Abstract
To conduct optical fiber monitoring rock slide model test and optical fiber monitoring of steel concrete interface slip model test, the large triaxial shear test of geotechnical engineering was used. First, the data of sliding distance and optical loss and their dynamic range were obtained. Second, the slide distance and fiber loss relation curve and the fitting equation were worked out. Finally, the typical applications of optical fiber sensing technology in Rock Engineering (high slope engineering, rock foundation of Dam Engineering) slope stability and geological disaster monitoring were put forward.The results showed that optical fiber sensing was very sensitive, and the loss value was 30 to 50dB. The dynamic range of rock slide monitoring fiber was 3 to 3.5mm, and the dynamic range of the interface slip monitoring fiber was 1.6mm. Thus, the sensing system can detect the sliding process of the interface between the concrete and the steel plate. It provides some reference for the sliding monitoring of the composite materials.
Highlights
Structural fracture damage occurs mostly inside the component, which is generally difficult to be observed by the naked eye
The sensing system can detect the sliding process of the interface between the concrete and the steel plate. It provides some reference for the sliding monitoring of the composite materials
On the basis of the analysis of mechanics and optics principle of optical fiber sensing, distributed optical fiber slide sensing and interface slip sensing technology are put forward, which can be used for rock slide and steel-concrete interface slip monitoring
Summary
Structural fracture damage occurs mostly inside the component, which is generally difficult to be observed by the naked eye. The damage identification of such problem in the internal structure is a hard nut to crack. The accidents of high slope landslide and rock slip and the steel-concrete composite structure are applied more and more widely in modern large-scale civil engineering. How to monitor the internal sliding damage of this type is a new problem facing damage identification. How to use non-destructive detection methods to detect these hidden problems effectively, especially in real-time, has increasingly become a research topic in the field of civil engineering and other engineering fields. Internal damage detection for important and old buildings, such as large bridges and workshops, and reinforcement and prolongation of service life based on test results are a concern for civil engineering sector
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