Research purposes: Aiming at the identification method for tunnel lining damage, a calculation method based on wavelet packet energy was proposed, which was improved based on the previous research results, and a method with simple algorithm and remarkable damage identification effect was obtained. A new damage index ELG (wavelet packet node energy rich point control index) was established. A three-dimensional tunnel finite element model was established, and the damage identification effect of the method under different working conditions was studied through calculation of various damage conditions. The simulation test was carried out, the response of the tunnel lining under the train load was simulated by the trolley-pipe model, and the response data was analyzed by this method.
Research conclusions:(1)The new damage index ELG has the advantages of high efficiency and high accuracy, and can be used as a damage identification method for linings.(2)The accuracy of damage identification results depends on the arrangement density of points, and the distance between points is the length of the monitoring length. When it is 1/10, it is about the critical value of accurate identification. If it is larger than this value, it will not have the identification effect.
Key words
tunnels /
damage identification /
wavelet packet transform /
improved wavelet packet energy method /
wavelet packet energy
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