NEGATIVE SKIN FRICTION ON PILES

Methods for computing skin friction are presented, and a method for estimating the location of the neutral point is described. Nine methods for estimating negative skin friction were reviewed in 2 steps: theory, assumptions, and equations were evaluated for ease of application in the field and ease of determining the required soil parameters from laboratory tests; the results predicted by each method were compared with field measurements. The methods of Terzaghi and Peck and Garlonger which gave reasonable values, are detailed here. An approximate method based on statics is also presented. Estimating the location of the neutral point requires a comparison of the relative displacement of pile and soil. The soil displacement can be computed by the usual techniques for compressive forces. Three effective methods for reducing the negative skin friction on a pile and for a more economical design are: bitumen coated steel piles surrounded by bentonite slurry; concrete pile surrounded by bentonite; and electro-osmosis.

  • Supplemental Notes:
    • This research was sponsored by the Joint Highway Research Advisory Council of the University of Connecticut and the Connecticut Department of Transportation.
  • Corporate Authors:

    University of Connecticut, Storrs

    Institute of Water Resources
    Storrs, CT  United States 
  • Authors:
    • Long, R P
    • Healy, K A
  • Publication Date: 1974-3

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00152353
  • Record Type: Publication
  • Report/Paper Numbers: JHR 74-77 Final Rpt.
  • Files: TRIS
  • Created Date: Aug 15 1977 12:00AM