Geddes’s solution is one of a comment approach to estimate the settlement of subsoil of pile foundation.In order to obtain more precious results,a modified Geddes’s solution was performed as the assumptions that the end resistance uniformly distribute on the pile tip and the side resistance,and the component force of uniform and linear variation distribute on side surface of pile shaft.The formulas of induced stress due to side resistance and end resistance of circular cross-sectional pile were obtained and calculated by double integration.The results of comparative analyses between Geddes’s solution and modified Geddes’s solution showed that the differences between the two methods increase with the increase of pile radius.With pile radius varying from 0.2 m to 3 m,the results disparity between Geddes’s and modified Geddes’s solution are limited in 20%,exceeding to 140%,and closing to 40% due to end resistance, uniform side resistance,and linear variation of side resistance, respectively.The results estimated by Geddes’s solution is greater than reality. Compared with Geddes’s solution,the settlement of the modified Geddes’s solution agrees well with that of finite element analysis.Therefore,the modified solution is more reasonable for designation and application.
