探地雷达在公路改扩建工程检测中的应用

公路改扩建工程在广东省正处于快速发展时期,如何准确得到路面病害情况,是旧路处治方案制定面临的主要问题.依托开阳高速改扩建工程,采用三维探地雷达对旧路进行病害检测,得到道路表面及内部的病害分布情况,并分别与人工徒步调查路况及开挖后内部实际情况进行比对.结果表明:当三维探地雷达检测采样间距设置为2.0 cm、驻波时间设置为0.6 ms、时窗设置为85 ns时,可达到较好的检测精准度;三维探地雷达可实现对路面结构内部不同深度位置的裂缝病害进行探测,精确识别3 mm宽裂缝,并了解裂缝的发展方向及性质.

The Application of Ground Penetrating Radar in Inspection of Highway Reconstruction and Extension Projects

The highway reconstruction and expansion project is in a period of rapid development in Guangdong Province. How to accurately obtain the condition of the road surface disease is the main problem faced by the formulation of the old road treatment plan. Relying on the Kaiyang Expressway reconstruction and expansion project, the three-dimensional ground penetrating radar was used to detect the disease on the old road, and the disease distribution on the surface and inside of the road was obtained, and the road conditions were compared with the actual conditions after the manual walk and the excavation. The results show that when the 3D ground penetrating radar detection sampling interval is set to 2.0cm, the standing wave time is set to 0.6ms, and the time window is set to 85ns, better detection accuracy can be achieved; Detect cracks at different depths, accurately identify 3mm wide cracks, and direct the development direction and nature of the cracks.