YU A P, CHEN T, CHEN Z H, et al.Study on the effect of cracks on the propagation characteristics of elastic waves in concrete[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(5):183-192.

doi:10.16186/j.cnki.1673-9787.2023050020

Received:2023/05/12

Revised:2023/06/25

Published:2024/07/31

Study on the effect of cracks on the propagation characteristics of elastic waves in concrete

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

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

Abstract: Objectives To study the effect of cracks in concrete on elastic wave propagation，  Methods in this paper， a numerical model of elastic wave propagation in concrete cracks of different morphologies was constructed by using COMSOL software， and an experimental study of elastic wave propagation in concrete with cracks was carried out to systematically investigate the relationship between the characteristics of concrete cracks （angle of cracks， depth of cracks， distance of cracks from the sound source， and the number of cracks， etc.） and the propagation of elastic waves.  Results It is found that the numerical simulation results are in good agreement with the experimental phenomena， verifying the reliability of the numerical model. Among the factors， the number of cracks and the distance of cracks from the sound source have a significant impact on the echo peak value， with the echo peak value of cracks 2 cm from the sound source being the largest at 3.46×10⁶ Pa. The factor that has the greatest impact on wave speed and signal damage is the depth of cracks， where the damage rate of cracks with a depth of 60 mm is as high as 62.14%， and the wave speed attenuates to 2 590.674 m/s， followed by the number of cracks， with the signal damage rate reaching 31.28%. Based on the change law of wave speed for different crack features， a regression analysis of the wave speed relationship model for crack angle and depth showed that the goodness of fit is high， with R₂ values greater than 0.95. Conclusions In summary， the existence and characteristics of cracks in concrete have a significant impact on elastic wave propagation. This study quantifies the impact of crack characteristics on elastic wave propagation in concrete through numerical simulation， providing theoretical support for non-destructive testing technology of concrete.

Key words:crack morphology;echo peak;wave speed signal;damage;crack depth