探地雷达探测路床结构的正演模拟研究  

Forward Simulation Study of Roadbed Structure by Ground-penetrating Radar Detection

作　　者：秦卫军[1] 梁智超 Qin Weijun;Liang Zhichao(Jilin Institute of Transportation Science,Changchun 130000,China;College of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]吉林省交通科学研究所,吉林长春130000 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090

出　　处：《市政技术》2024年第3期106-109,123,共5页Journal of Municipal Technology

基　　金：吉林省交通运输创新发展支撑(科技)计划项目(2019-1-5各省级科技专项计划)。

摘　　要：土体的相对介电常数是表征土体介电特性和极化能力的重要参数。探地雷达发射的电磁波在道路各结构层的传播规律与层间介质的介电性质紧密相关。因此,从时域有限元法原理出发,利用正演模拟软件开展了针对路床层间电磁波回波特征的正演模拟研究。研究结果表明:面层的相对介电常数对探地雷达电磁波在路床层振幅衰减的影响较小;当路床层相对介电常数为20.0、24.0,面层相对介电常数由5.0增加至6.5时,路床层振幅衰减值分别增加了0.04、0.09 V/m;当路床层相对介电常数为20.0、22.0,基层相对介电常数由7.0增加至9.0时,路床层振幅衰减值分别减少了0.85、0.81 V/m;当基层相对介电常数为7.0、7.5、8.5,路床层相对介电常数由12.0增加至30.0时,路床层振幅衰减值分别增加了1.44、1.47、1.44 V/m。The relative dielectric constant is an important parameter characterizing the dielectric properties and polarizability of the soil.The propagation law of electromagnetic waves emitted from ground-penetrating radar(GPR)in each structural layer of the road is closely related to the dielectric properties of the interlayer medium.In this paper,based on the principle of time-domain finite element method,a forward simulation study is carried out for the characteristics of the electromagnetic wave echoes between the layers of the roadbed by the forward simulation software.The results show that the dielectric constant of the surface layer has less influence on the amplitude attenuation of GPR electromagnetic wave in the roadbed layer;When the relative dielectric constant of the roadbed layer is 20.0 and 24.0,the one of the surface layer increases from 5.0 to 6.5,the amplitude attenuation value of the roadbed layer increases by 0.04 and 0.09 V/m respectively;When the relative dielectric constant of the roadbed layer is 20.0 and 22.0,the one of the base layer increases from 7.0 to 9.0,the amplitude attenuation value of the roadbed layer decreases by 0.85 and 0.81 V/m respectively;When the relative dielectric constant of the base layer is 7.0,7.5 and 8.5,the one of roadbed layer increased from 12.0 to 30.0,the amplitude attenuation value of roadbed increases by 1.44,1.47 and 1.44 V/m respectively.

关 键 词：路床结构 探地雷达 介电常数 时域有限元法 路床层振幅衰减 

分 类 号：U415.12[交通运输工程—道路与铁道工程] TN959.71[电子电信—信号与信息处理]