In light of that the progressive deformation of pile-soil system is not taken into account in the determination of bearing behavior of pile at present

field test and theoretical analysis are used to analyze the bearing mechanism of single pile considering progressive failure of pile-soil system. Firstly

the skin friction degradation and end resistance softening are analyzed using field test results; and then the softening models of skin friction and end resistance are proposed. Furthermore

determinations of the parameters related to the softening model of skin friction and end resistance are presented

and the reliability of the proposed models is demonstrated. As to the bearing behavior of a single pile considering progressive failure of pile-soil system

a highly effective iterative computer program is developed using the proposed softening model. Comparisons of the load-settlement response demonstrate that the proposed method is generally in good agreement with the field-observed behavior

and can assess the failure characteristic of skin friction and end resistance. For practical purposes

different load transfer functions of skin friction and end resistance can be selected in the proposed iterative computer program to capture a single pile response at different loading levels.