FDTD数值模拟在GPR管线探测中的应用

发布时间：2018-03-25 02:07

本文选题：探地雷达　切入点：管线探测　出处：《地球物理学进展》2017年04期

【摘要】：探地雷达是一种非常重要的管线探测技术,为了提高地下管线雷达图像特征的认识,确定管线异常体的位置,提高雷达资料的解释精度.论文从Maxwell两个旋度方程出发,推导了二维TM波的差分方程、CFL数值稳定性条件、频散关系.然后,基于Matlab平台编写了探地雷达正演的FDTD程序,应用该FDTD程序开展了管线探测中探地雷达探测效果分析,包括对管线埋藏深度、管线间距、管线内物质、管线材质等影响因素的数值模拟.通过分析雷达正演剖面特征,可以清晰了解并掌握雷达管线探测与各种影响参数之间的关系,对实际地下管线探测可起到指导作用.最后,将GPR应用于武广高速浏阳河隧道管线探测中,GPR准确地定位了PVC通迅电缆的位置在埋深,为工程施工与处置提供了依据.
[Abstract]:Ground penetrating radar (GPR) is a very important pipeline detection technology. In order to improve the recognition of image features of underground pipeline radar, determine the location of pipeline anomaly and improve the interpretation accuracy of radar data, this paper starts from the Maxwell two curl equations. The numerical stability condition and dispersion relation of two-dimensional TM wave are derived. Then, based on Matlab platform, the forward FDTD program of ground penetrating radar is compiled, and the effect of ground penetrating radar detection in pipeline detection is analyzed by using the FDTD program. By analyzing the characteristics of radar forward section, we can clearly understand and master the relationship between radar pipeline detection and various influence parameters, including the buried depth of the pipeline, the distance between the pipeline, the material inside the pipeline, the material of the pipeline, the material of the pipeline, and so on. Finally, the application of GPR in the pipeline detection of Wuguang high speed Liuyang River tunnel can accurately locate the position of PVC communication cable in buried depth, which provides a basis for engineering construction and disposal.
【作者单位】：中南大学地球科学与信息物理学院;有色金属成矿预测教育部重点实验室;
【基金】：国家自然科学基金资助项目(41574116) 中南大学创新驱动项目(2015CX008)共同资助
【分类号】：P631.3;TU990.3

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