Monitoring buried pipe deformation using acoustic emission: quantification of attenuation
Monitoring buried pipe deformation using acoustic emission: quantification of attenuation
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DOI：
10.1080/19386362.2016.1227581
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发表时间：
2017-08
影响因子：
1.9
通讯作者：
Alister Smith;N. Dixon;G. Fowmes
中科院分区：
文献类型：
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作者：
Alister Smith;N. Dixon;G. Fowmes
土体和土-结构系统的变形会产生声发射（AE），这是一种高频应力波。通过将传感器耦合到结构元件来倾听这种AE，可以提供有关资产状况的信息和加速变形行为的早期预警。有必要进行实验来模拟埋地管道系统中AE的传播，以增强对真实的行为的理解。解析解通常基于许多假设（例如均匀性、各向同性、边界条件和材料性质），并且不能准确地表示原位系统的行为。本文详细介绍了一系列的实验进行的埋地管道声发射衰减，由于耦合和土壤周围的管道。衰减系数报告提供指导工程师设计传感器间距沿着埋地管道监测地面变形，和主动波导安装深度的边坡变形监测。在20-30 kHz的频率范围内，空气-管道-空气和空气-管道-土壤三层系统的衰减系数已经被量化。
Deformation of soil bodies and soil-structure systems generates acoustic emission (AE), which are high-frequency stress waves. Listening to this AE by coupling sensors to structural elements can provide information on asset condition and early warning of accelerating deformation behaviour. There is a need for experimentation to model the propagation of AE in buried pipe systems to enhance understanding of real behaviour. Analytical solutions are often based on many assumptions (e.g. homogeneity, isotropy, boundary conditions and material properties) and cannot exactly represent the behaviour of the in situ system. This paper details a series of experiments conducted on buried pipes to investigate AE attenuation in pipes due to couplings and soil surround. The attenuation coefficients reported provide guidance to engineers for designing sensor spacing along buried pipes for monitoring ground deformations, and active waveguide installation depths for slope deformation monitoring. Attenuation coefficients have been quantified for both air–pipe–air and air–pipe–soil trilayer systems for the frequency range of 20–30 kHz.