RELATIONSHIPS BETWEEN STABILITY ANALYSES WITH TOTAL AND WITH EFFECTIVE STRESSES

A brief description is given of the phi = 0-analysis as well as the C phi - analysis, and three possible modes of failure are identified: undrained failure at end of construction under maximum load, drained failure after consolidation under a smaller constant load, or undrained failure after consolidation caused by a quick load increase (CU-failure). The reliability is shown of the phi = 0-analysis when applied to the end of construction stability of structures made on or in evenly (horizontal) consolidated clay deposits. For the stability of natural clay slopes, this analysis is not reliable. A theoretical formula is developed for the vane strength. An approximate formula is developed for the ground strength by means of which it is possible to correct the "apparent" safety factor found by an ordinary vane analysis. The general case is considered, in which a structure is made or loaded on an unevenly consolidated clay deposit. Provided that the soil properties have been measured shortly before the considered construction or increased loading takes place, it is shown that the safety against a short-term CU-failure can be calculated from a formula, in which the safety factors by ordinary vane analysis for maximum and consolidating load respectively occur. The calculation of the safety against a long-term CU-failure is outlined in which a C phi - analysis must be made. The latter analysis based on actual pore pressure measurement is considered the most reliable.

  • Corporate Authors:

    Editions Sols-Soils

    54 Avenue de la Motter-Picquet
    Paris 16e,   France 
  • Authors:
    • Hansen, J B
  • Publication Date: 1962-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 28-39
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00081581
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 19 1975 12:00AM