavior of each structure are extensively studied by both laboratory and numerical experiments. Two series of compressibility tests are initially conducted in the laboratory, using artificial mixtures of sand and clay at different ratios and subjected to typical compressibility tests using the oedometer apparatus. Then, a numerical approach is employed, based on the finite element method and Monte-Carlo simulations, in order to reproduce the conditions of the laboratory tests and to further study the compressibility of each characteristic structure. From the results obtained, it is concluded that the deformational behavior of mixed soils depends strongly on the percentage of the ground in the mixture and on the mechanical properties of the components of this mixture. Furthermore, it is shown that the estimated deformations and stress states can be highly unrealistic when the mixed soil is not properly modelled and is assumed to be governed by the properties of its weaker component.

Keywords

Compressibility Geotechnical modelling Laboratory testing Mixed soils Numerical analysis Soil formation 

Notes

Acknowledgments

F. E. Karaoulanis would like gratefully to acknowledge financial support of the Greek State Institute of Scholarships (I.K.Y.).

References

  1. Blight GE (1997) Origin and formation of residual soils. In: Blight GE (ed) Mechanics of residual soils. Balkema, RotterdamGoogle Scholar
  2. Craig RF (1997) Soil mechanics, 6th edn. E & FN Spon, LondonGoogle Scholar
  3. Cubrinovski M, Ishihara K (2002) Maximum and minimum void ratio characteristics of sands. Soil Found 42(6):65–78Google Scholar
  4. Harr ME (1987) Reliability based design in civil engineering. Dover, MineolaGoogle Scholar
  5. Kolbuszewski JJ (1948) An experimental study of the maximum and minimum porosities of sands. In: Proceedings of the 2nd international conference on soil mechanics and foundation engineering, Rotterdam, vol 1, pp 158–165Google Scholar
  6. Lade PV, Liggio CD, Yamamuro JA (1998) Effects of non-plastic fines on minimum and maximum void ratio of sand. Geotech Test J, GTJODJ 21(4):336–347CrossRefGoogle Scholar
  7. Medley E (2001) Orderly characterization of chaotic Franciscan Melanges. Felsbau 19(4):20–33Google Scholar
  8. Mitchell JK, Soga K (2005) Fundamentals of soil behavior, 3rd edn. John Wiley & SonsGoogle Scholar
  9. nemesis (2007) An experimental finite element code. http://www.nemesis-project.org. Retrieved on 01 July 2007
  10. Soil Survey Division Staff (1993) Soil survey manual. Soil Conservation Service. US Department of Agriculture Handbook 18Google Scholar
  11. Tsotsos S, Grammatikopoulos I, Moditsis P (2006) A study of the compressibility of composite geomaterials (rocky fragments surrounded by soil). In: Proceedings of 5th Hellenic Conference on Geotechnical and Geoenvironmental Engineering, Xanthi, Greece, vol 1, pp 309–316, June–May 2006Google Scholar
  12. van Breemen N, Buurman P (2002) Soil formation, 2nd edn. Kluwer Academic PublishersGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • S. Tsotsos
    • 1
    Email author
  • F. E. Karaoulanis
    • 1
  • T. Chatzigogos
    • 1
  1. 1.Department of Civil EngineeringAristotle University of ThessalonikiThessalonikiGreece

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