Abstract: Based on Biot’s theory, the general solutions for a poroelastic half space subjected to moving loads and the fundamental solution corresponding to a vertical harmonic force applied at the interior of a saturated half space are developed via the Fourier transform and Hankel transform method. Utilizing Muki’s method, the second kind of Fredholm integral equation describing the dynamic interaction between a pile and the half space is obtained. Numerical results in the time-space domain are obtained by performing the inverse Fourier transform. Numerical results show that the moving load can generate negative frication at the side of the pile. The maximum axial force of the pile and the pore pressure along the pile side increase with increasing load velocity. In addition, the pore pressure concentration phenomena occur at the upper part of the pile.

Key words: moving loads, poroelastic half space, pile, Biot’s theory, Fredholm integral equation, IFFT method.