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Abstract:
DInSAR and SBAS InSAR are two InSAR techniques commonly used for ground subsidence monitoring in mining areas. Taking the ground subsidence of a mining area in Jinan, Shandong province as the research object. Using DInSAR and SBAS InSAR to process 28 Sentinel-1A SAR images covering the mining area, the ground subsidence information of the mining area was obtained from July 2018 to June 2019. Based on the mining information of the mining faces and the monitoring data of leveling during the same period, the monitoring accuracy and ability of the two InSAR techniques are compared, analyzed and verified qualitatively and quantitatively. It was found that there was a little difference between DInSAR, SBAS InSAR and leveling monitoring results at the edge of subsidence basins, which could better reflect the actual situation of mining subsidence, while there was an obvious difference between DInSAR, SBAS InSAR and leveling monitoring results in the center of subsidence basins, and the monitoring ability was insufficient. In comparison, DInSAR technology is more reliable in monitoring fast and large deformation in the subsidence center of the mining area, and SBAS InSAR technology is more accurate in monitoring slow and small deformation around the mining area. The curves of the absolute difference between the DInSAR, SBAS InSAR and the leveling monitoring deformation values showed the features that the absolute difference was little at the edge of the subsidence basins and was great in the center of the subsidence basins, which can provide an important reference for the subsequent study on the correction method of the deformation values monitored by DInSAR and SBAS InSAR.
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