Immersed tube tunnel deformation monitoring and stress analyzing system and application method and functions of immersed tube tunnel deformation monitoring and stress analyzing system

Abstract

The invention relates to the field of infrastructure structure safety health monitoring, in particular to an immersed tube tunnel deformation monitoring and stress analyzing system based on optical fiber sensing and an application method and functions of the immersed tube tunnel deformation monitoring and stress analyzing system. The immersed tube tunnel deformation monitoring and stress analyzing system has the advantages of being compact in structure, high in stability and flexibility, resistant to electromagnetic interference, high in environment adaptive capacity and the like. When a fiber bragg grating in a sensor is manufactured, the duty cycle adopted for an optical fiber mask plate is 0.5, the optimal groove shape depth is 234+ / -10 nm, the zero-level diffraction efficiency of the fiber bragg grating can be as low as 2%, the diffraction efficiency of the + / -1 class can reach 36%, the manufacture fiber bragg grating has the advantages of being high in reflectivity and side-mode suppression ratio, narrow in bandwidth, and the like, and the measurement result is more accurate; monitoring data are transmitted through a wireless remote data transmission network, the advantage of remote monitoring is achieved, and the monitoring work is quite conveniently conducted.

Description

Technical field [0001] The invention relates to the field of safety and health monitoring of infrastructure structures, in particular to an immersed tube tunnel deformation monitoring and force analysis system based on optical fiber sensing and its use method and application. Background technique [0002] Due to its unique advantages in economy and technology, especially the breakthrough progress in underwater connection and foundation treatment, immersed tube tunnels are becoming more and more popular in the engineering community. Compared with mine tunnels, immersed tube tunnels are unique in terms of force. In addition to being subjected to overlying static loads and passing loads, immersed tube tunnels are also subject to wave loads and erosion by ions in the water, and most of them sink. Tube tunnels are all built in soft soil or water areas and are very sensitive to settlement and deformation. At this stage, there are a lot of researches on settlement issues, but less on s...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the existing deformation monitoring and internal force calculation of immersed tunnels, the present invention provides a deformation monitoring and force analysis system for immersed tunnels based on optical fiber sensing, which provides high precision for the deformation of immersed tunnels during construction and later operation. Real-time monitoring, and back calculation of the deformation and external force of the segments

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