Characteristics Analysis of Ground Penetrating Radar Signals for Groundwater Pipe Leakage Environment
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摘要: 探地雷达(GPR)在地下水管渗漏的检测中具有良好的应用前景。前期研究表明：地下水管的渗漏会在雷达剖面中形成震荡信号，但其形成机理尚不明晰。为揭示不同材质地下管道渗漏后的探地雷达信号特征的成因，该文结合物理模型试验与渗流场-电磁场数值模拟分析干砂中PVC管和金属管渗漏前后雷达信号特征、渗漏后震荡信号的形成机理和电磁波传播路径。结果表明：地下水管发生渗漏后，管道周围区域出现一定分层状态，电磁波在传播过程中存在更多界面反射和界面间的多次波。PVC管渗漏后，管道顶部、底部反射信号和爬行波信号在渗漏区中多次反射形成复杂的震荡双曲线信号，而金属管渗漏后管壁与渗漏区间存在多次反射。研究成果可为探地雷达在地下水管渗漏探测实际应用提供技术支持。Abstract: Ground Penetrating Radar (GPR) has a good prospect in the detection of underground water pipeline leakage. Previous studies have shown that the underground water pipes leakage can form oscillating hyperbolic signals in GPR profile, but its formation mechanism is not clear. To reveal the formation mechanism of GPR signal characteristics after underground pipeline leakage of different materials, physical model test and multi-physics numerical simulation are carried out to analyzes the characteristics of GPR signals before and after leakage, the formation mechanism of oscillating hyperbolic signal of PVC/metal pipe after leakage and the propagation path of electromagnetic wave. The results show that a stratified leakage zone appears around the underground water pipe after leakage, and more interface reflections and multiple waves bouncing between interfaces occur during the propagation of electromagnetic waves. After the leakage of PVC pipe, creeping wave signals and the reflected signals at the top and bottom of the PVC pipe are reflected many times in the leakage zone to form complex oscillatory hyperbolic signals, while there are multiple reflections between the pipe outer wall and the leakage zone after the metal pipe leakage. The results are helpful to promote the practical applications of GPR to underground pipeline leakage detection and related data interpretation.
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Key words:
- Ground Penetrating Radar (GPR) /
- Pipe detection /
- Leakage localization
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