裂纹对弹性波在混凝土中传播特性的影响研究OA北大核心CSTPCD

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 con-crete 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 re-sults 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.