doi:10.16186/j.cnki.1673-9787.2023050020

Received:2023-05-12

Revised:2023-06-25

Online Date:2023-11-30

Study on the effect of cracks on the propagation characteristics ofelastic waves in concrete（Online）

YU Aiping1,2, CHEN Tao1, CHEN Zhehan1, ZHANG Lu1, CHEN Xuandong1,2

1.Guilin University of Technology， College of Civil and Architecture Engineering， Guilin  541004， Guangxi，China;2.Guangxi Key Laboratory of New Energy and Building Energy Saving， Guilin  541004， Guangxi，China

Abstract:In order to study the influence of the presence of cracks in concrete on the propagation of elastic waves， a numerical model of elastic wave propagation in concrete cracks of different forms was constructed using COMSOL software， and an experimental study of elastic wave propagation in concrete with cracks was carried out to investigate the relationship between concrete crack characteristics （crack angle， crack depth， crack distance from the sound source， number of cracks， etc.） and elastic wave propagation. The results show that：The numerical simulation results are in good agreement with the experimental phenomena， and the reliability of the numerical model is verified. Among them， the changes of the crack number and the crack distance from the sound source have a large impact on the echo peak， and the echo peak of the crack 2cm from the sound source is the largest， 3.46×10⁶ Pa； the factors that have the greatest impact on the wave speed and signal damage are the crack depth， the crack damage rate of 60mm depth is up to 62.14%， and the wave speed decays to 2 590.67 m/s， followed by the crack number， and the signal damage rate reaches 31.28%； based on the wave speed variation law of different crack characteristics， the regression analysis of the wave speed relationship model of crack angle and depth. The influence of crack characteristics on the propagation of elastic waves in concrete isquantified by numerical simulation, which provides theoretical support for concretenondestructive testing technology.

Key words:crack morphology;echo peak;wave speed and damage;experiments and analysis

CLC：TU528