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  Damage Identification Method Based On Wavelet Energy Band In Shield Tunnel Structure

  Rail Transit System is a traffic lifeline of a city. It’s crucial for the health service of the shield tunnel structure on the safe operation of the city. The damage identification of tunnel structure (lining cracking, bolt loosening, concrete deterioration and soil erosion after lining of tunnel) is a key technology in structural health monitoring system. However, it’s very difficult to identify damages on the tunnel structure due to significant non-linear characteristics of tunnel structure and hardly measured excitation and unpredictable interaction between soil and structure. In this study, we propose a method to identify the tunnel structure damages based on the vehiclemounted accelerometer of the service train, in which the distribution of structure stiffness of the tunnel can be continuously measured. Firstly, the vehicle-tracktunnel coupling model is established to analyze the vehicle response by change of stiffness of the track and tunnel. Then, the wavelet energy band damage index is constructed based on the principle of wavelet transform. Finally, the validity ofwavelet energy band damage index is verified in numerical simulation.

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