Abstract:Urban road collapse, as a typical sudden geological disaster, poses a serious threat to traffic operation safety and public life and property. Based on the multiple collapse cases in Shanghai and combined with the relevant academic research results, an investigation technology system, a multi-factor coupling mechanism and a hierarchical disposal technical framework are systematically built for urban road collapse accidents. The research shows that the core inducing factors of collapse accidents include the water and soil loss caused by underground pipeline damage, the erodibility of special geological conditions (such as sandy silt), external load disturbances (overloaded vehicles, construction vibration), and long-term uneven settlement. The investigation work needs to integrate multi-dimensional technologies such as data verification, geological survey, geophysical detection and pavement structure evaluation. The mechanism analysis should reveal the collapse evolution process from both macroscopic (hydrodynamic action, load effect) and mesoscopic (particle loss, fabric deterioration) levels. The disposal technology needs to adopt combined measures such as grouting reinforcement, excavation and replacement, and long-term monitoring according to the classification of diseases.
