Results are presented from a series of static and cyclically load-triaxial compression tests performed on a soft, normally consolidated clay to study the effects of ocean wave induced stresses. Specimens were prepared in the laboratory by one-dimensional consolidation of a slurry mixture of kaolinite and water. Tests were performed under various combinations of sustained static and cyclic stress conditions employing unconsolidated-undrained (UU) testing procedures. Continuous cyclic loads were applied with a pulse form of sinusoidal shape in time. Frequencies of cyclic loading of 0.05 and 0.10 Hertz were used. Failure and reductions in strength were produced in specimens with no sustained stress within 500 cycles of load when the cyclic stress level exceeded approximately 75 percent of the conventional static strength of the specimens. Higher peak stress levels were required to produce failure when a sustained static stress was applied to specimens. Below a certain "critical" stress level cyclic loading produced an equilibrium, stiffened stress-strain response with no loss of strength due to the cyclic loading. Critical peak stress levels ranged from approximately 75 to 92 percent of conventional static strengths of specimens and were increased by increases in the sustained static stress. /Author/

Media Info

  • Features: Figures; References;
  • Pagination: p. 620-635

Subject/Index Terms

Filing Info

  • Accession Number: 00179771
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM