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Quantitative assessment of the influence of surface roughness on soil stiffness.

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Title: Quantitative assessment of the influence of surface roughness on soil stiffness.
Authors: Ibraim, E., Sim, W. W., O'sullivan, C., Otsubo, M.
Source: Géotechnique. Aug2015, Vol. 65 Issue 8, p694-700. 7p.
Subjects: Surface roughness, Interferometers, Borosilicates, Stiffness (Engineering), Strains & stresses (Mechanics)
Abstract: The nature of soil stiffness at small strains remains poorly understood. The relationship between soil stiffness (e.g. shear stiffness, ) and isotropic confining pressure (′) can be described using a power function with exponent (), that is, = (′/ ), where is a constant and is an arbitrary reference pressure. Experimentally determined values of are usually around 0·5 and these are higher than the value of 0·33 that can be analytically determined using Hertzian theory. Hertzian theory considers contact between two smooth, elastic spheres; however, in reality, inter-particle contacts in soil are complex with particle shape and surface roughness affecting the interaction. Thus Hertzian theory is not directly applicable to predict real soil stiffness. It has, however, provided a useful basis to develop an analytical framework to consider the influence of particle surface roughness on small-strain soil stiffness. Here, earlier contributions using this framework are extended and improved by paying particular attention to roughness and the tangential contact stiffness. Stiffness values calculated using the newly derived analytical expressions were compared with the results of bender element tests on samples of borosilicate glass beads (ballotini) whose surface roughness was quantified using an optical interferometer. The analytical expression captures the experimentally observed sensitivity of the small-strain shear modulus to surface roughness. [ABSTRACT FROM AUTHOR]
Copyright of Géotechnique is the property of Thomas Telford Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 108544175
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  Data: Quantitative assessment of the influence of surface roughness on soil stiffness.
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  Data: <searchLink fieldCode="JN" term="%22Géotechnique%22">Géotechnique</searchLink>. Aug2015, Vol. 65 Issue 8, p694-700. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Surface+roughness%22">Surface roughness</searchLink><br /><searchLink fieldCode="DE" term="%22Interferometers%22">Interferometers</searchLink><br /><searchLink fieldCode="DE" term="%22Borosilicates%22">Borosilicates</searchLink><br /><searchLink fieldCode="DE" term="%22Stiffness+%28Engineering%29%22">Stiffness (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
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  Label: Abstract
  Group: Ab
  Data: The nature of soil stiffness at small strains remains poorly understood. The relationship between soil stiffness (e.g. shear stiffness, ) and isotropic confining pressure (′) can be described using a power function with exponent (), that is, = (′/ ), where is a constant and is an arbitrary reference pressure. Experimentally determined values of are usually around 0·5 and these are higher than the value of 0·33 that can be analytically determined using Hertzian theory. Hertzian theory considers contact between two smooth, elastic spheres; however, in reality, inter-particle contacts in soil are complex with particle shape and surface roughness affecting the interaction. Thus Hertzian theory is not directly applicable to predict real soil stiffness. It has, however, provided a useful basis to develop an analytical framework to consider the influence of particle surface roughness on small-strain soil stiffness. Here, earlier contributions using this framework are extended and improved by paying particular attention to roughness and the tangential contact stiffness. Stiffness values calculated using the newly derived analytical expressions were compared with the results of bender element tests on samples of borosilicate glass beads (ballotini) whose surface roughness was quantified using an optical interferometer. The analytical expression captures the experimentally observed sensitivity of the small-strain shear modulus to surface roughness. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Géotechnique is the property of Thomas Telford Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1680/geot.14.T.028
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 694
    Subjects:
      – SubjectFull: Surface roughness
        Type: general
      – SubjectFull: Interferometers
        Type: general
      – SubjectFull: Borosilicates
        Type: general
      – SubjectFull: Stiffness (Engineering)
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
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      – TitleFull: Quantitative assessment of the influence of surface roughness on soil stiffness.
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            NameFull: Sim, W. W.
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            NameFull: O'sullivan, C.
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              M: 08
              Text: Aug2015
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              Y: 2015
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