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dc.contributor.authorFedakar, Halil Ibrahim
dc.contributor.authorCetin, Bora
dc.contributor.authorRutherford, Cassandra J.
dc.identifier.urihttps //
dc.descriptionThe first author of this study would like to thank the Scientific and Technological Research Council of Turkey (TUBITAK) for the financial support during his postdoctoral research at the Department of Civil, Construction and Environmental Engineering, Iowa State University.en_US
dc.description.abstractA moving wheel load induces a principal stress rotation (PSR) in pavement foundation geomaterials including subgrade/subbase soils. Simulating such a stress condition is not possible with stress path tests conducted with conventional cyclic triaxial (CT) equipment. More complex stress paths such as a heart-shaped stress path are required to determine the deformation characteristics of these under a PSR. A heart-shaped stress path can be simulated on a soil specimen in cyclic hollow cylinder (CHC) tests via user-defined waveforms for its stress components (axial stress, and torsional shear stress). In this study, a series of CT and CHC tests were performed to analyze the impact of a PSR on strain behaviors of medium-dense sand-clay mixtures. The specimens contained 0%, 5%, 10%, and 20% clay by weight and were prepared at an initial relative density of 50%. All specimens were anisotropically consolidated under K-0 approximate to 0.5. It was determined that all CT specimens underestimated the strain performances (both axial strain and shear strain) of the sand-clay mixtures. On the other hand, a heartshaped stress path was simulated successfully in CHC tests and thus, all specimens yielded more accurate strain results. At low clay content (<= 10%), the impact of a PSR on strain performances of the sand-clay mixtures was observed to be less (axial strain (epsilon(z)) < 0.12%, and shear strain (gamma(z theta)) 0.8% after number of load cycles (N) = 5000) due to the low stress ratios (CVSR = 0.15 and eta = 1/3). On the other hand, despite the low stress ratios, a PSR caused a rapid increase in axial strain and shear strain (epsilon(z) = 5%, and gamma(z theta) 0.8%) of the specimen containing 20% clay, which resulted in the failure of the specimen at N = 478. Results of this study clearly indicated that the effect of a PSR should be taken into consideration while evaluating the strain characteristics of the sand-clay mixtures that contain clay particularly at high contents (>= 20%) under traffic loads.en_US
dc.description.sponsorshipTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)en_US
dc.subjectA principal stress rotationen_US
dc.subjectA heart-shaped stress pathen_US
dc.subjectHollow cylinder testen_US
dc.subjectTriaxial testen_US
dc.subjectMedium-dense sand-clay mixturesen_US
dc.titleDeformation characteristics of medium-dense sand-clay mixtures under a principal stress rotationen_US
dc.contributor.departmentAGÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümüen_US
dc.contributor.institutionauthorFedakar, Halil Ibrahim
dc.identifier.volumeVolume 30en_US
dc.relation.tubitakFunding Table Funding agency Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)
dc.relation.publicationcategoryMakale - Uluslararası - Editör Denetimli Dergien_US

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