CHANGE IN PILE CAPACITY WITH TIME: CASE HISTORIES

Four case histories where important changes in pile capacity were observed with time are presented. Two show an increase of pile capacity for shaft bearing piles driven into deep sand deposits. The increase occurred over a period longer than needed for pore pressure dissipation. In one case, increases of 33 and 85% in pile capacity were measured 2 and 51 days, respectively, after pile driving. The other two case histories deal with the decrease of pile capacity of close-toe pipe piles driven to shale bedrock. The decrease, determined using dynamic monitoring during initial driving and at restriking a few days later, ranged from 11 to 25%. It is concluded that restriking should be currently practiced on all construction sites to investigate any change in pile capacity after driving. This procedure is particularly recommended for toe bearing piles on shale bedrock.

• Corporate Authors:

  National Research Council of Canada

  1200 Montreal Road
  Ottawa, Ontario  Canada  K1A 0R6
• Authors:
  • SAMSON, L
  • Authier, J
• Publication Date: 1986-5

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 174-180
• Serial:
  • CANADIAN GEOTECHNICAL JOURNAL
  • Volume: 23
  • Issue Number: 2
  • Publisher: National Research Council of Canada

Subject/Index Terms

• TRT Terms: Case studies; Sand; Shafts (Machinery); Shale; Toes
• Uncontrolled Terms: Change
• Old TRIS Terms: Pile bearing capacities
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00459212
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 31 1986 12:00AM