A NOTE ON THE PRINCIPLE OF THE MID-POINT CIRCLE

The application of the principle helps the phi equals 0 analysis of base failures of embankments and their structures by aiding the rapid determination of the location of the critical circular slip surface. The authors describe it application and outline its history, from the initial investigation of the Stigberg Quay failure in Gothenburg Harbour during 1916, showing how some investigators were unaware of the principle. In theory, the centre of the critical surface must lie vertically above the mid-point of the slope provided the undrained shear strength of the soft clay does not vary laterally. The principle of the mid-point circle is only for base failures and is not valid for slip surfaces, cutting through the slope. Although the principle applies to an embankment of anisotropic clay, it cannot be applied to effective stability analysis since there is always a lateral variation in strength. The principle can be extended to slopes of a complicated geometry and to the analysis of base failures of retaining structures. Examples are given for an embankment with berms, a sheet-pile wall and a concrete wall. (TRRL)

Media Info

  • Features: Figures; References;
  • Pagination: p. 123-125
  • Serial:
    • GEOTECHNIQUE
    • Volume: 34
    • Issue Number: 1
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00394579
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 31 1985 12:00AM