The combined effect of clay and moisture content on very small strain stiffness of compacted sand-clay mixture
Conference paper
Bagheri, M. and Matziaris, V. 2022. The combined effect of clay and moisture content on very small strain stiffness of compacted sand-clay mixture. ICSMGE 2022: 20th International Conference on Soil Mechanics and Geotechnical Engineering. Sydney, Australia 01 - 05 May 2022 Australian Geomechanics Society.
Authors | Bagheri, M. and Matziaris, V. |
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Type | Conference paper |
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. |
Keywords | Small strain stiffness; Bender elements; Moisture content; Clay content |
Year | 2022 |
Conference | ICSMGE 2022: 20th International Conference on Soil Mechanics and Geotechnical Engineering |
Publisher | Australian Geomechanics Society |
International Society for Soil Mechanics and Geotechnical Engineering | |
Publisher's version | License File Access Level Anyone |
Publication dates | |
2022 | |
Publication process dates | |
Deposited | 21 Feb 2024 |
Book title | A Geotechnical Discovery Down Under: Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering |
Book editor | Rahman, M. M. |
Jaksa, M. | |
ISBN | 9780994626141 |
Web address (URL) of conference proceedings | https://www.issmge.org/publications/online-library?database=1&conference=120 |
Copyright holder | © 2022, The Authors |
https://repository.uel.ac.uk/item/8x4x4
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