Land subsidence is a geological disaster caused by natural or human factors, and its irreversible impact can continue to occur, causing great harm to human life. In our country, coal mining is mainly divided into open-pit mining and underground mining. Jiaozuo City, as a resource-based city, mainly relies on coal mining for development. The coal industry group in its jurisdiction has chosen underground mining. Long-term mining has resulted in many mines. Geological environment Problems are mainly manifested as ground subsidence, ground fissures, collapses, landslides, debris flows， and other phenomena.

Traditional land subsidence monitoring technologies mainly include leveling and GNSS monitoring technologies, but these two technologies are less efficient in large-scale, long-term, and continuous land subsidence monitoring. The InSAR technology developed in recent years can realize high-precision and large-scale ground deformation monitoring, and has become the mainstream subsidence monitoring technology.



In this paper, the short-baseline interferometric SBAS (Small Baseline Subest) measurement technology is used to monitor the settlement of the urban ground in Jiaozuo. There is no snow or rain in the city, and the space baseline and time baseline meet the requirements of a total of 24 Sentinel-1A images from 2018 to 2019. The orbit direction is ascending orbit, the working mode is IW, the polarization mode is VV, the data product is SLC, and the ground resolution is 5×20m. Accuracy analysis and evaluation of InSAR interpretation results are carried out. The results showed that the maximum annual average subsidence rate monitored by InSAR in Jiaozuo City from 2018 to 2019 was 51.20mm/yr, the minimum subsidence rate was -76.32mm/yr, and the average subsidence value was -1.76mm/yr. On the whole, the surface of Jiaozuo's central urban area is relatively stable, and the cumulative deformation is within the normal deformation range. The areas with severe subsidence mainly occur in the coal mining area in the northeast of Jiaozuo City, where the frequency of coal mining is high and the human factors are obvious, so it is in line with the actual situation. Discuss the distribution of land subsidence and its impact on the lives of local people, and then predict the development trend of land subsidence, and provide technical support for land subsidence prevention.



Our study demonstrates the effectiveness of InSAR technology for monitoring ground deformation in coal mining areas. The high spatial resolution and wide coverage of InSAR data can provide accurate and timely information for management decisions of coal mining activities. The results of this study can help local authorities better understand the characteristics and patterns of ground deformation in Jiaozuo City and develop effective strategies to manage the associated risks.