Abstract: According to the characteristics of installation of seismic piezocone penetration testSCPTu) penetrometers and jacked-in piles, the penetration process is simulated by means of the cavity expansion theory. Based on this evaluation, the analytical solutions of the limit pressure of spherical and cylindrical cavities are presented. According to the analytical solutions and comparison of forces between SCPTu penetrometers and the piles, an analytical relationship between the data measured from SCPTu and the ultimate bearing capacity of a single pile is established. Compared with the axial load tests on a single pile in the field, the value of the new analytical solution which is used to predict the ultimate bearing capacity of jacked-in piles by utilizing the SCPTu data is verified.