The combined effect of clay and moisture content on very small strain stiffness of compacted sand-clay mixture

Vasileios Matziaris, Meghdad Bagheri

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

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Abstract

The very small strain shear modulus (stiffness) of soils, Gmax, is one of the most important parameters for predicting ground movements and dynamic responses of geo-structures. In this study, the combined effect of clay fraction and moisture content on shear stiffness of an unsaturated sand-clay mixture at very small strains was investigated using bender elements. Compacted soil specimens were prepared at three different clay contents of 10, 20, and 30%, and at four different initial moisture contents of 3, 6, 9 and 12%. Bender element tests were carried out under isotropic and constant moisture content conditions and inside a modified triaxial testing system equipped with a pair of piezoelectric bender-extender elements. Gmax was calculated based on the velocity measurement of shear waves propagated through the specimen. The tests results showed that Gmax decreases approximately linearly with an increase in moisture content, and non-linearly with an increase in clay content. A basic empirical equation was derived from an examination of trends in evolution of Gmax with clay and moisture content. Additional empirical correlations were also derived for estimation of moisture content and degree of saturation based on the compression wave velocity measurements.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering
EditorsMizanur Rahman, Mark Jaksa
PublisherInternational Society for Soil Mechanics and Geotechnical Engineering
Pages1427-1431
Number of pages5
Volume2
ISBN (Print)978-0-9946261-4-1
Publication statusPublished - 2022
Event20th International Conference on Soil Mechanics and Geotechnical Engineering - Sydney, Australia
Duration: 1 May 20225 May 2022
Conference number: 20
http://icsmge2021.org/

Conference

Conference20th International Conference on Soil Mechanics and Geotechnical Engineering
Country/TerritoryAustralia
CitySydney
Period1/05/225/05/22
Internet address

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Keywords

  • Small strain stiffness
  • Bender elements
  • Moisture content
  • Clay content

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