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This paper discusses the modeling and interpretation for ground anchor failures under the pullout load test. A real-time acoustic monitoring technique was used in the field tests on two pre-stressed anchors. One-dimensional analytical model was established to model the anchor's behaviors. With the use of attenuation law for waves propagating at the concrete panel, the predicted signals were found comparable to the field data and the 2D/3D finite element modeling using ABAQUS. It was found that the analytical model could capture closely the progressive failures of the ground anchor. By analyzing the signals appearing at the concrete wall, the author suggests the use of Power spectrum density with Welch window method. With the application of short time Fourier Transform, the Hamming window is preferred. It is also found that the resulting signals are highly dependent of the failures. As the damages become more severe, the signals at the time-frequency domain as a result of the short time Fourier Transform would be more distributive.
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