Behavior of a gulf of mexico clay under variable-strain cyclic loads

V. Taukoor, S. M. Olson, C. J. Rutherford

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

Abstract

To better understand the influence of variable-strain time histories on the cyclic and post-cyclic behavior of offshore soft clays, nine undrained triaxial tests were performed on a Gulf of Mexico clay. The specimens were subjected to strain-controlled cyclic loading, immediately followed by undrained monotonic compression loading. The specimens were consolidated to overconsolidation ratios of 1, 2, and 3. Three combinations of cyclic strain amplitudes were investigated, namely “ramp up” (cyclic axial strain εc =0.5→1→1.5→2.0→2.5→3%), “ramp down” (εc = 3→2.5→2.0→1.5→1→ 0.5%) and “ramp up and down” (εc = 0.5→1.5→3→1.5→0.5%). The results illustrate that both the sequence of cyclic loads and specimen OCR affected the normalized cyclic shearing resistance and shear modulus degradation, but had a lesser effect on the cyclic load-induced normalized excess pore pressure. All the tests followed a dilative stress path during post-cyclic monotonic loading and reached the same Mohr-Coulomb failure envelope defined from monotonic undrained triaxial tests.

Original languageEnglish (US)
Title of host publicationEarthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019
EditorsFrancesco Silvestri, Nicola Moraci
PublisherCRC Press/Balkema
Pages5257-5264
Number of pages8
ISBN (Print)9780367143282
StatePublished - Jan 1 2019
Event7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019 - Rome, Italy
Duration: Jan 17 2019Jan 20 2019

Publication series

NameEarthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019

Conference

Conference7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019
CountryItaly
CityRome
Period1/17/191/20/19

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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  • Cite this

    Taukoor, V., Olson, S. M., & Rutherford, C. J. (2019). Behavior of a gulf of mexico clay under variable-strain cyclic loads. In F. Silvestri, & N. Moraci (Eds.), Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019 (pp. 5257-5264). (Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019). CRC Press/Balkema.