Technical scheme and system of distributed optical fiber sensing for high arch dam deformation monitoring

Abstract

The invention discloses a distributed fiber optic sensing technology and a system for monitoring of deformation of a high arch dam, which relate to the field of crossing of a dam safety monitoring technology and a fiber optic sensing technology and are used for overcoming the defect of a conventional means for the monitoring of the deformation of the high arch dam and filling the blank of using distributed fiber optic sensing for the monitoring of the deformation of a dome dam. Aiming at the characteristics and the difficulties of the dome dam, two kinds of unique curved fiber optic packaging structures, namely, fiber optic monitoring panels in a weakly curved beam type and a micro-bending beam type, are provided. Based on error analysis and curved beam height control-camber beam segmentation construction, excellent performance, high reliability, long service life, convenience and practicability of monitoring of fiber optic deformation are ensured. A convenient and practical layout installation mode in an arch dam and a gallery, a vertical shaft and a footrill of a dam foundation is provided, so that online remote metering on multi-dimensional and large-scale time-space broad coverage of three components (radial horizontal displacement, tangential horizontal displacement and vertical displacement) of internal deformation of the arch dam, the dam foundation and a dam abutment is realized. An optical demodulation instrument is multifunctional and can be used for metering concrete temperature, reservoir water temperature, slit level in front of a dam, reservoir sedimentation and the like.

Description

[0001] Distributed Fiber Optic Sensing Technology and System for Monitoring of Deformation of High Arch Dam technical field [0002] The invention belongs to the intersection field of dam safety monitoring technology and optical fiber sensing technology, and particularly relates to a technical scheme and system for distributed optical fiber sensing monitoring of high arch dam deformation, which can realize the dam body and abutment of hyperbolic arch dams Multi-dimension-on-line monitoring with wide temporal and spatial coverage for distributed fiber optic sensing of internal deformation of dam foundations. Background technique [0003] The conventional method for horizontal displacement monitoring of arch dams is mainly the vertical line method, which is set in a typical dam section in the dam body, and the single-section line is about 50m long; the vertical displacement monitoring mostly uses static leveling. The deformation monitoring of the dam foundation and abutment is...

AI Technical Summary

Problems solved by technology

[0014] When transplanting the existing engineering-applied optical fiber deformation monitoring technology to the arch dam project, the key problem is: the linear optical fiber package structure (straight beam) is difficult to adapt to the shape of the hyperbolic dam; New technical solutions for the shape, structure and accuracy analysis of the practical curved package structure; it is also necessary to solve the layout problem of the optical fiber sensing system in the high arch dam; and optimize the selection of the demodulator of the optical fiber deformation monitoring system type

[0015] The technical problem to be solved by the present invention is to overcome the defects of conventional equipment for deformation monitoring of high arch dams and the blank of distributed optical fiber sensing for deformation monitoring of hyperbolic arch dams, and provide a kind of hyperbolic arch dam that can adapt to the specific needs, Technical solution and system for on-line telemetry of high arch dam deformation with engineering practicability

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