Stiffness Evolution in Frozen Sands Subjected to Stress Changes

Handle URI:
http://hdl.handle.net/10754/623447
Title:
Stiffness Evolution in Frozen Sands Subjected to Stress Changes
Authors:
Dai, Sheng; Santamarina, Carlos ( 0000-0001-8708-2827 )
Abstract:
Sampling affects all soils, including frozen soils and hydrate-bearing sediments. The authors monitor the stiffness evolution of frozen sands subjected to various temperature and stress conditions using an oedometer cell instrumented with P-wave transducers. Experimental results show the stress-dependent stiffness of freshly remolded sands, the dominant stiffening effect of ice, creep after unloading, and the associated exponential decrease in stiffness with time. The characteristic time for stiffness loss during creep is of the order of tens of minutes; therefore it is inevitable that frozen soils experience sampling disturbances attributable to unloading. Slow unloading minimizes stiffness loss; conversely, fast unloading causes a pronounced reduction in stiffness probably attributable to the brittle failure of ice or ice-mineral bonding.
KAUST Department:
Earth Science and Engineering Program
Citation:
Dai S, Santamarina JC (2017) Stiffness Evolution in Frozen Sands Subjected to Stress Changes. Journal of Geotechnical and Geoenvironmental Engineering 143: 04017042. Available: http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001713.
Publisher:
American Society of Civil Engineers (ASCE)
Journal:
Journal of Geotechnical and Geoenvironmental Engineering
Issue Date:
21-Apr-2017
DOI:
10.1061/(asce)gt.1943-5606.0001713
Type:
Article
ISSN:
1090-0241; 1943-5606
Sponsors:
This research was funded by the U.S. DOE project on methane hydrates. Additional support was provided by the KAUST endowment. The authors are grateful to the anonymous reviewers and the editor for their insightful comments.
Additional Links:
http://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0001713
Appears in Collections:
Articles; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorDai, Shengen
dc.contributor.authorSantamarina, Carlosen
dc.date.accessioned2017-05-09T12:54:46Z-
dc.date.available2017-05-09T12:54:46Z-
dc.date.issued2017-04-21en
dc.identifier.citationDai S, Santamarina JC (2017) Stiffness Evolution in Frozen Sands Subjected to Stress Changes. Journal of Geotechnical and Geoenvironmental Engineering 143: 04017042. Available: http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001713.en
dc.identifier.issn1090-0241en
dc.identifier.issn1943-5606en
dc.identifier.doi10.1061/(asce)gt.1943-5606.0001713en
dc.identifier.urihttp://hdl.handle.net/10754/623447-
dc.description.abstractSampling affects all soils, including frozen soils and hydrate-bearing sediments. The authors monitor the stiffness evolution of frozen sands subjected to various temperature and stress conditions using an oedometer cell instrumented with P-wave transducers. Experimental results show the stress-dependent stiffness of freshly remolded sands, the dominant stiffening effect of ice, creep after unloading, and the associated exponential decrease in stiffness with time. The characteristic time for stiffness loss during creep is of the order of tens of minutes; therefore it is inevitable that frozen soils experience sampling disturbances attributable to unloading. Slow unloading minimizes stiffness loss; conversely, fast unloading causes a pronounced reduction in stiffness probably attributable to the brittle failure of ice or ice-mineral bonding.en
dc.description.sponsorshipThis research was funded by the U.S. DOE project on methane hydrates. Additional support was provided by the KAUST endowment. The authors are grateful to the anonymous reviewers and the editor for their insightful comments.en
dc.publisherAmerican Society of Civil Engineers (ASCE)en
dc.relation.urlhttp://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0001713en
dc.subjectWave velocityen
dc.subjectSampling effecten
dc.subjectCreepen
dc.subjectCoda wave interferometryen
dc.subjectCementationen
dc.subjectFreeze samplingen
dc.titleStiffness Evolution in Frozen Sands Subjected to Stress Changesen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalJournal of Geotechnical and Geoenvironmental Engineeringen
dc.contributor.institutionAssistant Professor, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332-0355en
kaust.authorSantamarina, Carlosen
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