Analysis of the existing pile response induced by adjacent pile driving in undrained clay

An analytical method for quantitatively predicting the existing pile behavior induced by adjacent pile driving is of great engineering significance to evaluate the potential influence of adjacent pile penetration on existing piled buildings. In this paper, a simplified two-stage approach is employed to derive the vertical and lateral responses of the existing pile during adjacent pile installation. First, the free-field soil movement due to pile penetration is estimated by an improved source-sink imaging technique considering the existence of the top free surface. The validity and accuracy of this calculation approach are subsequently examined via comparison with published studies. Second, the shear-displacement method and improved Pasternak foundation model incorporating the impact of lateral soil displacement are introduced to investigate the pile-soil interaction. Moreover, based on the Randolph-Worth logarithmic attenuation function and Mindlin's solution, the pile group response considering the shielding effect of piles is analyzed. Finally, the present solution for a single pile response is validated with the existing theoretical solution and the simulation solution, and extensive parameter studies are conducted to systematically discuss the variation of the behavior of the existing single pile and pile group.