Behavior of Laterally Loaded Piles: II-Pile Groups

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

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1971, Vol. 97, Issue 5, Pg. 733-751

Document Type: Journal Paper


An elastic analysis is presented for the horizontal displacement and rotation of a laterally loaded pile group and the distribution of horizontal forces within the group. The interaction between two identical equally loaded piles is analyzed first, and the increases in displacement and rotation of the piles, in relation to the single pile values, are expressed in terms of interaction factors. Using these interaction factors, a method for calculating the displacement and rotation of a general pile group, based on the principle of superposition, is described. An examination of the behavior of square groups of piles reveals that the displacement, rotation, and load distribution in the group is largely influenced by the length-to-diameter ratio of the piles and the relative pile flexibility. It is also found that the displacement depends on the breadth of the group rather than the number of piles in the group. A reasonable measure of agreement is found between a limited number of reported measurements and theoretical predictions of group displacements.

Subject Headings: Displacement (mechanics) | Lateral loads | Piles | Rotation | Load distribution | Load factors | Pile groups | Elastic analysis

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