Research on Detection of Existing Defect Piles by Parallel Seismic Testing

Compared with the traditional reflected wave (RW) tests, Parallel Seismic (PS) test has the advantages of less interference from the upper building and less signal loss, and has a good application prospect in the detection of foundation piles. However, there are few studies on the comparison of intact piles and defective piles. In this paper, Parallel Seismic (PS) test is used to establish three-dimensional finite element models of intact piles and defective piles respectively. Impulse load is applied to the upper part of the model, and the dynamic time history analysis is carried out on the P-wave signal obtained in the side hole, and the length of the pile body and the position and length of the defect are calculated. The experimental results show that the relative errors of detecting intact piles and defective piles are 4.5% and 5.1%, respectively. It shows that the side-hole transmission wave method has better applicability and higher accuracy for existing foundation piles.