Reflection characteristics and morphological recognition of underground cavity diseases based on 3D ground penetrating radar
Article Text (Baidu Translation)
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摘要: 针对三维探地雷达(3D GPR)在空洞病害反射特性领域研究的不足，采用gprMax正演模拟软件建立了包含多种形态特征(球体、正方体、三棱柱和不规则几何体)的道路结构空洞模型；通过对B-Scan剖面图像和C-Scan深度切片图像的反射特征进行机理分析和规律总结，提出了相应的辨识方法；以南昌市某城市道路为例进行了工程应用和开挖验证。研究结果表明：在二维剖面图像中空洞病害均呈现半双曲线特征，且空洞病害与测线的位置关系会影响半双曲线的显示深度；C-Scan深度切片图像更有助于显示空洞病害的外观形态，尤其是圆形空洞病害；在C-Scan深度切片图像中，空洞病害形状会随着时间深度的加深而逐渐变大；仅从B-Scan剖面图像中难以准确辨识空洞病害形态，需要结合C-Scan深度切片图像进行综合解译。提出的方法有助于提升3D GPR图像解释的准确性，实现对城市道路病害治理和预防塌陷的目标。Abstract: Aiming at the lack of research on 3D ground penetrating radar (GPR) in the field of cavity disease reflection characteristics, gprMax forward simulation software was adopted to establish a road structure cavity model containing various morphological features (sphere, cube, triangular prism, and irregular geometric body). Based on the mechanism analysis and rule summary of reflection characteristics of B-Scan profile image and C-Scan depth slice image, the corresponding identification method was proposed, and the engineering application and excavation verification were carried out by taking a city road in Nanchang City as an example. Analysis results show that in the two-dimensional profile image, the cavity diseases show the characteristics of a semi-hyperbola, and the position relationship between the cavity diseases and the survey line will affect the display depth of the semi-hyperbola. C-Scan depth slice images are more helpful to show the appearance of cavity diseases, especially the circular cavity diseases. In the C-Scan depth slice image, the shape of cavity diseases will gradually become larger as the time depth intensifies. Is difficult to accurately identify the morphology of cavity diseases from B-Scan profile images only, and it is necessary to combine C-Scan depth slice images for comprehensive interpretation. The proposed method helps to improve the accuracy of 3D GPR image interpretation and achieve the goal of urban road disease control and collapse prevention.
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图 5 16通道发射接收天线位置关系示意
Figure 5. Schematic of the position relationship between 16-channel transmit and receive antennas
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