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Downdrag on a three-pile group of pipe poles

From National Research Council Canada

Alternative titleFrottement négatif d'un groupe de trois pieux cylindriques
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Affiliation
  1. National Research Council of Canada
FormatText, Article
Conference11th International Conference on Soil Mechanics and Foundation Engineering, August 12, 1985, San Francisco, California, United States
Subjectbridges; piles; loads; granular test embankement; 6 1/2 years observation; compressible clayey silt deposit; soil vertical effective stress; pullout failure load
Abstract
The development of downdrag load on a group of three piles spaced at four pile diameters was observed for 6 1/2 years. The 32 m long, 324 mm diameter piles were driven through a granular test embankment onto a deep deposit of compressible clayey silt. There was no group effect on the development of load. The maximum was 1000 kN in 1 1/2 years, and 900 kN after 6 1/2 years due to changes in embankment loading. The distribution of downdrag loads on the piles for various conditions of vertical effective stress in the soil was adequately estimated with effective stress equations using K 0 obtained from a field pullout test and the coefficient of friction between the soil and pile from laboratory tests. The pullout failure load was equivalent to the downdrag and positive skin friction load.
Publication date
In
  • Proceedings of the 11th International Conference on Soil Mechanics and Foundation Engineering, August 12, 1985, San Francisco, California, United States 3 (1985): 1407–1412.
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-1370
NRC numberNRCC 25878
NRC-IRC-1434
NPARC number20378434
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Record identifier7c69fa93-e456-4717-b5ca-851499d9a047
Record created2012-07-24
Record modified2024-05-10
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