Three-Dimensional Effects in Low-Strain Integrity Testing of Large Diameter Pipe Piles
Publication: Journal of Engineering Mechanics
Volume 142, Issue 9
Abstract
The interpretation of low-strain integrity testing performed on piles is commonly based on methods developed from the one-dimensional wave propagation theory. However, stress waves generated from the impact of the hammer on the head of a pipe pile propagate not only along the vertical, but also the circumferential and radial directions. One-dimensional methods that ignore these waves may underestimate the amplitude of the incident wave, and fail to predict the development of high-frequency interferences that may compromise the assessment of the integrity, particularly of large-diameter pipe piles. To account for these three-dimensional effects, the authors formulate a solution for determining the vertical vibration response along the cross-section of the pipe pile head to an impact load, which robustly accounts for coupling of pipe pile and viscoelastic soil vibrations. Presentation of the method is followed by a discussion on identifying the mechanisms that underlie body and surface stress-wave propagation along the section of the pipe pile head, and the conditions under which these may undermine the interpretation of pile integrity tests with conventional one-dimensional methods. A detailed parametric investigation revealed that there is an optimal position of the receiver, relative to the hammer impact, where the amplitude of the high-frequency interferences is minimized and the arrival of the reflected wave is clearly identified in the waveforms.
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Acknowledgments
This work was supported by the 111 project (Grant No. B13024) and the National Natural Science Foundation of China (Grant No. 51378177 and 51420105013). The first author would like to acknowledge the support from the ARC Centre of Excellence for Geotechnical Science and Engineering in Australia.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 9 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 24, 2015
Accepted: Mar 24, 2016
Published online: May 19, 2016
Published in print: Sep 1, 2016
Discussion open until: Oct 19, 2016
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