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基于阵列超声成像法的混凝土裂缝深度检测技术研究
发布时间:2020-04-03 22:40:55      来源:未知
  摘要:针对传统超声法检测混凝土裂缝深度人为影响因素较多,检测效率十分低下,本文引入了阵列超声成像法,研究了阵列超声成像法检测裂缝深度的检测原理及其计算原理,并在实验室设计制作了一块预设七条不同深度裂缝的素混凝土试件,进行了跨单裂缝和试件整体成像检测试验。试验结果表明:阵列超声成像法根据缝底反射超声波的传播时间来检测裂缝深度,生成的2D图像可以显示缝底位置,但无法显示缝身;检测精度较高,并且随着裂缝深度加深逐渐提高;检测时应考虑边界效应,否则无法准确检测裂缝深度;检测时存在盲区,当缝底位于盲区内时会出现漏检。
关键词:阵列超声成像法;跨单裂缝成像检测;试件整体成像检测;缝底;缝身 
 
  Research on concrete crack depth detection technology based on array ultrasonic imaging method
 
 
  Abstract: As there are many artificial factors influencing the depth of concrete cracks detected by traditional ultrasonic method, the detection efficiency is very low. In this paper, array ultrasonic imaging method is introduced to study the detection principle and calculation principle of crack depth detection by array ultrasonic imaging method. In addition, a concrete specimen with seven cracks of different depths is designed and produced in the laboratory, and the test of cross-single crack and overall image detection of specimen is carried out. The test results show that: the array ultrasonic imaging method detects the crack depth according to the propagation time of ultrasonic reflected from the seam bottom, and the generated 2D image can display the position of the seam bottom, but not the seam body. The detection accuracy is high and gradually improves with the deepening of crack depth. Boundary effect should be considered in the detection, otherwise the crack depth cannot be accurately detected. There is a blind area in the detection, when the seam bottom is in the blind area, there will be missed detection.
  Key words: array ultrasonic imaging; Imaging detection across a single fracture; Whole specimen imaging test; Seam bottom; Sew the body
 

  混凝土是土木工程领域应用最广泛的建筑材料之一,其质量直接关系到建筑结构的安全。由于设计、施工管理及使用方面的原因,混凝土结构很容易形成不同程度的裂缝。裂缝的存在不仅会影响建筑物的美观和使用功能,同时也会让结构整体稳定性及耐久性面临威胁,严重者甚至引发安全责任事故。因此,必须对混凝土构件裂缝进行检测,准
确掌握裂缝的走势、宽度、长度和深度[1-4],以判断对建筑物的危害程度并研究相应补强措施[5]


  完整版请点击:CF13 基于阵列超声成像法的混凝土裂缝深度检测技术研究.pdf