Low strain pile testing based on synchrosqueezing wavelet transformation analysis

• Main Authors: Juncai Xu, Qingwen Ren, Zhenzhong Shen
• Format: Article
• Language: English
• Published: JVE International 2016-03-01
• Series: Journal of Vibroengineering
• Subjects: low strain testing; synchrosqueezing wavelet transformation; nondestructive testing; signal-to-noise ratio
• Online Access: https://www.jvejournals.com/article/16851

Low strain detection, an indirect and nondestructive testing method, is one of the main pile integrity testing methods. We propose low strain testing analysis based on a synchrosqueezing wavelet transformation (SST). Through a typical model pile test, the SST is applied to identify pile bottom signal reflection time and to separate signal from noise. It is also compared with the conventional wavelet de-noising and the empirical mode decomposition (EMD) de-noising method. Results show that the SST technique can be used to identify the reflected signal of the pile bottom, achieve signal and noise separation, and improve signal-to-noise ratio. The method has significant advantage in low strain detection signal processing compared to other methods.