Long-Term Response of Consolidating Soft Clays around a Pile considering Non-Darcian Flow

Abstract

In this study, a nonlinear one-dimensional consolidation equation in terms of excess pore pressure is developed by considering the effects of variable permeability and non-Darcian flow condition. Uncoupled analysis for the determination of mobilization of shaft resistance is performed using a nonlinear load-transfer method. Finite-difference technique is used to predict the dissipation of excess pore pressure and settlement of piles. The predicted results are compared with reported numerical and experimental results and are within an error of ±7%. The consolidation behavior of Cordemais clay (exhibiting non-Darcian flow) in terms of dissipation of excess pore pressure and the subsidence of soil surface with time is studied. The development of downdrag and the distribution of shear stress around the shaft of end-bearing and floating piles are also investigated. The dissipation of excess pore pressure is about 75 and 40% for double drainage and single drainage conditions, respectively, after 25 years of consolidation. The total downdrag is about 85 and 115 mm for end-bearing and floating piles, respectively, after 25 years of consolidation.