埋地管道漏损检测的声传播特性研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (3) : 127-131.

论文

埋地管道漏损检测的声传播特性研究

严谨1，刘敬喜2，张娟1

作者信息 +

Characteristics of sound propagation in a buried pipe for leak detection

YAN Jin1, LIU Jing-xi2, ZHANG Juan1

Author information +

文章历史 +

摘要

地下管道漏损的准确定位问题一直是困扰世界范围内供水系统和市政建设的难题。管道漏损不仅会浪费大量的资源，而且还会造成严重的事故以及环境污染。针对埋地管道这样一个典型的土-管-液三相耦合问题，将管道周围土壤做弹性体考虑，对弹性介质中充液管道的声传播特性进行了解析研究。推导了低频域周向波数n=0的轴对称管道振动耦合方程，通过数值方法分别得到了流体波(s=1)和壳体压缩波(s=2)的复波数解。结果显示，管外土介质会使管道流体波波数减少(也即加快波的传播速度)，而对壳体压缩波的传播影响较小。由于管-土作用产生的能量辐射，在整个研究频段s=1波和s=2波都有较大的衰减。研究结果可为埋地管道漏损的精确检测提供理论支持。

Abstract

Since the loss of large amounts water through leak pipework system is both environmentally and economically damaging, accurate location of buried leakage pipes is a subject of waterworks and city planning construct in the worldwide major urban areas. For a buried pipe, it is a typically coupling system including three phases, i.e., soil, pipe and fluid. As the surrounding soil treated as elastic medium, characteristics of sound propagation are studied analytically for a fluid-filled pipe surrounding by elastic medium. Pipe coupling equations for n=0 axisymmetric wave motion are derived, and complex wavenumber solutions are obtained by numerical method for both s=1 wave and s=2 wave, which correspond to a predominantly fluid-borne wave and a compressional wave in the shell, respectively. The results show that the wavenumber of fluid-borne wave will decrease while nearly have no effect on compressional wave due to the existing of surrounding soil. Since the coupling between the pipe and the soil will result in energy radiation, larger attenuation arises for both s=1 wave and s=2 wave. It will give some help for leak detection of buried pipes.

导出引用

严谨;刘敬喜;张娟. 埋地管道漏损检测的声传播特性研究[J]. 振动与冲击, 2012, 31(3): 127-131

YAN Jin;LIU Jing-xi;ZHANG Juan. Characteristics of sound propagation in a buried pipe for leak detection[J]. Journal of Vibration and Shock, 2012, 31(3): 127-131