Notice of RetractionAn audio-frequency stress wave reflection method for engineering evaluation of pile testing

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

In this paper, an audio-frequency stress wave reflection method for engineering evaluation of pile testing is presented. First, the standard samples to train the system and extract module parameters suitable for the measuring environment are selected to detect the defects location and the length of the tested pile; then, the parameters are inputted into the hybrid model based on the FFT analysis, wavelet de-noising and Hilbert transform to extract the instantaneous phase change-point caused by reflected wave. The proposed method is applied to the bolt anchoring quality inspection on the Gongboxia Hydropower Station in Qinghai province. The experimental results show that the average error of the proposed method for detecting length and defect location are 2.5% and 2.1% respectively, much lower than the traditional method of 6.6% and 6.9%.