Comprehensive Investigation on Risk Assessment and Hidden Danger of Ground Collapse in Shanghai

Based on the analysis of the risk and vulnerability of the occurrence factors of ground collapse in Shanghai, the risk grade division of ground collapse geological hazards in Shanghai is formed, and the risk distribution of ground collapse in Shanghai is evaluated, which provides the direction for further comprehensive investigation of the hazards. Under the guidance of the division, Jing'an District was selected as the demonstration area to investigate and monitor the potential ground collapse hazards. 20 potential hazards were found and early warning monitoring were carried out. Monitoring suggestions were given for key potential hazard areas such as North Tibet Road Zhongxing Road, Pushan Cross Road Pushan Road, Tianmu West Road Meiyuan Road, etc. Risk division provides basis for risk management policies of each risk level area. The methods of hidden danger inspection, geophysical exploration and monitoring provide technical support for the prevention and control of surface subsidence in Shanghai, and provide reference for the prevention and control of surface subsidence in other cities.