MEASUREMENT OF PILE DOWNDRAG BENEATH A BRIDGE ABUTMENT

Steel H piles for a bridge abutment were driven through 25 ft (7.6 m) of fill, 13 ft (4.0 m) of sand, and 50 ft (15.2 m) of soft clay into a dense glacial till. Seventeen years after the bridge was completed, the differential settlement between the bridge deck and the approach fill had exceeded 18 in. (46 cm). To determine the amount of downdrag loading carried by the piles, which were designed to carry a total loading of 60 tons (530 kN) per pile, measurements of strain and movement were made at the top of one of the piles as the pile was cut free from the abutment and as the skin friction forces were removed through a combination of excavation and electro-osmosis. The measured vertical load and moment at the top of the pile were 114 tons (1015 kN) and 1,140 in.-kips (130 kN-m), respectively. The total vertical load at the top of the glacial till, back-figured from the movement at the top of the pile, was 230 tons (2050 kN), indicating over 100 tons (890 kN) pf pile downdrag.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 61-69
  • Monograph Title: PERFORMANCE OF EARTH RETAINING STRUCTURES AND PILE FOUNDATIONS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00084127
  • Record Type: Publication
  • ISBN: 0309023610
  • Files: TRIS, TRB
  • Created Date: Apr 22 1975 12:00AM