Deformation monitoring and analysis of Kunyang phosphate mine fusion with InSAR and GPS measurements

In order to prevent landslide and collapse in the mining area, it is essential not only to gain a full understanding of the surface defor-mation information about the open-pit mining area and surrounding dumps, but also to closely monitor the development of surface deformation. Small baseline set (SBAS) technology can be applied to extract the high-resolution spatial-temporal deformation informa-tion from the mining areas. Due to decoherence, however, it is difficult to obtain the effective information on deformation from some areas where the results are monitored. This paper proposes a kriging interpolation method that performs better in filling the missing values in the InSAR monitored results by integrating GPS measured data with InSAR monitored data. In the experimental process, 69 Sentinel-1 image data were collected from July 2018 to November 2020. The SBAS-InSAR technology was applied to monitor the surface deformation caused to the Kunyang phosphate mining area and surrounding dumping sites. It was found out that all the mining areas across the Kunyang Phosphorus Mine and the surrounding dumps suffered severe surface deformation, with the maximum line of sight (LOS) deformation rate of-132 mm/yr located in the dump in the north of the second mining area. The verification result shows that InSAR measurement results are consistent with the deformation estimated from GPS measurements. The root mean square error of most points is maintained within & PLUSMN;10 mm. The Kriging interpolation results of fusion GPS data are in good agreement with the GPS results. The root mean square errors at the 4 verification points are & PLUSMN;6.2 mm, & PLUSMN;4.6 mm, & PLUSMN;6.4 mm, & PLUSMN;7.8 mm. The method proposed in this paper is effective in filling in the missing values in the incoherent area, and can be applied to mine surface deformation monitoring with high reliability. The results of this paper serve as a scientific basis for the prevention and control of landslides, collapses and other hidden risks of geological disasters posed by the mining operations conducted in the Kunyang Phosphorus Mine. (c) 2022 COSPAR. Published by Elsevier B.V. All rights reserved.

Automated summary

To prevent landslide and collapse in the mining area, it is important to understand the surface deformation information and closely monitor its development. This paper proposes a method that utilizes SBAS technology to extract high-resolution deformation information and uses Kriging interpolation to fill in missing values in the monitoring results. Experimental results demonstrate the reliability and effectiveness of the method, providing a scientific basis for mine surface deformation monitoring.