混凝土防渗面板裂缝综合无损检测技术研究

针对某面板堆石坝混凝土防渗面板表面裂缝，采用地质雷达法、冲击回波法和超声波平测法等无损手段进行检测，分析了不同裂缝的电磁波场响应特征，评估了冲击回波法和超声平测法对不同裂缝的检测效果及影响因素，并进行了误差分析；对比钻孔取芯结果，探讨了基于整体快速探测与局部精准测量相结合的综合无损检测方法在裂缝检测中的有效性和精准度。研究结果表明：地质雷达法直观高效，可实现对防渗面板裂缝的整体检测，快速识别裂缝分布及物性形态；冲击回波法和超声波平测法以其准确灵活的优势，可进一步判定裂缝的深度；通过合理组合检测方法、科学布设测线，综合无损检测方法可查明目标区域裂缝的位置分布、形态规模和具体尺寸，提升裂缝检测的全面性、准确性及精准度。

Study on integrated non-destructive inspection technology for impervious concrete panel cracks

Surface cracks in the impervious concrete panel of a concrete faced rockfill dam were examined by employing several non-destructive testing methods, including ground penetrating radar, impact echo and ultrasonic plane inspection. The characteristics of electromagnetic response of different types of cracks were analyzed, the effects and influencing factors of impact echo and ultrasonic plane measurement upon different cracks were assessed with error analysis. By comparing with direct drilling results, the effectiveness and accuracy of integrated non-destructive method, which was established by incorporating holistic rapid inspecting and local accurate measurement, were discussed in crack detection. The results indicate that ground penetrating radar, with its intuitive and high efficiency, can achieve an overall investigation of impervious panel cracks, and quickly indentify their distribution and physical properties. The impact echo and ultrasonic plane mearsuring method, with their accuracy and flexibility, can further determine the crack depth. Through reasonably combining testing methods and scientifically laying out survey lines, the proposed methods can identify the distribution, basic properties, scope and size of cracks, whilst improving the comprehensiveness, accuracy and precision of detection.