Abstract
The urban road is the lifeline of urban development, and the safety of the underground space of the urban road is the foundation for people to travel happily. Based on the analysis and summary of the causes of safety risks in the underground space of urban roads, various abnormal figures detected by 3D ground penetrating radar (GPR) are listed, and the characteristics of abnormal images are analyzed, the results show that the reasons of unsafe factors in urban road underground space can be determined by using 3D GPR figure and auxiliary verification borehole camera, which can be used as a means of rapid safety monitoring of urban road underground space.
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