Abstract
The principle and process of the parallel seismic test for the integrity evaluation of in-service piles are introduced in this paper. A 3D finite element model for the pile-soil system is developed for impulse responses. For both saturated and unsaturated soil conditions, velocity-time histories at different depths were obtained using the numerical model. It is shown that the length and one-dimensional P-wave velocity of a pile are easy to determine from the velocity-time histories. By examining the slopes of the first arrival times plotted versus depth or by examining the depth where the amplitude of the first arrival decreases significantly, the bottom or the defect location of the pile can be estimated. The results indicated that the parallel seismic test is a suitable method to evaluate the integrity of in-service piles.
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