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<p>The residual subsidence induced by coal mining activities leads to long-time ground subsidence and compromises the stability of surface structure. To provide a better understanding of the long-term residual subsidence during the post-mining period under different mining history and mining geology. In this study, PS-InSAR (Persistent Scatterers Interferometry SAR) technology was employed to assess the residual subsidence in Panel 1 of Huojitu mine for 6 representative longwall mining working faces (LW), using 174 ascending data of C-band Sentinel 1 images acquired from 2015 to 2023. The datasets were organized into six independent time series aligned with the mining conditions. The reliability of the PS-InSAR was verified with the Knothe time function model. Besides, the characteristics of residual deformation and relationships between subsidence and deformation of goaf were analysed. This study shows that the duration of residual surface subsidence of single coal seam mining without aquifer is approximately 12 to 14 years. The subsidence rates and accumulative subsidence are various in multiple coal seam mining. LW 12206 and 12,208 have significantly larger subsidence rate and cumulative subsidence than that of LW 12203. The rate of surface subsidence increased by 79.0% and 67.8% compared with LW 12203, respectively. The mining thickness, the mining size of the working faces, the destabilising damage of the coal pillar in the upper seam, and the recompaction of the broken rock in the mining void area are may the main controlling factors of the magnitude and intensity of the residual subsidence. This study established a foundation for more accurate predictions of long-term ground movements and planning of protective measures in mining-affected regions.</p>

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Ground residual subsidence during post-mining period based on Sentinel-1 and PS-InSAR technology: the Shendong coal field (China) case study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月31日

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  • Kangning Zhang,
  • Yixin Zhao,
  • Pierluigi Confuorto,
  • Sandro Moretti,
  • Gabriele Fibbi,
  • Chunwei Ling,
  • Duo Xu,
  • Jihong Guo,
  • Liangchen Zhao

摘要

The residual subsidence induced by coal mining activities leads to long-time ground subsidence and compromises the stability of surface structure. To provide a better understanding of the long-term residual subsidence during the post-mining period under different mining history and mining geology. In this study, PS-InSAR (Persistent Scatterers Interferometry SAR) technology was employed to assess the residual subsidence in Panel 1 of Huojitu mine for 6 representative longwall mining working faces (LW), using 174 ascending data of C-band Sentinel 1 images acquired from 2015 to 2023. The datasets were organized into six independent time series aligned with the mining conditions. The reliability of the PS-InSAR was verified with the Knothe time function model. Besides, the characteristics of residual deformation and relationships between subsidence and deformation of goaf were analysed. This study shows that the duration of residual surface subsidence of single coal seam mining without aquifer is approximately 12 to 14 years. The subsidence rates and accumulative subsidence are various in multiple coal seam mining. LW 12206 and 12,208 have significantly larger subsidence rate and cumulative subsidence than that of LW 12203. The rate of surface subsidence increased by 79.0% and 67.8% compared with LW 12203, respectively. The mining thickness, the mining size of the working faces, the destabilising damage of the coal pillar in the upper seam, and the recompaction of the broken rock in the mining void area are may the main controlling factors of the magnitude and intensity of the residual subsidence. This study established a foundation for more accurate predictions of long-term ground movements and planning of protective measures in mining-affected regions.