Tests on distributed monitoring of deflection of concrete faces of CFRDs

HE Bin; HE Ning; XU Bin-hua; CAI Ren; SHAO Han-lin; ZHANG Qi-ling

doi:10.11779/CJGE202005005

Volume 42 Issue 5

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Chinese Journal of Geotechnical Engineering > 2020 > 42(5): 837-844. > DOI: 10.11779/CJGE202005005

HE Bin, HE Ning, XU Bin-hua, CAI Ren, SHAO Han-lin, ZHANG Qi-ling. Tests on distributed monitoring of deflection of concrete faces of CFRDs[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(5): 837-844. DOI: 10.11779/CJGE202005005

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Tests on distributed monitoring of deflection of concrete faces of CFRDs

1.
Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China
2.
Nanjing CaZor Instruments Co., Ltd., Nanjing 210037, China

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Received Date: May 04, 2019
Available Online: December 07, 2022

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Abstract

Abstract

Ensuring the safety of concrete faces is the key to the safe operation of concrete face rockfill dams (CFRDs). The deflection is an important index to monitor the integrity of a concrete face. Based on the distributed optical fiber sensing technology, a new technology is proposed to monitor the deflection of concrete faces of CFRDs, and systematic tests are carried out to verify the measurement accuracy of this new technology as well as its feasibility. Based on the Matlab program and the quasi-distributed scatter strain test data, a method for calculating deflection is established. The research findings show that the calculated deflection at each measurement point on the concrete face is consistent with the measured one at the corresponding position (the absolute error is 5 mm, and the average relative error is 3%). It is validated that this new technology can monitor the deflection including irregular deflection with millimeter accuracy. It is also suitable for the distributed monitoring of the deflection of the full section of concrete faces and the measurement of large deflection. The proposed advanced technology is proved to be applicable to monitoring the deflection of the entire concrete face of a 300-meter level CFRD in a distributed manner.
- concrete face,
- deflection,
- distributed optical fiber sensing technology,
- measurement accuracy

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References (16)

References

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