摘要
由充流管道泄漏引致并在管壁上传播的声波被称为泄漏固体声波,其中波速的确定是实现管道泄漏定位的关键。针对适合泄漏定位的低频段的T(0,1)模态、L(0,1)模态和F(1,1)模态,该文提出了一种基于低频简化频散方程的声波波速计算方法。该方法将低频简化的流体荷载和土体荷载施加于管道,从而建立了流体-管道-土体的耦合方程。不同模态的波速可以通过求解耦合方程来得到。以钢管、HDPE管和球墨铸铁管为对象进行算例研究,得到了三种管道在不同流体和土体工况下的频散曲线。结果表明,流体性质对波速的影响较小,而土体性质会对波速产生显著且复杂的影响。该文通过标定实验获取了埋地充水DN200球墨铸铁管的频散曲线。标定结果与所提出的计算方法的结果较为一致,这支撑了所提出方法的工程应用价值。
Leak solid acoustic waves are acoustic waves that are initiated by pipe leaks and propagate along pipe walls,and their wave velocities are critical to locating a pipe leak.For the mode T(0,1),mode L(0,1)and mode F(1,1)in the low frequency band suitable for leak location,a method is proposed for calculating the acoustic wave velocity based on the simplified low-frequency dispersion equations.The method applies simplified low-frequency fluid loads and soil loads to pipes,thus establishing the fluid-pipe-soil coupling equations.The wave velocities of the different modes can be obtained by solving the coupled equations.The dispersion curves of three pipe materials,namely steel,HDPE and,ductile iron,are calculated for different fluid and soil conditions.The results show that:fluid properties have a small effect on wave velocities,while soil properties can have a significant and complex effect on wave velocities.The dispersion curve of a buried water-filled DN200 ductile iron pipe is obtained through a calibration experiment.The calibration result is in a good agreement with the result of the calculation method proposed,which supports the engineering application value of the method proposed.
作者
刘泽龙
李素贞
黄耀华
LIU Ze-long;LI Su-zhen;HUANG Yao-hua(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《工程力学》
EI
CSCD
北大核心
2024年第9期155-166,190,共13页
Engineering Mechanics
基金
国家自然科学基金项目(51878509)
国家重点研发计划课题项目(2016YFC0802406)。
关键词
充流管道
泄漏
声波波速
频散曲线
理论求解
实验标定
fluid-filled pipeline
leakage
acoustic wave speed
dispersion curve
theoretical calculation
experimental calibration
