Monitoring and analyzing the development trend of land subsidence in Changzhou City, Jiangsu Province

Land subsidence is one of the main geological hazards in the urban area of Changzhou City, and it is also an important environmental geological issue that restricts the economic development of Changzhou City. To improve disaster prevention and mitigation, a three-dimensional monitoring network of land subsidence, which combines point-line-surface methods, has been established. This network utilizes various monitoring technologies such as In-SAR monitoring, GPS monitoring, primary level measurement, bedrock standard and layered standard, optical fiber monitoring hole, etc. The monitoring network has significantly enhanced the accuracy and reliability of land subsidence monitoring in Changzhou. Based on the results of the urban geological survey in Changzhou, the development process of land subsidence in recent decades has been systematically summarized. Using the subsidence deformation data obtained by the established multi-method monitoring network, the development trend of land subsidence in the urban area of Changzhou, the distribution of key subsidence areas, and the main subsidence layers and causation mechanism have been determined. Finally, suggestions for land subsidence prevention and control in Changzhou City have been proposed, providing a reference for future land subsidence monitoring and prevention and control work in urban geological surveying.