Abstract:Based on the fictitious soil pile model, the effect of pile-end stress diffusion on the settlement of single pile is investigated theoretically. Firstly, combining with the fictitious soil pile model and Boussinesq solution, the stress-bubble fictitious soil pile model is proposed to simulate the support of pile end soil on pile body. Then, utilizing a double-fold line model for the pile surrounding soil, an analytical solution for the settlement of single pile embedded in layered soils is derived based on the load transfer method. Furthermore, the effects of parameters such as elastic limit displacement, elastic shear stiffness coefficient and additional stress value, on the settlement of single pile are discussed based on the present solution. Finally, the present method is validated by comparing with code method and existing solution. The most important advantage of the stress-bubble fictitious soil pile model is that, the stress diffusion boundary at pile end can be given more strictly, so it has wider engineering significance.