Determining Pile Wave Velocity from Sonic Echo Measurements Using Radially Propagating Waves
Publication: IFCEE 2021
ABSTRACT
Sonic echo (SE) measurements are commonly used for integrity testing of deep foundations and to determine the length of unknown foundations. The rod wave (unconstrained compression wave) velocity of the pile is an important parameter that is directly used to calculate the length of the pile or the distance to a pile defect. Often, it is not possible to measure the rod wave velocity, so assumed values are used, which creates uncertainty in length determination and defect location. It has been observed that SE measurements performed with short-duration impulse sources generate narrow-band, high frequency noise. Finite element simulations using ABAQUS show that this high frequency noise results from resonance in the radial direction of the pile and is a function of rod wave velocity, Poisson’s ratio, and the geometry of the pile. In this study, it is shown that measurements of the frequency and particle velocities of this radially propagating wave during SE testing allow for determination of the rod wave velocity and Poisson’s ratio of the pile without the need for additional velocity measurements or use of assumed values. Results from numerical simulations and experimental validation are presented.
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REFERENCES
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IFCEE 2021
Pages: 433 - 442
Copyright
© 2021 American Society of Civil Engineers.
History
Published online: May 6, 2021
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