THE PLASTIC DEFORMATION OF A SILTY CLAY UNDER CREEP AND REPEATED LOADING

Previous investigations have indicated a similarity in the behaviour of clay under repeated loading compared with that under creep loading. A series of triaxial tests, using both these loading regimes, was carried out on reconstituted samples of a silty clay in order to quantify this similarity in terms of the relationship between stress and plastic strain. The samples were consolidated isotropically in the triaxial cell and brought to various overconsolidation ratios between 4 and 10. Undrained creep and repeated load tests were carried out using servo-hydraulic test equipment. The repeated load tests involved sinusoidal variation of deviator stress at a frequency of 10 hz and constant confining stress. The development of plastic strain and mean pore-pressure in both types of test was shown to be similar. The results were expressed in terms of plastic strain rate as a function of time, applied deviator stress and stress history. The sinusoidal stress pulse was approximated by A step function which allowed the creep test results to be used to successfully predict the behaviour under repeated loading. Further tests indicated that short rest periods between trains of deviator stress pulses did not affect the development of plastic shear strain.(a) /TRRL/

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 173-184
  • Serial:
    • GEOTECHNIQUE
    • Volume: 26
    • Issue Number: 1
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00138847
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 26 1976 12:00AM