Group Factors for Pile-Deflection Estimation

by Harry G. Poulos, (M.ASCE), Reader in Civ. Engrg.; Univ. of Sydney, Sydney, Australia,

Serial Information: Journal of the Geotechnical Engineering Division, 1979, Vol. 105, Issue 12, Pg. 1489-1509

Document Type: Journal Paper


A series of solutions is presented for group settlement, lateral deflection and rotation ratios, for a variety of pile-group configurations, spacings, and stiffnesses and for both a homogeneous soil and a soil when modulus increases linearly with depth. These solutions have been obtained from an elastic analysis and may be applied to the appropriate single-pile deflections to obtain the group response. Some typical solutions are presented to indicate the effects of pile-head condition and pile batter on the group factors, and then an illustrative example is given to demonstrate the use of the solutions for a practical problem.

Subject Headings: Soil settlement | Soil modulus | Piles | Displacement (mechanics) | Elastic analysis | Pile settlement | Rotation | Pile groups

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