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Axisymmetric consolidation analysis of driven piles in rheological soft clay considering installation-induced permeability disturbance
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DOI：10.1016/j.compgeo.2026.108484.png)
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Abstract
En 中文
Pile installation in soft clay generates significant excess pore water pressure (EPWP) and disturbs the surrounding soil, substantially altering subsequent consolidation behavior and the time-dependent recovery of pile-soil interaction. This study develops an axisymmetric consolidation model for impervious displacement-type driven piles in rheological soft clay, explicitly accounting for installation-induced disturbance. A radially disturbed zone is introduced to characterize the smear effect, where the radial permeability is assumed to increase linearly from a reduced value at the pile-soil interface to the undisturbed state at the zone’s outer boundary. To capture the secondary compression and creep characteristics of the clay, the generalized Voigt model is integrated into the consolidation framework. Based on Darcy’s law and the viscoelastic constitutive relation, the governing equation for EPWP dissipation is derived. To ensure numerical stability and handle the spatial variability of soil properties, a robust numerical solution is developed using the Alternating Direction Implicit (ADI) finite difference method. The proposed model is validated against field measurements, demonstrating a high degree of accordance. Parametric analyses reveal that rheological parameters significantly influence both the consolidation rate and the spatial redistribution of EPWP. Specifically, the number of Kelvin elements dictates the multi-stage nature of the consolidation response, while the viscosity coefficients (K0 and K2) exert distinct effects on dissipation. This model provides a robust theoretical framework for predicting the long-term consolidation performance of driven piles in rheological soil deposits.
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