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http://dx.doi.org/10.7843/kgs.2017.33.2.17

Evaluation of Permanent Lateral Displacement of a Cyclic Laterally Loaded Pile in Sandy Soil  

Baek, Sung-Ha (Dept. of Civil & Environmental Engrg., Seoul National Univ.)
Kim, Joon-Young (Eng. Research Institute, Seoul National Univ.)
Lee, Seung-Hwan (Eng. Research Institute, Seoul National Univ.)
Chung, Choong-Ki (Dept. of Civil & Environmental Engrg., Seoul National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.2, 2017 , pp. 17-26 More about this Journal
Abstract
Pile foundations that support offshore structures or transmission towers are dominantly subjected to cyclic lateral loads due to wind and waves, causing permanent displacement which can severely affect stability of the structures. In this study, a series of cyclic lateral load tests were conducted on a pre-installed aluminum flexible pile in sandy soil with three different relative densities (40%, 70% and 90%) in order to evaluate the permanent displacement of a cyclic laterally loaded pile. Test results showed that the cyclic lateral loads accumulated the irreversible lateral displacement, so-called permanent displacement. As the number of cyclic lateral load increased, accumulated permanent displacement increased, but the permanent displacement due to one loading cycle gradually decreased. In addition, the permanent displacement of a pile increased with decrement of relative density and decreased by soil saturation. From the test results, the normalized permanent displacement defined as the cumulative permanent displacement to the initial permanent displacement ratio was investigated, and empirical equations for predicting the normalized permanent displacement was developed in terms of relative density of the soil and the number of cyclic lateral load.
Keywords
Pile foundation; Model pile test; Cyclic lateral load; Permanent lateral displacement; Relative density;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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