A damage identification method for the connection surface between ballastless track bed slab and sleeper block

Abstract

The invention discloses a damage identification method for the joint surface of a double-block ballastless track bed slab and a sleeper block. The method adopts a cohesive force model including debonding damage to simulate the damage of the joint surface of a sleeper block and a ballast bed slab, and establishes a double-block ballastless track. The finite element calculation model of the track extracts the acceleration vibration response of the track bed slab and sleeper blocks under high-frequency and low-amplitude train loads, analyzes the energy variation of vibration signals in each frequency band based on wavelet packet decomposition theory, extracts damage characteristic indicators, and establishes the debonding The mapping relationship between degree and frequency band energy is used to identify the degree of debonding damage. The identification method of the invention is more concise, and can quickly and effectively detect the debonding damage degree of the joint surface of the track bed slab and the sleeper block.

Description

technical field [0001] The invention belongs to the technical field of damage identification of a double-block ballastless track, and in particular relates to a method for identifying the debonding damage degree of a joint surface of a double-block ballastless track bed slab and a sleeper block. Background technique [0002] Double-block ballastless track is one of the main types of ballastless track structure 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 track lines have been built, of which 27 lines such as Xicheng Passenger Dedicated, Wuhan-Guangzhou Passenger Dedicated and Guizhou-Guangzhou High-speed Railway adopt CRTS I type double-block ballastless track, which is widely used. The CRTSI double-block ballastless track is used as the foundation of the train. It has been exposed to complex natural environments for a long time, and it has been...

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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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