Effects of fines on stress-strain behaviour of sands
Date
2012
Authors
Arefi, M.J.
Cubrinovski, M.
Rahman, M.M.
Editors
Narsilio, G.A.
Arulrajah, A.
Kodikara, J.
Arulrajah, A.
Kodikara, J.
Advisors
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Conference paper
Citation
Proceedings of 'Ground Engineering in a Changing World', the 11th Australia New Zealand Conference on Geomechanics (ANZ 2012), 2012 / Narsilio, G.A., Arulrajah, A., Kodikara, J. (ed./s), pp.871-876
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11th Australia - New Zealand Conference on Geomechanics : Ground Engineering in a Changing World (15 Jul 2012 - 18 Jul 2012 : Melbourne, Australia)
Abstract
A series of bender element tests for small-strain range and stress-controlled dynamic triaxial tests for higher-strain range have been conducted on clean sand and sandy soils sourced from Christchurch, New Zealand. The sandy soils were prepared by mixing clean sand with three different percentages of fines (particle diameter s 75μm) contents. Thus, the testing program was designed to quantify the effects of fines on the shear wave velocity, Vs , stress-strain relationship, and corresponding modulus and damping properties at different relative densities. Shear wave velocity of silty sand is shown to be significantly smaller than the respective values for clean sands at the same void ratio, e. However, the difference in the nonlinear behaviour of clean sand and sandy soils was small. For loose samples prepared at an identical relative density, the behaviour of clean sand was less nonlinear as compared to sandy soils with higher fines content. This difference in the nonlinear behaviour of clean sand and sandy soils was negligible for dense soils. In order to establish a common basis for comparison of behaviour of clean sands and sands with fines, equivalent granular void ratio, e*, is employed. Therefore, modelling of the variability of shear wave velocity, modulus reduction and damping curves versus void ratio for clean sands and sands with fines, irrespective of their fines content, is achievable.
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Copyright [2012] The Authors