基于超声导波的埋地管道检测技术研究

Research on Detection Technology of Buried Pipelines Based on Ultrasound Guided Wave

通过试验研究的方法针对不同防腐层的样管,测试了超声导波在沥青、环氧粉末和聚乙烯防腐层中的传播特性;同时,分别在沙土和黏土埋地环境中测试导波对不同参数的缺陷的检测能力。结果发现,超声导波在无防腐层管道中的衰减最小,而在沥青、环氧粉末防腐层管中的衰减加剧,在聚乙烯防腐层管中的衰减极为剧烈;同时,缺陷的尺寸越大、距离越短,管道的埋深越低,导波的能量衰减越小;而埋地材料对超声导波的影响相对较为明显,黏土环境中导波能量的衰减远高于沙土环境。

The propagation characteristics of the ultrasonic guided wave in different anti-corrosion coatings like asphalt,epoxy powder and polyethylene coatings were tested through experiments;meanwhile,the detection capability of guided waves for defects with different parameters was tested in sandy and clay buried environments.The results show that,the attenuation of ultrasonic guided wave in non-anticorrosive pipeline is the smallest,and the attenuation of ultrasonic guided wave in asphalt and epoxy powder anticorrosive pipeline is intensified,and the attenuation in polyethylene anticorrosive pipeline is extremely severe;in addition,the larger defect size,the shorter distance and the lower buried depth of pipeline can result in the smaller attenuation of guided wave energy;and the influence of buried material on ultrasonic guided wave is relatively obvious.The attenuation of guided wave energy in clay environment is much higher than that in sandy environment.