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The realization of applying 3D frequency stepped ground penetrating to the detection of asphalt layer thickness |
Ze-Shan XU1, Jiang-Tao ZHOU2, Si-Xin LIU3, Xian-De ZENG4 |
1. Sichuan Jianye Project Quality Survey Co., Ltd., Chengdu 610213, China 2. Lanzhou Municipal Engineering Service Center, Lanzhou 730000, China 3. College of Earth Exploration Science and Technology, Jilin University, Changchun 130026, China 4. Xinjiang Electric Power Design Institute Co., Ltd., China Energy Engineering Group, Urumqi 830001, China |
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Abstract Because of its non-destructive and high-resolution characteristics, ground penetrating radar technology has been widely used in road nondestructive testing in recent years. The ground penetrating radar currently used for road asphalt layer thickness detection is mainly a high frequency single channel antenna above 1 GHz; compared with the traditional core sampling, it has the advantages of non-destruction and high efficiency, but its detection coverage is small, and there is a problem of line generation. In order to realize the full coverage non-destructive testing of asphalt layer thickness in the completion acceptance of Lanzhou municipal road project, the authors used three-dimensional stepped frequency space-coupled ground penetrating radar combined with the core thickness to verify its reliability in asphalt layer thickness detection. The authors analyzed the working principle and depth resolution of the stepped-frequency ground penetrating radar system and, based on the experimental results and acceptance examples of the three-dimensional stepped-frequency ground penetrating radar, consider that it is suitable for road asphalt layer thickness detection, and has the characteristics of intuitiveness, high efficiency and high resolution.
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Received: 03 January 2019
Published: 25 October 2019
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Frequency step pulse
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Road sign with raised road surface(The figure above is a vertical section and the figure below is a horizontal section)
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3D-radar on-site inspection
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Asphalt layer upper and lower interface reflection
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道路名 | 芯样厚度 /mm | 雷达检测厚度 /mm | 绝对偏差 /mm | 相对误差 /% | 1#路 | 184 | 183 | 1 | 0.54 | 2#路 | 177 | 174 | 3 | 1.69 | 3#路 | 80 | 81 | -1 | 1.25 | 4#巷 | 135 | 137 | -2 | 1.48 | 5#路 | 96 | 95 | 1 | 1.04 | 6#路 | 55 | 57 | -2 | 3.63 | 7#路 | 166 | 168 | -2 | 1.20 | 8#路 | 90 | 91 | -1 | 1.11 |
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Radar detection thickness value and core sample thickness value comparison
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A top and bottom interface of a data asphalt layer
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车道 | 平均厚度 /m | 平均厚度 /m | 总平均 厚度/m | 南向北1 | 0.119 | 0.124 | 0.123 | 南向北2 | 0.132 | 南向北3 | 0.121 | 北向南1 | 0.122 | 0.122 | 北向南2 | 0.119 | 北向南3 | 0.126 |
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XX road asphalt layer thickness radar test results
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Thickness map of asphalt layer in the first lane from south to north
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