loading rate effect on piles in clay from laboratory
abdullah i. ai-mhaidib
department of civil engineering. king saud university, p. o. box 800,
riyadh 11421, saudi arabia
(Received 05/7/1999; accepted for publication 18/12/1999 )
The strength of cohesive soils is affected by the rate at which the external load is applied. Bearing
capacity of foundations is also affected by the rate of loading since it is a function of the shear strength of
soils. In this study, the influence of loading rate on the axial capacity of piles in clay is experimentally
investigated. Two series of model tests were carried out using a steel model pile having a diameter of 3D mm
under different loading rates. The first group of tests was performed under axial compression loads, while the
model pile was subjected to axial uplift loads in the second set of tests. In addition, consolidated undrained
triaxial tests were perfonned under the same loading rates used in the axial capacity tests. Compressive and
uplift axial capacities of the model pile were found to increase as the loading rate increases. The relationship
between time to failure, and both the undrained shear strength of the clay and the axial capacity of the model
pile can be represented by a straight line on a log-log plot.
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