Concrete gravity dam deformation optical fiber sensing monitoring technology and concrete gravity dam deformation optical fiber sensing monitoring system

Abstract

The invention discloses a distribution-type optical fiber sensing system and a technical scheme, which are used to realize integrated on-line remote measurement of dam body-batholith internal deformation three components of a gravity dam, a dam body joint, and diastrophism, cracking, and extrusion of a bedrock tectonic belt, and is used to realize dam multidimensional-large scale spacetime full coverage. A plate-shaped beam of a novel optical fiber packaging structure---narrow rectangular section is provided, and the tension-compression sides of the plate-shaped beam are provided with microtubes to form an Euler elastic beam, and then the force-light direct conversion of the optical fiber is realized. An arrangement type of a sensing system in the gallery and the vertical shaft of the dam-bedrock, the comprehensive use of the sensing system, and an optical fiber laying technology are provided. The multifunctional integration of the optical fiber monitoring is achieved, construction is facilitated, the survival rate of the optical fiber is guaranteed, and application is convenient. An optical signal demodulation device adopts a high precision PPP-BOTDA or a hybrid Brillioun-Rayleigh system, and is multifunctional for being used for projects of monitoring a concrete temperature-reservoir water temperature, a slit position in front of a dam(factory), and a reservoir slit, and other optical fiber monitoring projects, and therefore upgrading and updating of a safety monitoring system are prompted.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing monitoring system and technical scheme for the deformation of a concrete gravity dam, which can realize the distributed optical fiber sensing online monitoring of the internal deformation of the concrete gravity dam body and dam foundation. Background technique [0002] So far, the internal deformation monitoring of concrete gravity dams and their dam foundations has commonly used shallow tension method, laser alignment, vertical line method, static level, inclinometer tube, steel wire displacement meter and so on. Among them, some equipment requires manual on-site operation, such as active inclinometers, laser alignment, etc., and it is difficult to achieve real-time online telemetry; most equipment needs to be measured by electrical measuring equipment such as coordinate instruments; The working hours are still unsatisfactory; they are often arranged in typical dam sections, which cannot be...

AI Technical Summary

Problems solved by technology

[0009] To sum up, it is easy to see that for concrete gravity dam projects, the existing method of directing optical fibers into concrete for slender members such as piles and beams is obviously not suitable for large-volume concrete high dam projects in terms of technology and structural mechanism.

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