89 / 2023-05-19 17:45:27

Monitoring of large-scale surface subsidence in Shanxi Province

Land subsidence,InSAR,Mining Area,Shanxi Province

        Shanxi Province, as a major coal-producing province, has proved reserves of 267.4 billion tons of coal resources. With the large-scale continuous mining of coal resources, the ground subsidence caused by mining has caused great damage to the mining environment, so the long-term dynamic monitoring of surface deformation is of great significance for the development of mining subsidence and the sustainable development of mining economy.

        In this paper, interferometry synthetic aperture Radar (InSAR) technology is used to monitor large-scale subsidence of mining areas in Shanxi Province. Firstly, the multi-orbit sentinel-1A ascending orbit data covering Shanxi Province during 2017-2022 is processed with stacking technology to obtain the overall surface subsidence rate in Shanxi Province, complete large-scale surface subsidence detection in Shanxi Province, and sum up the spatial-temporal distribution characteristics of subsidence in Shanxi Province. Then, the small baseline set technology is used to focus on monitoring the Huodong mining area where mining subsidence is more serious. A total of 142 Sentinel-1A ascending track data covering the Huodong mining area from March 2017 to June 2022 are selected for sbas processing to obtain the fine subsidence rate and cumulative value of the Huodong mining area. The results show that the surface subsidence of Shanxi Province is spread all over Shanxi Province, and the coal mining subsidence areas are mainly concentrated in 6 prefectural level cities, Linfen, Luliang, Changzhi, Jincheng, Jinzhong and Datong. The subsidence distribution is highly overlapping with the mining area planning and goaf distribution in Shanxi Province. The maximum settlement rate of Huodong mining area is -140.423mm/a, the overall settlement is concentrated in the north of the mining area, and the settlement develops rapidly. Through verification with GNSS data of Shanxi Province, InSAR technology has high accuracy in mining subsidence monitoring, and can provide accurate and timely information for the development of coal mine subsidence.