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Rate-dependent behavior of a saturated reconstituted clay under different over-consolidation ratios and sample variance
Wu, Shengshen1; Lok, Thomas2; Xu, Youwei3; Wang, Weigang4; Wu, Bisheng1
2021-07-27
Source PublicationActa Geotechnica
ISSN1861-1125
Volume16Issue:11Pages:3425-3438
Abstract

This paper intends to study the influence of the shearing rate on the undrained monotonic behavior of marine clay under different over-consolidation ratios and the effect of sample variance. A series of undrained triaxial tests with isotropic consolidation was performed. The tests were either conducted with a constant strain rate (single-stage tests) or with different strain rates applied in succession (multi-stage tests, step-change shearing rate tests), the latter with and without relaxation phases. The tests were conducted on saturated reconstituted Macau marine clay. It has been found that a higher overconsolidation ratio tends to produce a lower excess pore pressure, while faster shearing tends to lead to a higher undrained shear strength and a lower induced excess pore pressure. Besides, the influence of sample variance, which means the differences between the undrained shear strength and excess pore water pressure derived from tests with equal OCR and shearing rate, performed as either a single-stage or a multi-stage test, was found relatively small. It can be concluded that a test with different shearing rates applied in succession to the same specimen is sufficient to study the rate-dependent undrained behavior of saturated clay. Two different approaches for the description of the rate effects on the undrained shear strength, following Mitchell and Soga or Graham et al., respectively, have been extended by the influence of OCR. Based on comparison, the extended equation of Graham et al. seems more appropriate for an application in practice.

KeywordExcess Pore Pressure Overconsolidation Ratio Sample Variance Shear Strength Shearing Rate
DOI10.1007/s11440-021-01293-8
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering
WOS SubjectEngineering, Geological
WOS IDWOS:000679910500006
Scopus ID2-s2.0-85111450312
Fulltext Access
FWCI0.5207675
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorWu, Bisheng
Affiliation1.State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
2.School of Civil and Environmental Engineering, University of Macau, Macao
3.School of Civil Engineering, University of Queensland, Brisbane, Australia
4.School of Civil Engineering, Royal Melbourne Institute of Technology, Melbourne, Australia
Recommended Citation
GB/T 7714
Wu, Shengshen,Lok, Thomas,Xu, Youwei,et al. Rate-dependent behavior of a saturated reconstituted clay under different over-consolidation ratios and sample variance[J]. Acta Geotechnica,2021,16(11):3425-3438.
APA Wu, Shengshen,Lok, Thomas,Xu, Youwei,Wang, Weigang,&Wu, Bisheng.(2021).Rate-dependent behavior of a saturated reconstituted clay under different over-consolidation ratios and sample variance.Acta Geotechnica,16(11),3425-3438.
MLA Wu, Shengshen,et al."Rate-dependent behavior of a saturated reconstituted clay under different over-consolidation ratios and sample variance".Acta Geotechnica 16.11(2021):3425-3438.
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