Instability Behaviour Of Sand With Different Types Of Fines
Date
2013
Authors
Rahman, M.M.
Baki, M.A.L.
Lo, S.R.
Editors
Leung, C.
Goh, S.
Shen, R.
Goh, S.
Shen, R.
Advisors
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Conference paper
Citation
Proceedings of the 18th Southeast Asian Geotechnical Conference (18SEAGC) & Inaugural AGSSEA Conference (1AGSSEA), 2013 / Leung, C., Goh, S., Shen, R. (ed./s), pp.473-478
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18th Southeast Asian Geotechnical Conference (18SEAGC) & Inaugural AGSSEA Conference (1AGSSEA) (2013 - 31 May 2013 : Singapore)
Abstract
Instability of loose saturated sandy soils is a common phenomenon associated with deviatoric strain softening and can be identified by the criteria (in the context of continuum mechanics) of dσij dεij < 0 where σij and εij are stress and strain tensors respectively and “d” represents infinitesimal increments. It can be divided into either static or cyclic instability depending on whether it triggered under monotonic or cyclic loading. This study had been carried out to investigate both static and cyclic instability behaviours of Sydney sand with four different types of fines where fines content was kept constant at 15%. Equivalent granular state parameter, ψ* was used to synthesise test results. It was found that all specimens manifested static and cyclic instability had positive ψ *and thus,ψ* can be used to predict instability behaviour. Further, test results showed that soil lost its strength significantly on either side of stress spaces after triggering of cyclic instability.
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Copyright 2013 Geotechnical Society of Singapore (GeoSS)