Cyclic Degradation of Pile Performance in Calcareous Soils

by H. G. Poulos, Univ of Sydney, Sch of Civil &, Mining Engineering, Sydney, Australia,

Document Type: Proceeding Paper

Part of: Analysis and Design of Pile Foundations


Laboratory data on the skin friction of jacked or driven model piles is presented. Significant cyclic degradation of skin friction commences when the cyclic displacement amplitude reaches the static displacement required to mobilize full skin friction. Other factors which influence cyclic degradation are the method of installation, relative density of the soil and the overconsolidation ratio. Using theoretical analysis, parametric solutions are obtained for the loss of ultimate shaft load capacity and stiffness of driven offshore piles subjected to cyclic loading.

Subject Headings: Load bearing capacity | Chemical degradation | Piles | Calcareous soils | Driven piles | Displacement (mechanics) | Ultimate loads | Soil-pile interaction

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