Geotechnical and Geological Engineering

, Volume 36, Issue 5, pp 3159–3171 | Cite as

Shear Modulus and Damping Ratio for Normally Consolidated Peat and Organic Clay in Hokkaido Area

  • Hirochika Hayashi
  • Takahiro Yamanashi
  • Hijiri Hashimoto
  • Masahiko Yamaki
Original paper


This paper presents that the shear modulus at small strain (G0) for peat and organic clay in normally consolidated state, as well as the strain dependence of the shear modulus and the damping ratio (dynamic property). In analyzing dynamic ground behavior, G0 and dynamic property of soils should be accurately determined. Therefore, eight types of peat and two types of organic clay, which were all different in terms of engineering property, were given a series of cyclic torsional shear tests in the normally consolidated state, to clarify effects of physical properties of the soils and effective confining pressure on G0 and dynamic properties. Finally, based on the test results, empirical equations to determine G0 and dynamic property of peat and organic clay are proposed.


Shear modulus at small strain Dynamic property Peat Organic clay Normal consolidation Cyclic torsional shear test Formulation 


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Hirochika Hayashi
    • 1
  • Takahiro Yamanashi
    • 1
  • Hijiri Hashimoto
    • 1
  • Masahiko Yamaki
    • 2
  1. 1.Civil Engineering Research Institute for Cold Region (CERI)SapporoJapan
  2. 2.Rumoi Branch of Hokkaido Regional Development BureauRumoiJapan

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