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Factors affecting pre-failure instability of sand under plane-strain conditions

Wanatowski, D.; Chu, J.

Authors

D. Wanatowski dariusz.wanatowski@nottingham.ac.uk

J. Chu

Abstract

Experimental data obtained from a plane-strain appara- tus are presented in this paper to show that a pre-failure instability in the form of a rapid and sustained increase in strain rate can occur for both contractive and dilative sand under fully drained conditions. However, this type of instability is different from the runaway type of instability observed under undrained conditions, and has therefore been called conditional instability. Despite the differences, the conditions for both types of instability are the same for contractive sand. There are also other factors that affect the pre-failure instability of sand ob- served in the laboratory. These include the stress ratio, void ratio, sand state, load control mode and reduction rate of the effective confining stress. In this paper, these factors are discussed and analysed using experimental data obtained from undrained instability (or creep) tests and constant shear drained (CSD) tests carried out under plane-strain conditions.

Journal Article Type Article
Publication Date Feb 28, 2012
Journal Géotechnique
Print ISSN 0016-8505
Electronic ISSN 0016-8505
Publisher Thomas Telford
Peer Reviewed Peer Reviewed
Volume 62
Issue 2
Institution Citation Wanatowski, D., & Chu, J. (2012). Factors affecting pre-failure instability of sand under plane-strain conditions. Géotechnique, 62(2), doi:10.1680/geot.9.P.111
DOI https://doi.org/10.1680/geot.9.P.111
Keywords failure, laboratory tests, liquefaction, pore pres- sures, sands, slopes
Publisher URL https://doi.org/10.1680/geot.9.P.111
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Copyright ICE Publishing.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf




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