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Acta Geotechnica

, 1:59 | Cite as

Experimental evidence of a unique flow rule of non-cohesive soils under high-cyclic loading

  • T. WichtmannEmail author
  • A. Niemunis
  • Th. Triantafyllidis
Research Paper

Abstract

The presented results of cyclic triaxial tests on sand demonstrate that the cumulative effects due to small cycles obey a kind of flow rule. It mainly depends on the average stress ratio about which the cycles are performed. This so-called “cyclic flow rule” is unique and can be well approximated by flow rules for monotonic loading. Amongst others it is shown that the cyclic flow rule is only moderately influenced by the average mean pressure, by the strain loop (span, shape, polarization), the void ratio, the loading frequency, the static preloading and the grain size distribution curve. A slight increase of the compactive portion of the flow rule with increasing residual strain (due to the previous cycles) was observed. These experimental findings prove that the cyclic flow rule is an essential and indispensable concept in explicit (N-type) accumulation models.

Keywords

Cyclic flow rule Direction of strain accumulation Cyclic triaxial tests Sand 

Notes

Acknowledgements

This study was conducted as a part of the project A8 “Influence of the fabric change in soil on the lifetime of structures”, supported by the German Research Council (DFG) within the Collaborate Research Centre SFB 398 “Lifetime oriented design concepts”. The authors are indepted to DFG for the financial support.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • T. Wichtmann
    • 1
    Email author
  • A. Niemunis
    • 1
  • Th. Triantafyllidis
    • 1
  1. 1.Institute of Soil Mechanics and Foundation EngineeringRuhr-University BochumBochumGermany

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