The gravel pile technique is currently one of the most effective，economical, and widely used methods for dealing with saturated silt soil foundations.Many scholars have conducted research on the gravel pile mechanism with respect to saturated silt or sand foundations，and they have found some useful conclusions.However，further analysis is required on the seismic liquefaction characteristics of gravel piles in saturated silty soils.In this paper, we investigate the seismic liquefaction characteristics of gravel pile in the silt foundations of a number of Anhui expressway roadbed engineering projects.We performed numerical analysis using the three-dimensional finite difference program FLAC3D.By studying the pore pressure increase and the law of dissipation at different distances from the gravel pile center，we determined the reasonable pile space and the reasonable depth of gravel pile strengthening in a saturated silty soil foundation during high-intensity earthquake conditions.These results can provide reference data for similar engineering projects.