Lateral Load-Deflection Prediction for Pile Groups

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

Serial Information: Journal of the Geotechnical Engineering Division, 1975, Vol. 101, Issue 1, Pg. 19-34

Document Type: Journal Paper


A simple method of predicting the load-deflection behavior of a laterally loaded pile group is developed by combining a non linear load-deflection analysis for a single pile with an elastic analysis of pile groups. The parameters most influencing the prediction are the soil modulus and the ultimate lateral load of a pile in the group, Hu. The soil modulus may be backfigured from a lateral load test on a single pile and a method of interpretation of the test is described. The lateral load capacity of an isolated single pile also may be estimated and by multiplying this value by a lateral group efficiency factor, Hur may be determined. A number of comparisons between the observed and predicted load-deflection behavior of model pile groups, show good agreement and suggest that the proposed method is capable of providing satisfactory load-deflection predictions for laterally loaded pile groups, provided appropriate values of soil modulus and Hur can be input into the analysis.

Subject Headings: Soil modulus | Load factors | Load tests | Load bearing capacity | Elastic analysis | Lateral loads | Displacement (mechanics) | Pile groups

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