THE STABILITY OF SLENDER PILES DURING DRIVING

This discussion relates to a paper reporting on an initial study of the directional stability of such piles. The original paper by Burgess, IW, appeared in Geotechnique 1976-06, vol 26, no 2. For abstract of this paper, see IRRD abstract no 221660. Several examples of stability limits for steel pile sections in cohesive soil were presented, and it was shown that, even allowing for the simplifying assumptions, that directional instability can be a problem within the working ranges of many practical piles. The contributor to the discussion considers that the author ignored such important factors such as initial out-of-straightness of the pile, and consideration of whether the soil hardens or softens during deformation. The contributor describes his own research work on the same problem, and the use of well established procedures that avoid the need to establish potential functions which in non-conservative systems are considered far from easy to justify. Equations are derived and information presented on piles (considered initially straight) driven into sand, soft clay and hard clay. Stability charts are presented and discussed. In reply the author discusses the observations and analysis presented by the contributor, and indicates that since the whole subject of directional stability of piles is at a very early stage, the problem considered was a very simple representation of reality. Thus the variation of soil properties with depth was deliberately omitted from the analysis. /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: p. 234-24
  • Serial:
    • GEOTECHNIQUE
    • Volume: 28
    • Issue Number: 2
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00183416
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1978 12:00AM