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Open AccessArticle

Experimental Study on Deformation Monitoring of Bored Pile Based on BOTDR

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
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Appl. Sci. 2019, 9(12), 2435; https://doi.org/10.3390/app9122435
Received: 30 April 2019 / Revised: 7 June 2019 / Accepted: 10 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Recent Progress in Fiber Optic Sensors: Bringing Light to Measurement)
In order to study the deformation of bored pile, it is necessary to monitor the strain of the pile. The distributed optical fiber sensing technology realizes the integration of sensing and transmission, which is incomparable with traditional point monitoring method. In this paper, the Brillouin optical time domain reflectometer (BOTDR) distributed optical fiber sensing technology is used to monitor the deformation of the bored pile. The raw data monitored by BOTDR is processed by the wavelet basis function, that can perform noise removal processing. Three different methods of noise removal are chosen. Through the processing, the db5 wavelet is used to decompose the deformation data of bored pile monitored by BOTDR into two layers. The decomposed high-frequency signal is denoised by the Stein-based unbiased risk threshold, rigrsure. The decomposed data is smoothed by the translational mean method, and the final data after denoising and smoothing processing is real and reliable. The results of this study will provide data support for the deformation characteristics of bored pile, and also show the advantages of distributed optical fiber sensing technology. View Full-Text
Keywords: bored pile; deformation of pile; BOTDR; optical fiber monitoring; data processing bored pile; deformation of pile; BOTDR; optical fiber monitoring; data processing
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MDPI and ACS Style

Gao, L.; Han, C.; Xu, Z.; Jin, Y.; Yan, J. Experimental Study on Deformation Monitoring of Bored Pile Based on BOTDR. Appl. Sci. 2019, 9, 2435.

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