BEHAVIOR OF EMBANKMENTS ON NEW LISKEARD VARVED CLAY

The performance of two embankments, one of which failed, in New Liskeard, Canada is analyzed. The underlying 150 feet of medium to soft varved clay is studied with respect to stability, undrained deformations, pore pressure distribution, and consolidation settlements. Emphasis is placed upon comparisons of calculated versus measured field behavior. Total stress stability analyses using average field vane strengths and average UU and UC strengths both yielded satisfactory factors of safety and critical arcs. Some analyses using anisotropic undrained strengths were also made. Effective stress stability analyses gave factors of safety that were too high by 20 plus or minus 5 percent. Undrained deformations and excess pore pressures predicted with the finite element program FEECON were generally very consistent with field measurements for an instrumented embankment located 200 feet from the failure area. The presence of cementing bonds in the New Liskeard varved clay limits extrapolation of the properties and behavior of this clay to other sites that are not naturally cemented. /AUTHOR/

  • Supplemental Notes:
    • Prepared in cooperation with the U.S. Department of Transportation. Sponsored by the Commonwealth of Massachusettes Department of Public Works.
  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139
  • Authors:
    • Lacasse, S M
    • Ladd, C C
  • Publication Date: 1973-9

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: 270 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00263745
  • Record Type: Publication
  • Report/Paper Numbers: R73-44 Intrm Rpt
  • Contract Numbers: R23-0
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM