Theoretical Analysis of Dynamic Response of Pipe Pile with Multi-Defects

A mathematical model for an outer soil, multi-defects pipe pile, and inner soil dynamic interaction system is established to research the influences of on vibration a pile. The impedance pile deduced by applying Laplace transformation method recursive technique. Then, velocity response at head further obtained using inverse Fourier transform method. Moreover, parametric analyses are conducted type, degree, distribution, length, depth results indicate that characteristics appear different, with amplitude differences reflected signal features admittance curve, respectively. This means analytical solutions relevant can be used detect piles different appearances as measured in engineering practice.