Abstract:As a key component of infrastructure, the health status of urban drainage networks is closely related to the safe operation of cities. In recent years, the safety hazards such as soil loss, cavity development and road collapse caused by aging drainage networks have become frequent, seriously threatening the normal operation of cities. Starting from the working principle of geological radar, the geophysical characteristics of underground disease bodies caused by urban drainage network diseases, as well as the wave group characteristics presented by these characteristics in radar signals are deeply analyzed. At the same time, the signal characteristics of common electromagnetic interference in the detection process of drainage networks are summarized and concluded. Accurately identifying effective signals and eliminating interference signals during geological radar detection is the core key to improve the accuracy of geological radar interpretation. Combined with the practical engineering practice, the significant achievement of geological radar method in detecting the hidden hazards of leakage and rupture in drainage networks can provide the strong technical support for the safety assessment and maintenance of urban drainage networks.
