Research on the application of D-InSAR and SBAS-InSAR technologies in the monitoring of ground subsidence in mining areas

In order to compare and analyze the application of D-InSAR and SBAS-InSAR technologies in the monitoring of ground subsidence in mining areas, a mining face in Jining City, Shandong Province is selected as the main study area, and 26 Sentinel-1A data are collected from November 2, 2022 to August 29, 2023, and the ground subsidence of the working face is obtained by using D-InSAR and SBAS-InSAR technologies, firstly, the two technologies are compared and analyzed in terms of the spatial and temporal evolution characteristics of the subsidence area and the distribution of the deformation area, and then the results obtained by the two technologies are verified by the accuracy of the same period of measured level data. The results show that the maximum cumulative subsidence in the study area detected by D-InSAR and SBAS-InSAR technologies are 69 mm and 59 mm, respectively, and the areas with subsidence greater than 10 mm are identified to be 0.60 km² and 0.87 km², of which the areas with subsidence greater than 30 mm are 0.10 km² and 0.17 km², respectively. When centimeter-level subsidence occurs, the results obtained by the two technologies are compared and analyzed. When the ground subsidence reaches the decimeter level, both InSAR technologies are difficult to quantitatively reflect the real ground subsidence. Compared with the SBAS-InSAR technology, the D-InSAR technology obtains a larger value of cumulative subsidence, but its ability to resist the interference of errors is weaker, while the SBAS-InSAR technology is able to better eliminate the influence of errors such as the atmospheric phase effect, and the obtained results of the ground subsidence are more continuous and smooth in the spatial distribution. The research in this paper has some implications for the utilization of InSAR technology to monitor the ground subsidence in mining areas.