Abstract:Based on the elastic theory method,a new nonlinear model for single pile settlement analysis is proposed. The nonlinearity of soil deformation under the pile bottom or the pile side,and the contact nonlinearity at the interface between the pile and soil are considered. The model assumes that any force in soil can cause nonlinear displacement at the place where it acts on and linear displacement at other place. The nonlinear displacement influence factor is calculated by the hyperbolic relation between load and displacement,which can be obtained from the in-situ load tests or derived from the basic parameters of soil. The linear displacement influence factor is calculated with the Mindlin solution,which is derived from the elastic theory. A rigid-plastic interface model for the pile-soil interface is adopted. The new model combines the advantages of load-transfer model and elastic theory model for single pile analysis,and considers both the continuity of soil and the capacity of displacement transfer of soil. The detailed processes of the displacement vectors of soil segments and pile segments and parameters choice method for the model are given. Calculation results of two examples show they agree well with test data.