This study investigates the deformation of a single pile due to shaft excavation in clayey soil. A two-stage methodology is introduced, which integrates cavity contraction theory with an elasto-plastic model for pile-soil interaction. Initially, this method utilizes cavity contraction theory and an equivalent volume loss assumption to estimate soil displacement caused by shaft construction. Subsequently, continuum theory is employed to develop an interaction model for the pile-soil system, considering the impact of soil displacement and loading history on pile response. Results demonstrate a substantial increase in pile deformation and bending moment as shaft excavation depth increases, particularly when a working load is considered. This also leads to heightened ultimate settlement and maximal axial force. The displacement and bending moment of pile show a linear relationship with the deformation level of the retaining wall, with a marginally steeper rate of settlement increase compared to horizontal displacement. Further analysis, which varies the position of the pile and the average lateral dis-placement of the retaining wall, reveals that the influence of greenfield soil displacement on the pile foundation is more significant than the position of pile itself. Excessive soil displacement can impair the serve function of the pile and, in extreme cases, jeopardize the structural integrity of the pile.