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Clay hypoplasticity coupled with small-strain approaches for complex cyclic loading.

Gertraud Medicus1, Merita Tafili1,2, Manuel Bode1

  • 1Universität Innsbruck, Austria, Computational and Experimental Soil Mechanics, Unit of Geotechnical Engineering, Technikerstr. 13, 6020 Innsbruck, Austria.

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Summary
This summary is machine-generated.

This study enhances clay hypoplasticity models to better predict cyclic soil behavior in offshore foundations and railway embankments. The improved model shows promise but limitations remain in preventing overshooting effects during cyclic loading.

Keywords:
ClayCyclic loadingHypoplasticityISAIntergranular strainSmall-strain stiffness

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Area of Science:

  • Geotechnical Engineering
  • Computational Mechanics
  • Soil Mechanics

Background:

  • Accurate prediction of cyclic soil behavior is vital for offshore foundation and railway embankment design.
  • Basic hypoplastic models struggle with small-strain stiffness and cyclic loading due to their state variable approach.

Purpose of the Study:

  • To extend clay hypoplasticity with a modified intergranular strain.
  • To compare the new model against a previously coupled ISA model.
  • To evaluate predictive capabilities using monotonic and cyclic tests.

Main Methods:

  • Incorporation of a modified intergranular strain into clay hypoplasticity.
  • Comparison of model performance under various cyclic loading paths.
  • Validation through simulations of monotonic and cyclic tests on Lower Rhine clay.

Main Results:

  • Both models predict reduced strain accumulation with increased cycles.
  • Overshooting and undershooting effects were observed in both models under specific conditions.
  • A yield surface in strain space was insufficient to eliminate these effects.

Conclusions:

  • The enhanced hypoplasticity model shows potential for predicting cyclic soil behavior.
  • Limitations persist, particularly concerning overshooting effects, even with yield surfaces.
  • Further refinement is needed for comprehensive cyclic behavior prediction in geotechnical applications.