Dilative behavior of kaolinite under drained creep condition

Dan Zhao, Mahdia Hattab, Zhen Yu Yin, Pierre Yves Hicher

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


This paper studies the dilative behavior of clay during drained creep along triaxial tests under constant mean effective stress, where the volumetric strain is caused by the sole deviatoric stress variation. Tests were conducted on a saturated reconstituted clayey material by the use of a GDS stress path control apparatus. The development of the axial and volumetric strains was studied with respect to time, stress level (SL) and overconsolidation ratio (OCR). Analysis of the results ascertained that both dilatancy and contractancy phenomena could occur during creep. The magnitude of the dilatancy/contractancy during creep was guided by the test conditions (SL and OCR), which specifically governed the direction of the volumetric strain variations. The position of the stress level vis-à-vis the different volumetric domains defined by monotonic triaxial tests in the (p′–q) plane controls the evolution of the volumetric creep strain. The failure of an overconsolidated specimen could be observed for a stress level located under the maximum strength envelope, but above the critical state line in the p′–q plane, accompanied by a significant dilative behavior during creep.

Original languageEnglish
Pages (from-to)1003-1019
Number of pages17
JournalActa Geotechnica
Issue number4
Publication statusPublished - 1 Aug 2019


  • Clay
  • Dilatancy
  • Drained creep
  • Overconsolidation ratio
  • Triaxial tests

ASJC Scopus subject areas

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


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