地质雷达快速检测城市道路路基病害应用研究

Application of Ground Penetrating Radar in the detection of the subgrade defect of the urban road

路基病害定期检测是保证城市道路运行安全的重要措施,而地质雷达是路基病害快速检测的有效手段之一。文中对地质雷达的原理做了简单分析,建立了道路路基病害与雷达图谱的对应关系,并根据某市区主干路3个区段现场情况进行了地质雷达合理选型、参数设置和实地检测。检测结果表明,主干路第1区段存在3处可疑缺陷,雷达图谱反射信号能量有小幅变化,同相轴较不连续,波形结构较为杂乱、不规则,均判定为道路路基轻微疏松;主干路第2区段存在3处可疑缺陷,雷达图谱反射信号能量变化较大,同相轴较不连续,波形较为杂乱、不规则,均判定为道路路基中度疏松;主干路第3区段存在3处可疑缺陷,雷达图谱特征与第1区段相同,均判定为道路路基轻微疏松。检测结果为城市道路应急处置和预养方案制定提供了有力指导。

The regular inspection of urban road plays an important role in its normal operation. In this paper, subgrade defect detection is carried out in three sections of a main road in a city by using the ground penetrating radar. First of all, the principle of GPR is analyzed, and the corresponding relationship between subgrade defect and geotechnical radar image features is established. Then according to the specific situation of the detection area, the type and the specific parameters of the radar are set. Finally, the field test is carried out in the test section. The results show that： in the first detection area, there is a slight change of the radar spectrum in the three intervals. After identification, the subgrade within these intervals have occurred slight loose. In the second detection area, there is a dramatic change of the radar spectrum in the three intervals. After identification, the subgrade within these intervals have occurred the moderate degree of loose. In the third detection area, there is a slight change of the radar spectrum in the three intervals. After identification, the subgrade within these intervals have also occurred the slight loose. The test results can provide powerful guide for the emergency treatment and reasonable maintenance of urban roads.