A Novel Vibration-based Structure Health Monitoring Approach for the Shallow Buried Tunnel

The vibration-based SHM (Structure Health Monitoring) system has been successfully used in bridge and other surface civil infrastructure. However, its application in operation tunnels remains a big challenge. The reasons are discussed in this paper by comparing the vibration characteristics of the f...

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Bibliographic Details
Published in:Computer modeling in engineering & sciences 2012, Vol.86 (4), p.321-348
Main Authors: Zhou, Biao, Xiong Yao Xie, Yeong Bin Yang, Jing Cai Jiang
Format: Article
Language:English
Subjects:
Buried structures
Computer simulation
Dispersion curve analysis
Frequency response functions
Modulus of elasticity
Resonance
Soil structure
Soils
Stiffness
Structural health monitoring
Timoshenko beams
Transfer matrices
Vibration monitoring
Wave dispersion
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Summary:The vibration-based SHM (Structure Health Monitoring) system has been successfully used in bridge and other surface civil infrastructure. However, its application in operation tunnels remains a big challenge. The reasons are discussed in this paper by comparing the vibration characteristics of the free tunnel structure and tunnel-soil coupled system. It is revealed that all the correlation characteristics of the free tunnel FRFs (Frequency Response Function spectrum) will vanish and be replaced by a coupled resonance frequency when the tunnel is surrounded by soil. The above statement is validated by field measurements. Moreover, the origin of this phenomenon is investigated by dispersion analysis based on a novel simulation model termed as TTMM (Timoshenko beam-Transfer Matrix Method). It is proved that the coupled resonance frequency occurs at the intersection of soil and free tunnel flexible wave mode dispersion curves. A simplified method is developed to determine the relationship between the tunnel Young's modulus and the coupled resonance frequency, which can be employed as an index for quantifying the tunnel global stiffness.
ISSN:1526-1492
1526-1506
DOI:10.3970/cmes.2012.086.321