冲击映像方法在水工结构渗漏病害检测中的应用

Application of Impacted Image Method to Water-Seepage Disease Testing of Hydraulic Structure

冲击映像法作为一种基于弹性波反射原理的无损检测方法,具有检测速度快、结果直观可视的特点,能够快速的评价地下介质沿垂直和水平方向的变化。针对水工结构及其下部基础的特点和常见病害,以弹性波在多层介质不同交界面的传播特性为理论基础,采用有限元动力法分析弹性波传播特性与缺陷位置、缺陷大小的相关性,特别关注介质表面的冲击响应能量与缺陷位置、大小的关系,明确介质中缺陷的平面分布情况,评价了该检测方法的误差影响因素。在此基础上,以具体水工结构渗水病害检测工程为背景,详细探讨了适用于水工结构检测的数据采集、分析、结果修正和结果可视化处理的方法,最后评价了缺陷分布和可能存在的渗透路径。

The impacted image method is a kind of nondestructive examination method based on the principle of elastic wave reflection, which has advantages of rapid detection and visualization of results. And it can fast evaluate the underground medium along the vertical and horizontal directions Aiming at the characteristics and common diseases of hydraulic structure and its foundation, the correlation analysis on elastic wave propagation characteristics, defect location and defect size was carried out by dynamic finite element method, which was taking the characteristics of elastic wave propagation in multilayer medium with different interface as the theoretical foundation. The relationship between the impact response energy of medium surface and defect location and size was especially focused. The plane distribution of defects in the medium was cleared. The impact factors on error of the impacted image method were also evaluated. On this basis, taking the concrete hydraulic structures seepage disease detection project as the background, the method which was adapt to the data acquisition, analysis, result correction and visualization processing of the hydraulic structure detection was discussed in detail. Finally, the defect distribution and possible infiltration paths were evaluated.