Abstract:In order to develop a theoretical model that can fully consider the coordinated deformation characteristics between the components of pile-supported embankments, a double equal settlement plane model for embankment-pile-soil coordinated deformation is proposed based on the deformation mechanism of the pile-supported embankments with the flexible pile. Firstly, the model introduces an equal settlement plane at a certain depth below the pile-toe base on the deformation characteristics of the pile-supported embankment and the equal settlement plane in the embankment. Secondly, considering the deficiencies of the existing soil-column model, a new soil-column model that can consider the influence of the relative displacement on the coefficient of friction between the inner and outer soil columns is proposed. The stresses at equal settlement plane are affected by the coordinated deformation between the embankment, pile and soil, thus affecting the overall settlement of the embankment and the pile-soil stress ratio. Finally, the calculation results of the proposed method and the composite modulus method are compared with the measured values. The results demonstrate that the calculation errors of the settlement are 9.6% and 19.4%, respectively. The relative error of the pile-soil stress ratio calculated by the proposed model is 9.91%, which verifies the rationality of the proposed model.