地表起伏对地下管线GPR探测的影响  

Influence of surface undulations on GPR-based underground pipeline detection

作　　者：曾波[1] 刘硕 杨军 冯德山[2] 袁忠明 柳杰 王珣[2] ZENG Bo;LIU Shuo;YANG Jun;FENG De-Shan;YUAN Zhong-Ming;LIU Jie;WANG Xun(Guangzhou Urban Planning and Design Survey Research Institute,Guangzhou 510060,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Guangzhou Municipal Engineering Design&Research Institute Co.Ltd.,Guangzhou 510060,China)

机构地区：[1]广州市城市规划勘测设计研究院,广东广州510060 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]广州市市政工程设计研究总院有限公司,广东广州510060

出　　处：《物探与化探》2023年第4期1064-1070,共7页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(42074161、42104143);湖南省自然科学基金项目(2021JJ30806、2022JJ40584);湖南省研究生科研创新项目(CX20220188)。

摘　　要：地下管线是城市的重要设施,承担着能源输送、信息传递等功能,为城市生活提供了便利和保障。探地雷达(ground penetrating radar,GPR)作为一种高分辨率、高精度、非开挖、非破坏性的探测技术,在管线测量中具有巨大的优势。然而地表地形复杂,多有起伏,对于GPR探测地下管线有很大的影响。因此,本文采用有限单元法对地下管线探测进行了数值模拟,该方法可以与非结构网格结合,更好地拟合地表起伏地形;此外,介绍了如何进行高度校正,将所得剖面数据与地形相吻合,更容易分析异常体特征。最后开展了两个数值实验,分析了起伏地表对于不同埋深、不同间距、不同材质及不同填充物管线探测的影响,为GPR数据解释提供理论基础。实验结果表明,因地表起伏原因,波形和反射波能量将发生畸变,并不能作为判断管线信息的唯一依据。因此,需进行高度校正,利用双曲线的顶点来判断管线的埋深、材质等信息。As important urban facilities,underground pipelines perform the functions of energy transfer and information transmission,providing convenience and guarantee for urban life.Ground-penetrating radar(GPR),as a high-resolution,high-precision,trenchless,and non-destructive detection technique,has great advantages in pipeline surveys.However,undulating surfaces with complex terrain greatly influence GPR-based detection of underground pipelines.Therefore,this study conducted numerical simulations of the under-ground pipeline detection using the finite element method,which can be combined with an unstructured grid to fit the undulating sur-faces effectively.Furthermore,this study introduced the height correction method to match the obtained geologic sections with terrain,making it easier to analyze the anomaly characteristics.Finally,through numerical experiments,this study analyzed the influence of un-dulating surfaces on the detection of pipelines with different burial depths,spacings,materials,and fillers,providing a theoretical basis for GPR data interpretation.The experimental results show that waveforms and reflected wave energy,subjected to distortion due to sur-face undulations,cannot be used as the sloebasis for judging pipeline information.Therefore,height correction is required,and the verte-xes of hyperbolas can be used to judge the burial depths and materials of pipelines.

关 键 词：探地雷达 管线探测 地表起伏 有限单元法 高度校正 

分 类 号：P631[天文地球—地质矿产勘探]