STRAIN RATE AND PRESHEAR EFFECTS IN CYCLIC RESISTANCE OF SOFT CLAY

The authors conducted cyclic constant-volume direct simple shear tests on intact specimens of a sensitive clay reconsolidated to the in-situ stress state resulting in an overconsolidation ratio of 2.2. The tests were conducted for different values of initial static undrained shear stress. Results confirmed that high strain rate associated with cyclic loading has a significant influence on the cyclic resistance of soft clays. The strain-rate effect fully compensates the degradation of shear strength associated with cycling for up to 12 cycles. The presence of initial static shear stress reduces the cyclic resistance but increases the total undrained shear resistance, because of partial or total disappearance of stress and strain reversal. Findings suggest that for such a clay, the static undrained shear strength provides a conservative estimate in a pseudostatic analysis.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 21-26
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00716442
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 8 1996 12:00AM