核电混凝土裂缝深度的超声检测

Ultrasonic detection of crack depth of nuclear power concrete

在混凝土中加入防辐射重晶石材料以模拟核电混凝土,设计不同裂缝深度试件,对不跨缝声学参数进行拟合,得出相应试件的截距和声速,利用超声波法首波反相确定相应测点的裂缝声学参数,计算出实测的裂缝深度。在时距法基础上对深度为40~80 mm的裂缝进行计算,分析得出设计裂缝深度与实测裂缝深度相应的误差范围。结果表明,裂缝深度越深,工况越复杂,其误差越大;首波反相方法具有较高准确性。

Anti-radiation barite material was added into concrete to simulate nuclear power concrete,and specimens with different crack depths were designed.The intercept and sound velocity of the corresponding specimens were obtained by fitting the acoustic parameters of non-crossing joints.The acoustic parameters of cracks at the corresponding measuring points were determined by the first wave inversion of ultrasonic method,and the measured crack depths were calculated.Based on the time interval method,the corresponding error range between the designed crack and the measured crack is obtained by calculating and analyzing the crack depth of 40-80 mm.The results indicate that the depth of crack is deeper,the error will be larger due to the complexity of working conditions.The first wave inversion method has high accuracy.