Downdrag on a three-pile group of pipe poles/ Frottement negatif d'un groupe de trois pieux cylindriques

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ConferenceProc. 11th Int. Conf. on Soil Mechanics and Foundation Engineering/ C.R. 11e congres int. de mecanique des sols et des travaux de foudations: 12 August 1985, San Francisco, California, USA
Pages14071412; # of pages: 6
Subjectbridges; piles; loads; granular test embankement; 6 1/2 years observation; compressible clayey silt deposit; soil vertical effective stress; pullout failure load
AbstractThe 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
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number25878
NPARC number20378434
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Record identifier7c69fa93-e456-4717-b5ca-851499d9a047
Record created2012-07-24
Record modified2016-05-09
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