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Article: Is the quasi-steady state a real behaviour: a micromechanical perspective

TitleIs the quasi-steady state a real behaviour: a micromechanical perspective
Authors
Issue Date2012
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.geotechnique-ice.com
Citation
Geotechnique, 2012, v. 62 n. 5, p. 466-468 How to Cite?
AbstractWhether the so-called quasi-steady state is a real material response is a fundamental yet controversial question in the study of undrained shear behaviour of sand. An attempt is made here to clarify the question from a micromechanical viewpoint by means of a grain-scale modelling technique combined with statistical analyses. The study shows that the quasi-steady state is a real behaviour rather than a test-induced phenomenon; it is a transition state, and can be regarded as the result of spatial rearrangement of discrete particles sheared under the constant-volume condition. The quasi-steady state has distinct features that make it different from the steady state at both the macro scale and micro scale. During the loading process, the average number of contacts per particle decreases with strain until the quasi-steady state emerges, and after that it increases gradually to an approximately constant value at large deformations associated with the steady state. This result suggests that the loss of contacts is most pronounced at the quasi-steady state. The study also shows that the contact normal forces and particle rotations play a major role in the deformation process, whereas the contributions of contact tangential forces and particle sliding appear to be minor.
DescriptionDiscussion (MM Rahman and SR Lo) and authors' reply (J Yang and BB Dai)
Persistent Identifierhttp://hdl.handle.net/10722/163834
ISSN
2015 Impact Factor: 2.0
2015 SCImago Journal Rankings: 2.837
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYang, Jen_US
dc.contributor.authorDai, BBen_US
dc.contributor.authorRahman, MM-
dc.contributor.authorLo, SR-
dc.date.accessioned2012-09-20T07:52:25Z-
dc.date.available2012-09-20T07:52:25Z-
dc.date.issued2012en_US
dc.identifier.citationGeotechnique, 2012, v. 62 n. 5, p. 466-468en_US
dc.identifier.issn0016-8505-
dc.identifier.urihttp://hdl.handle.net/10722/163834-
dc.descriptionDiscussion (MM Rahman and SR Lo) and authors' reply (J Yang and BB Dai)-
dc.description.abstractWhether the so-called quasi-steady state is a real material response is a fundamental yet controversial question in the study of undrained shear behaviour of sand. An attempt is made here to clarify the question from a micromechanical viewpoint by means of a grain-scale modelling technique combined with statistical analyses. The study shows that the quasi-steady state is a real behaviour rather than a test-induced phenomenon; it is a transition state, and can be regarded as the result of spatial rearrangement of discrete particles sheared under the constant-volume condition. The quasi-steady state has distinct features that make it different from the steady state at both the macro scale and micro scale. During the loading process, the average number of contacts per particle decreases with strain until the quasi-steady state emerges, and after that it increases gradually to an approximately constant value at large deformations associated with the steady state. This result suggests that the loss of contacts is most pronounced at the quasi-steady state. The study also shows that the contact normal forces and particle rotations play a major role in the deformation process, whereas the contributions of contact tangential forces and particle sliding appear to be minor.-
dc.languageengen_US
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.geotechnique-ice.com-
dc.relation.ispartofGeotechniqueen_US
dc.rightsPermission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleIs the quasi-steady state a real behaviour: a micromechanical perspectiveen_US
dc.typeArticleen_US
dc.identifier.emailYang, J: junyang@hkucc.hku.hken_US
dc.identifier.emailDai, BB: daibbing@hku.hken_US
dc.identifier.authorityYang, J=rp00201en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1680/geot.11.D.005-
dc.identifier.scopuseid_2-s2.0-79551607419-
dc.identifier.hkuros206365en_US
dc.identifier.volume62en_US
dc.identifier.issue5en_US
dc.identifier.spage466en_US
dc.identifier.epage468en_US
dc.identifier.isiWOS:000303354500009-
dc.publisher.placeUnited Kingdom-

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