Damage identification method for connecting surface of double-block type ballastless track roadbed slab and sleeper block

Abstract

The invention discloses a damage identification method for a connecting surface of a double-block type ballastless track rodbed slab and sleeper block. The method comprises the steps of simulating thedamage to the connecting surface of the sleeper block and the roadbed slab by means of a cohesion model with debonding damage; establishing a finite element calculation model of the double-block ballastless track; extracting acceleration vibration response of a roadbed slab and a sleeper block under the action of high-frequency low-amplitude train load, analyzing an energy change rule of a vibration signal in each frequency band based on a wavelet packet decomposition theory, extracting a damage characteristic index, establishing a mapping relationship between a debonding degree and frequencyband energy, and realizing debonding damage degree identification. The identification method provided by the invention is simpler, and can quickly and effectively detect the debonding damage degree of the connecting surface of the roadbed slab and the sleeper block.

Description

Technical field [0001] The invention belongs to the technical field of double-block ballastless track damage identification, and in particular relates to a method for identifying the debonding damage degree of the connecting surface of the double-block ballastless track bed slab and sleeper block. Background technique [0002] The double-block ballastless track is one of the main types of ballastless track structures for high-speed railways in my country. It has the advantages of uniform structure and low construction cost. As of the end of 2018, a total of 44 high-speed railway ballastless tracks have been built, of which 27 lines including Xicheng Passenger Dedicated, Wuhan-Guangzhou Passenger Dedicated and Guiguang High-speed Railway adopt CRTS I double-block ballastless tracks, which are widely used. The CRTSI type double-block ballastless track is used as the driving foundation. It is exposed to the complex natural environment for a long time and bears the long-term effects ...

AI Technical Summary

Problems solved by technology

[0004] In the analysis of the damage behavior in the above literature, the recognition of debonding damage at the joint surface of the double-block ballastless track bed slab and the sleeper block is rarely considered, and the interlayer damage detection method is cumbersome, and the actual damage cannot be detected quickly and effectively. degree

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