An analytical method for developing a theoretical load-settlement curve for axially loaded piles in clay is presented. The method is based on the correlation of the ratio of load transfer to soil shear strength as a function of pile movement. The results of studies of field tests of instrumented piles and laboratory tests of small piles in clay are used to obtain the desired correlation. The correlation is presented in the form of a family of curves that are obtained when the ratios of load transfer to soil shear strength versus pile movement are plotted as a function of depth. The validity of the family of correlation curves is checked by comparing computed and actual load-settlement curves for some typical field tests. Results obtained by this method indicate that the method may be used effectively to determine load-carrying capacity for axially loaded piles in clay.

Closure to “Load Transfer for Axially Loaded Piles in Clay”

Analytical solution for longitudinal vibration of a floating pile in saturated porous media based on a fictitious saturated soil pile model

A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects

Torsional dynamic response of a pile embedded in layered soil based on the fictitious soil pile model

The apparent phase velocity of open-ended pipe piles after installation is difficult to predict owing to the soil-plug effect. This paper derives an analytical solution to calculate the apparent ph...

New method to calculate apparent phase velocity of open-ended pipe pile

Vertical dynamic response of an inhomogeneous viscoelastic pile

SUMMARY
The dynamic response of an end bearing pile embedded in a linear visco-elastic soil layer with hysteretic type damping is theoretically investigated when the pile is subjected to a time-harmonic vertical loading at the pile top. The soil is modeled as a three-dimensional axisymmetric continuum in which both its radial and vertical displacements are taken into account. The pile is assumed to be vertical, elastic and of uniform circular cross section. By using two potential functions to decompose the displacements of the soil layer and utilizing the separation of variables technique, the dynamic equilibrium equation is uncoupled and solved. At the interface of soil-pile system, the boundary conditions of displacement continuity and force equilibrium are invoked to derive a closed-form solution of the vertical dynamic response of the pile in frequency domain. The corresponding inverted solutions in time domain for the velocity response of a pile subjected to a semi-sine excitation force applied at the pile top are obtained by means of inverse Fourier transform and the convolution theorem. A comparison with two other simplified solutions has been performed to verify the more rigorous solutions presented in this paper. Using the developed solutions, a parametric study has also been conducted to investigate the influence of the major parameters of the soil-pile system on the vertical vibration characteristics of the pile. Copyright © 2013 John Wiley & Sons, Ltd.

Soil-pile interaction in the pile vertical vibration considering true three-dimensional wave effect of soil

Dynamic torsional response of an end bearing pile in transversely isotropic saturated soil

A group of field tests and three-dimensional finite element simulation were used to investigate the behavior of the pre-bored grouting planted pile under compression and tension; moreover, a group of shear tests of the concrete–cemented soil interface was carried out to study the frictional capacity of the pile–cemented soil interface. The load–displacement response, shaft resistance and mobilized base load were discussed based on the measured and computed results. The measured and computed results show that the frictional capacity of the cemented soil–soil interface is better than the frictional capacity of the concrete–soil interface. The frictional capacity of the concrete–cemented soil interface is mainly controlled by the properties of the cemented soil, and the ultimate skin friction of the concrete–cemented soil interface is much larger than that of the cemented soil–soil interface. The frictional capacity of the soil layer close to the enlarged base is also promoted because of the compaction of the enlarged base. The enlarged cemented soil base can promote the behavior of the pile foundation under tension, and the enlarged cemented soil base undertakes approximately 26.3% of the total uplift load under the ultimate bearing capacity in this research.

Kuihua Wang

Papers

Vertical dynamic response of an inhomogeneous viscoelastic pile

Soil-pile interaction in the pile vertical vibration considering true three-dimensional wave effect of soil

Dynamic torsional response of an end bearing pile in transversely isotropic saturated soil

Testing and modeling the behavior of pre-bored grouting planted piles under compression and tension

Analytical solution for distributed torsional low strain integrity test for pipe pile