Downdrag Forces in Group of Piles
Publication: Journal of Geotechnical Engineering
Volume 115, Issue 6
Abstract
This paper describes a boundary element analysis for analyzing the behavior of a group of end‐bearing piles subjected to negative friction. It is found that group effects lead to a reduction in downdrag force in a pile, as compared with a single isolated pile, and that inner piles in a group develop less downdrag force than the outer piles. Among the factors influencing the distribution of downdrag force in the group are the number of piles, the relative stiffness of the piles, the distribution of soil modulus with depth, and the presence of pile‐soil slip. A significantly larger soil surface settlement is required to mobilize full pile‐soil slip along all piles in the group than along a single pile. When applied to a published field test, the theory shows reasonable agreement with the measured behavior.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Endo, M. (1969). “Pipe piles—Report by the Research Committee for Pipe piles—Chapter 5, negative friction.” Japanese Soc. Soil Mech. and Found. Engrg., Tokyo, Japan, 257–316 (in Japanese).
2.
Koerner, R. M., and Mukhopadhyay, C. (1972). “Behavior of negative skin friction on model piles in medium‐plasticity silt.” High. Res. Rec., 405, 34–44.
3.
Okabe, T. (1973). “Report of measured negative friction on double pipe piles and pile group.” Rept. C‐0261, Japan Nat. Railway (in Japanese).
4.
Poulos, H. G. (1968). “Analysis of the settlement of pile group.” Geotechnique, 18(4), 449–471.
5.
Poulos, H. G., and Davis, E. H. (1975). “Prediction of downdrag forces in endbearing piles.” J. Geotech. Engrg., ASCE, 101(2), 189–204.
6.
Poulos, H. G. (1979). “Settlement of single piles in nonhomogeneous soil.” J. Geot. Engrg., ASCE, 105(5), 627–641.
7.
Poulos, H. G., and Davis, E. H. (1980). Pile foundation analysis and design. John Wiley and Sons, Inc., New York, N.Y., 265–293.
Information & Authors
Information
Published In
Copyright
Copyright © 1989 ASCE.
History
Published online: Jun 1, 1989
Published in print: Jun 1989
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.