Cyclic degradation and non-coaxiality of soft clay subjected to pure rotation of principal stress directions

Jian Gu Qian, Zi Bo Du, Zhen Yu Yin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)


Foundation soils are often under non-proportional cyclic loadings. The deformation behaviour and the mechanism of non-coaxiality under continuous pure principal stress rotation for clays are not clearly investigated up to now. In order to study the effect of pure principal stress rotation, a series of cyclic undrained tests on Shanghai soft clay subjected to cyclic rotation of principal stress directions keeping the deviatoric stress constant under the pure rotation condition were conducted using hollow cylinder apparatus. Based on this, the evolutions of excess pore pressure and strains during cyclic loading were investigated, together with the effects of the intermediate principal stress parameter and the deviatoric stress level on stress–strain stiffness and non-coaxiality. The result can provide an experimental basis for constitutive modelling of clays describing the behaviour under non-proportional loadings.

Original languageEnglish
Pages (from-to)943-959
Number of pages17
JournalActa Geotechnica
Issue number4
Publication statusPublished - 1 Aug 2018
Externally publishedYes


  • Anisotropy
  • Clay
  • Cyclic loading
  • Intermediate principal stress
  • Non-coaxiality
  • Principal stress rotation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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