YIELDING AND PLASTIC BEHAVIOUR OF AN UNSATURATED COMPACTED SILT

Several yield criteria were considered, depending on the type of test performed. Some similarities between compacted unsaturated soils and natural soft soils were shown, such as the inclined elliptical form of the yield curve, which results from the anisotropic state of stress prevailing during K0 compaction. Some preconsolidation effects due to increasing suction were identified, and an approximately isotropic suction hardening phenomenon was evidenced, together with a non-associated flow rule. The direction of the plastic strain increment seemed almost independent of the suction, and a hyperbolic plastic potential, similar to that of sand, was found satisfactory. Inclined ellipses were chosen for modelling the yield curves. As for any simple elasto-plastic Cam clay type model applied to overconsolidated soils, the predicted stress-strain curves showed a sudden transition at yield, whereas a much more gradual transition was observed in practice. Volume change prediction appeared satisfactory, showing the validity of the hyperbolic plastic potential. (A)

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Authors:
    • Cui, Y J
    • DELAGE, P
  • Publication Date: 1996-6

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 291-311
  • Serial:
    • GEOTECHNIQUE
    • Volume: 46
    • Issue Number: 2
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00726640
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 28 1996 12:00AM