Time-dependent evolution in bearing capacity of driven piles in clays combining installation, consolidation and subsequent loading

Abstract

The analysis of time-dependent variation in the axial capacity of the driven pile is difficult yet critical for geotechnical engineers. To investigate the short-term evolution of bearing capacity of driven piles, a two-dimensional finite element (FE) model is developed using ABAQUS program. The pile installation, soil consolidation and loading are incorporated in an integrated FE model. Changes in excess pore pressure and void ratio of surrounding soil are investigated to evaluate the consolidation mechanism. The findings reveal that the excess pore water pressure dissipated is the primary cause of short-term pile bearing capacity evolution. Excess pore water pressure is dissipated, lowering the void ratio and increasing the strength and stiffness of surrounding soil. The effect of the permeability coefficient is also discussed. The permeability coefficient affects the rate of evolution but does not affect its magnitude. A centrifuge model test is used to verify the numerical results. The findings of this study may serve as a guide for improved design and construction of driven piles.