A method is proposed to predict the behavior of single piles in cohesive soil subjected to vertical loads applied at various rates. The elementary simple shear model is made rate‐dependent by introducing the time raised to a negative power n. This viscous exponent n is shown to vary from 0.02–0.08 with a 0.05 average. Correlations with undrained shear strength, water content, plasticity, the liquidity index and overconsolidation ratio are shown based on 152 laboratory tests. Integration of the elementary model leads to rate‐dependent elastic‐plastic or hyperbolic load transfer curves. A program to predict the head load‐head movement response of the pile using these rate‐dependent load‐transfer curves is described. The validity of the method is first addressed by examining the physical reasons for the rate‐dependent properties of clays, then by using the results of 62 rate‐dependent pile load tests and by examining a series of applications of the new method and, finally, by presenting the results of a parametric study.
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Briaud et al. (1985) studied this question.
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