Control network for monitoring deformation of slope by using optical measurements and FBG sensors

C. Li; H. Liu; Z. Wang; Y. N. Li; Y. Chen; X. P. Xu; J. C. Xu

doi:10.1117/12.904909

30 November 2011 Control network for monitoring deformation of slope by using optical measurements and FBG sensors

C. Li, H. Liu, Z. Wang, Y. N. Li, Y. Chen, X. P. Xu, J. C. Xu

Proceedings Volume 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 820105 (2011) https://doi.org/10.1117/12.904909
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

The ground deformation observation is the method that estimates the ground deformation according to the displacement change of work spot measured periodically. By using the repeatability of the mechanical transducer and the reliability of the wavelength modulation, the differential fiber Bragg grating settlement gauge reduces availably the disturbance of the artificial causation and the weather. In this scheme, the drive rod converts the displacement of settlement block into the strain of beam, and causes the Bragg wavelength shifts of the sensing gratings mounted on the top and bottom surfaces of the beam, on which the temperature-compensated is achieved by the differential operation of the shifts of Bragg wavelengths. Because the collapse of slope is caused by the cutting slippage as the shearing strength in the soil body of slope exceeded the anti-shearing intensity, the slide prevention pier is the regular retaining structure for treating slope. The differential fiber Bragg grating settlement gauge is developed and fixed on the pier, which converts the settlement of the observation point into the Bragg wavelength shifts of the sensing gratings. Applied in Bai Ni-jing Slope, the measurement precision between the settlement gauges and Wild N3 precise level is 0.03, which is satisfied with the engineering order measure precision 0.05~0.1. By subtract the displacement-induced settlement deviation, the corrected precision between the settlement gauges compensated by Leica J2 theodolite and the precise level is improved to 0.007, which is satisfied with the scientific research order measure precision 0.01~0.05.

Citation Download Citation

C. Li, H. Liu, Z. Wang, Y. N. Li, Y. Chen, X. P. Xu, and J. C. Xu "Control network for monitoring deformation of slope by using optical measurements and FBG sensors", Proc. SPIE 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 820105 (30 November 2011); https://doi.org/10.1117/12.904909

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