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Distributed fiber optic shape sensing along shotcrete tunnel linings: Methodology, field applications, and monitoring results

Deformation monitoring and structural reliability assessment are key components in modern conventional tunneling….In recent years, distributed fiber optic sensing (DFOS) has become more popular in tunneling applications. DFOS measurements basically deliver internal strain and temperature distributions, but no direct relation to the tunnel shape’s behavior. This paper introduces a novel sensing and evaluation concept, which combines DFOS strain measurements and geodetic displacement readings for distributed shape assessment along curved structures, such as tunnel cross-sections. The designed system was implemented into shotcrete tunnel cross-sections as well as shaft linings and enables the determination of displacement profiles with high spatial resolution in the range of centimeters….demonstrate the high potential of the developed approach and its capability to extend traditional monitoring methods in tunneling.
Distributed fiber optic shape sensing along shotcrete tunnel linings: Methodology, field applications, and monitoring results
Journal of Civil Structural Health Monitoring January 27, 2021
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