THE RELIEF OF NEGATIVE SKIN FRICTION ON PILES BY ELECTRO- OSMOSIS

The paper describes a method of analysing the magnitude and rate of reduction of negative skin friction on piles. The method combines a pile-soil interaction analysis (based on elastic theory) with a diffusion analysis for pore water flow under an electrical gradient. The method has been applied to predict the behaviour of a pile subjected to electro-osmosis in two cases: (I) a full-scale field trial carried out in Boston some years ago in which one pile in a group supporting a bridge abutment was cut, released from the pile cap and then subjected to electro-osmosis. "class a" predictions were made of the pile deflection at various stages in the trial, and comparisons are described between the predictions and the measurements. (II) a laboratory model test, in which negative friction has been induced in a pile by consolidation of the surrounding soil and then brief periods of electro-osmotic treatment have been applied to the pile. Prediction of the downdrag load versus time relationship are compared with the observed relationships (A). (TRRL)

• Corporate Authors:

  University of Sydney

  School of Civil Engineering, Parramatta Road
  Sydney, New South Wales  Australia  2006
• Authors:
  • Davis, E H
  • POULOS, H G
• Publication Date: 1980-5

Media Info

• Features: Figures; References; Tables;
• Pagination: 30 p.

Subject/Index Terms

• TRT Terms: Bridge abutments; Deflection; Electroosmosis; Field tests; Forecasting; Friction; Laboratories; Measurement; Methodology; Pore water; Skin resistance; Soil mechanics; Soils; Support piles; Tests
• Uncontrolled Terms: Decreases
• Old TRIS Terms: Pile behavior
• ITRD Terms: 9009: Decrease; 5785: Electroosmosis; 5452: Friction; 6226: In situ; 6237: Laboratory (not an organization); 9102: Method; 3399: Pile; 4156: Soil; 6255: Test
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00325314
• Record Type: Publication
• Source Agency: ARRB
• Report/Paper Numbers: Res Rpt. No. R 367
• Files: ITRD, TRIS
• Created Date: May 21 1981 12:00AM