Research on road underground disease detection by dual-frequency GPR based on high-dynamic range technology
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摘要:
探地雷达(Ground Penetrating Radar, GPR)以其快速、无损和高分辨率等优势已被广泛应用于道路地下病害体的排查应用.针对传统时域单主频天线GPR在勘探深度和分辨率上的局限性，本文提出了一种基于双主频高动态GPR检测系统的道路地下病害检测方法，通过二维正演，模拟道路地下典型病害体的电磁响应，获得病害体的典型GPR特征图谱，为实际病害的客观判读和科学解译提供理论依据.并以某区道路地下病害的实测GPR数据为例，给出了双主频高动态GPR采集的参数设置及数据分析流程.钻探验证结果表明，高频回波信号对浅部薄层具有较高分辨率，能较清晰地识别3 m以上浅部病害体，低频回波信号具有较高信噪比，能有效识别3 m以下深部病害体，兼顾了探测深度和纵向分辨率的双主频GPR检测系统，能较好地识别地下病害类型、位置、埋深及影响范围，可为城市道路病害排查与防治提供技术支持.
Abstract:Ground Penetrating Radar (GPR) is widely used in the detection of underground diseases on roads due to its comprehensive, fast, non-destructive and high-precision advantages. At present, the detection depth of high-frequency antennas existing in traditional GPR is insufficient, while low-frequency antennas have low resolution, detection depth and detection accuracy.Can not take into account other issues, this paper proposes a dual-frequency GPR based on high-dynamic range acquisition system, taking into account the detection depth and detection accuracy of the road underground disease detection method.Through two-dimensional forward modeling, the response characteristics of typical road underground cavity diseases are simulated, and the GPR characteristic map of cavity diseases is initially obtained, which provides a theoretical basis for the interpretation of actual diseases.The results of drilling verification examples show that the high-frequency antenna two-dimensional GPR profile has a high resolution for shallow layers and can clearly distinguish underground diseases less than 3 m shallow.The low-frequency antenna two-dimensional GPR profile has a high deep signal-to-noise ratio and low noise level.It can clearly distinguish the disease bodies deeper than 3 m underground, which supplements the lack of detection depth of high-frequency antennas, and forms a comprehensive detection system that takes into account the detection depth and detection accuracy.It can more accurately identify the types of underground diseases, delineate their locations, and Buried depth and scope. The conclusions of the study can provide important technical support for the prevention and control of urban road diseases.
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图 2
不同填充类型的空洞正演模拟图
Figure 2.
Forward modeling of cavities with different filling types
图 3
不同大小的似圆形空洞病害体正演模拟结果
Figure 3.
Forward simulation results of three diseases of circular cavities of different sizes
图 4
不同形状的空洞病害体正演模拟结果
Figure 4.
Forward modeling results of cavities with different shapes
图 6
空洞及疏松病害体双频探地雷达二维剖面图
Figure 6.
Two dimensional profile of cavity and loose body by dual-frequency GPR
图 7
空洞病害体双频探地雷达二维剖面图
Figure 7.
Two dimensional profile of cavity disease by dual-frequency GPR
图 8
脱空病害体双频探地雷达二维剖面图
Figure 8.
Two dimensional profile of diseased body by dual-frequency GPR
表 1
路面地下不同病害体的探地雷达特征
Table 1.
The characteristics of GPR for different diseases on pavement underground
病害体类型 振幅强度 相位 雷达图像特征 空洞 整体振幅强 顶部反射波与入射波同向 多次波发育，绕射波明显 脱空 整体振幅强 顶部反射波与入射波同向 多次波发育，存在明显的同相轴脱落特征 疏松体 整体振幅强 顶部反射波与入射波同向 波形杂乱，同相轴错乱，多次反射较明显 富水体 顶部振幅强，能量衰减迅速 顶部反射波与入射波反向 顶部形成连续的反射波组，同相轴连续，反射能量较强，能量衰减较快 
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