Impacts of reference strain rate and strain level dependency on rate effects in fine grained soils

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Abstract

Viscous rate effects in fine-grained soils may occur in many engineering applications (e.g. dynamically penetrated anchors, sampling, rapid load testing of piles or high-speed soil characterisation), where high strain rates are induced during shear. Often it is difficult to correct for this enhancement of soil strength as fundamental understanding and quantification of rate effects is an area where further research is required. This is at least in part due to limitations of soil characterisation equipment and instrumentation. With the aim of tackling some of these issues a high-speed triaxial testing system was developed incorporating lubricated end platens, which was used to test kaolin at strain rates from 0·1 to 180 000%/h. This allowed observation of behaviour from fully drained, partially drained and undrained conditions, through to viscous effects. Results were used to investigate how rate effects are influenced by strain and consolidation level and how rate normalisation parameters are affected. This was then used to improve a commonly adopted rate characterisation approach such that it performed better across a wider range of strain rates and can be used for more consistent evaluation of rate effects between studies.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalGeotechnique Letters
Volume13
Issue number1
Early online date11 Jan 2023
DOIs
Publication statusPublished - Mar 2023

Keywords

  • Rate effects
  • Strain rate
  • Clay
  • rate effects
  • clays
  • Geotechnical engineering
  • laboratory tests
  • geotechnical engineering

ASJC Scopus subject areas

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

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  • Pile capacity testing

    Brown, M., Ball, J., Burland, J., Chapman, T., Higgins, K., Skinner, H. & Toll, D., 10 Nov 2023, ICE Manual of Geotechnical Engineering, Second edition, Volume II: Geotechnical design, construction and verification. Brown, M., Burland, J., Chapman, T., Higgins, K., Skinner, H. & Toll, D. (eds.). 2nd ed. UK: Emerald Group Publishing Limited, Vol. 2. p. 1599-1620 22 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

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  • Design methods based upon rapid load tests

    Brown, M., Apr 2016, Proceedings of the ISSMGE - ETC 3 International Symposium: Design of Piles in Europe: How did Eurocode 7 change daily practice? . Belgium Building Research Institute , p. 97-104 8 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Open Access
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  • Rate effects at varying strain levels in fine grained soils

    Robinson, S. & Brown, M. J., 2013, 18th International Conference on Soil Mechanics and Geotechnical Engineering: Challenges and Innovations in Geotechnics, ICSMGE 2013. 2013 ed. IOS Press, Vol. 1. p. 263-266 4 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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