The problems are discussed in insuring that the shear strength is representative of the in-situ shear strength, that the subsoil profile is an accurate reflection of the stiff and weak layers that exist in the ground, and that other important parameters such as porewater pressure are accurately known. The success of the circular method in its various forms may best be evaluated through studies of actual slope failures. If the measured shear strength is correct, the compiled safety factor should be 1.0. Case histories of failures show that the computed safety factors of slope railures are generally close to 1. The results of further cases of failure are also discussed. To evaluate the reliability of a particular test, stress conditions in the test relative to those in the field must be examined. The influence of the uncertainity associated with the knowledge of subsoil conditions is a major factor. This aspect is illustrated by an example. The problem is also discussed (and illustrated by an example) of the prediction of in-situ strength of a proposed excavation before a slickerside surface has developed. Further examples serve to illustrate various complications in natural laws that may not presently be analyzed with confidence.

  • Supplemental Notes:
    • Proceedings of the Ohio River Valley Soils seminar held October 5, 1973. This conference was sponsored, by the Kentucky soil Mechanics and Foundations Group of the American Society of Civil Engineers.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Wu, T H
  • Publication Date: 1974-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00097157
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 10 1975 12:00AM