考虑介质随机性的土坝病害探地雷达波场特性研究

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

探地雷达(GPR)已被广泛用于土坝病害的无损检测。然而,土坝病害 GPR 的正演模拟通常采用分层均质模型,忽略了介质随机性对其波场特性的影响。因此,考虑到介质的随机性,建立了基于混合型自相关函数和有限元时域法的土坝病害地质电学模型。分析了随机介质模型参数对 GPR 单通道波的影响。探讨了不同介质模型下的电磁波传播特性。对土坝病害(如面板空隙、集中渗流和松动)的 GPR 进行了正演模拟。比较了均匀介质模型和随机介质模型在土坝病害传播特性上的差异。与均匀介质模型的计算结果相比,随机介质模型中电磁波的传播速度和振幅发生了变化,出现了一些衍射波。在对土坝病害进行 GPR 正演模拟时,考虑介质随机性可以加深对 GPR 断面视图的理解,有助于提高图像判读的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on ground-penetrating radar wave field characteristics for earth dam disease considering the medium randomness
Ground-Penetrating Radar (GPR) has been widely used for non-destructive testing of earth dam disease. However, the forward simulation of GPR for earth dam disease often employs layered homogeneous models, neglecting the influence of medium randomness on its wave field characteristics. Therefore, considering the randomness of the medium, a geoelectrical model for earth dam disease is established, which is based on the mixed-type autocorrelation function and the finite element time-domain method. The influence of random medium model parameters on the single-channel wave of GPR is analyzed. The electromagnetic wave propagation characteristics under different medium models are explored. The forward simulation of GPR for earth dam disease such as panel voiding, concentrated seepage, and loosening are performed. The differences in propagation characteristics for earth dam disease between uniform medium model and random medium model are compared. Compared to the calculation results of the uniform medium model, the propagation speed and amplitude of electromagnetic waves in the random medium model changes, and a number of diffraction waves are present. When performing forward simulation of GPR for earth dam disease, considering medium randomness can deepen the understanding of the GPR section view and help improve the accuracy of image interpretation.
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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