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Article: Behavior of rounded granular materials in direct shear: Mechanisms and quantification of fluctuations

TitleBehavior of rounded granular materials in direct shear: Mechanisms and quantification of fluctuations
Authors
KeywordsDirect shear
Granular material
Stress fluctuation
Shear stress
Shear mode
FFT
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo
Citation
Engineering Geology, 2010, v. 115 n. 1-2, p. 96-104 How to Cite?
AbstractFluctuations of vertical displacement and shear stress are routinely observed during shear tests on granular materials. This study was designed to examine these fluctuations to gain insight into their shear behavior. Three distinct particle size mixtures of glass beads were tested by an intermediate direct shear apparatus at four normal stress levels and three shearing rates. Based on examination of the onset and nature of growth/decay patterns of the fluctuations, four distinct stages were identified during shearing of these model materials. The fluctuations were demonstrated to reflect roughness of shear surfaces and variations in the driving force to accommodate this roughness. The Fast Fourier Transform (FFT) method was used to determine the dominant frequency bands and the amplitudes and wavelengths of the corresponding sine waves. These characteristic wave parameters were then linked to the shear strength parameters through the volumetric dilation rate, enabling determination of the friction coefficient of the system. It was demonstrated that the fluctuations are directly related to the intrinsic properties of soils and test conditions, and the current practice of averaging these fluctuations leads to the loss of valuable information. It is therefore suggested that residual strength of granular materials be presented in a way to recover and process this information.
Persistent Identifierhttp://hdl.handle.net/10722/173980
ISSN
2015 Impact Factor: 2.196
2015 SCImago Journal Rankings: 1.810
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Y-
dc.contributor.authorAydin, A-
dc.date.accessioned2012-11-06T07:24:49Z-
dc.date.available2012-11-06T07:24:49Z-
dc.date.issued2010-
dc.identifier.citationEngineering Geology, 2010, v. 115 n. 1-2, p. 96-104-
dc.identifier.issn0013-7952-
dc.identifier.urihttp://hdl.handle.net/10722/173980-
dc.description.abstractFluctuations of vertical displacement and shear stress are routinely observed during shear tests on granular materials. This study was designed to examine these fluctuations to gain insight into their shear behavior. Three distinct particle size mixtures of glass beads were tested by an intermediate direct shear apparatus at four normal stress levels and three shearing rates. Based on examination of the onset and nature of growth/decay patterns of the fluctuations, four distinct stages were identified during shearing of these model materials. The fluctuations were demonstrated to reflect roughness of shear surfaces and variations in the driving force to accommodate this roughness. The Fast Fourier Transform (FFT) method was used to determine the dominant frequency bands and the amplitudes and wavelengths of the corresponding sine waves. These characteristic wave parameters were then linked to the shear strength parameters through the volumetric dilation rate, enabling determination of the friction coefficient of the system. It was demonstrated that the fluctuations are directly related to the intrinsic properties of soils and test conditions, and the current practice of averaging these fluctuations leads to the loss of valuable information. It is therefore suggested that residual strength of granular materials be presented in a way to recover and process this information.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo-
dc.relation.ispartofEngineering Geology-
dc.subjectDirect shear-
dc.subjectGranular material-
dc.subjectStress fluctuation-
dc.subjectShear stress-
dc.subjectShear mode-
dc.subjectFFT-
dc.titleBehavior of rounded granular materials in direct shear: Mechanisms and quantification of fluctuationsen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y: li.dennis@hotmail.com-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.enggeo.2010.06.008-
dc.identifier.scopuseid_2-s2.0-77955771765-
dc.identifier.volume115-
dc.identifier.issue1-2-
dc.identifier.spage96-
dc.identifier.epage104-
dc.identifier.isiWOS:000281746600009-
dc.publisher.placeNetherlands-
dc.identifier.citeulike7397856-

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