Post-Cyclic Behavior of a Gulf of Mexico Clay

Vashish Taukoor, Cassandra J Rutherford, Scott M. Olson

Research output: Contribution to journalConference articlepeer-review


Offshore soft clays commonly exhibit changes in monotonic behavior following cyclic loading events. To better understand the shear strength of soft clays after a cyclic event, the authors performed a series of strain-controlled undrained cyclic triaxial compression tests followed by undrained monotonic compression to failure on a Gulf of Mexico clay. Prior to cycling, specimen overconsolidation ratios ranged from 1 to 3. Cyclic strain amplitudes of 0.5%, 1%, 2%, and 3% were used for the initial loading phase which consisted of 300 cycles at a frequency of 0.5 Hz. The monotonic behavior after cyclic loading generally exhibited: (1) a dilative response (compared to contractive response for monotonic undrained compression tests); (2) a reduction in maximum shear modulus; and (3) a decrease in post-cyclic undrained shear strength of about 25% compared to the virgin undrained shear strength. Despite these differences in response, all post-cyclic stress paths reached the same effective stress failure envelope defined by monotonic undrained compression tests on virgin specimens.

Original languageEnglish (US)
Pages (from-to)345-356
Number of pages12
JournalGeotechnical Special Publication
Issue numberGSP 293
StatePublished - 2018
Event5th Geotechnical Earthquake Engineering and Soil Dynamics Conference: Slope Stability and Landslides, Laboratory Testing, and In Situ Testing, GEESDV 2018 - Austin, United States
Duration: Jun 10 2018Jun 13 2018

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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