Please use this identifier to cite or link to this item: https://doi.org/10.1061/(ASCE)GM.1943-5622.0000233
Title: Detection of Shallow Anomalies in Pile Integrity Testing
Authors: Chai, H.-Y.
Phoon, K.-K. 
Keywords: Guided waves
Pile integrity testing
Plane waves
Pulse-echo
Scattered waves.
Shallow anomaly
Issue Date: 2013
Source: Chai, H.-Y., Phoon, K.-K. (2013). Detection of Shallow Anomalies in Pile Integrity Testing. International Journal of Geomechanics 13 (5) : 672-677. ScholarBank@NUS Repository. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000233
Abstract: When an impact source is applied to the top of a pile, the waves near the top exhibit strong three-dimensional characteristics. When an anomaly is locally distributed near the top of the pile (shallow anomaly), there are some blind areas on the top, where the waves scattered from the anomaly are very weak or absent. The scattered waves cannot be analyzed by the widely adopted theory of one-dimensional stress waves. When the ratio of the characteristic wavelength of the pulse to the radius of piles is large, the tip reflections approximately behave as the plane waves. The upward tip reflections are reflected at the top. These newly formed second incident waves will be reflected at the shallow anomaly. These reflections from the locally distributed anomaly can be approximately regarded as the plane waves, detected by the receiver at any position of the top and analyzed based on the one-dimensional theory. It can be concluded that with the help of the reflections following the tip reflections, it could be possible to detect shallow anomalies more reliably. © 2013 American Society of Civil Engineers.
Source Title: International Journal of Geomechanics
URI: http://scholarbank.nus.edu.sg/handle/10635/59006
ISSN: 15323641
DOI: 10.1061/(ASCE)GM.1943-5622.0000233
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