Abstract
High-intensity coal mining (large mining height, shallow mining depth, and rapid advancing) frequently causes large-scale ground damage within a short period of time. Understanding mining subsidence under high-intensity mining can provide a basis for mining-induced damage assessment, land remediation in a subsidence area, and ecological reconstruction in vulnerable ecological regions in Western China. In this study, the mining subsidence status of Shendong Coalfield was investigated and analyzed using two-pass differential interferometric synthetic aperture radar (DInSAR) technology based on high-resolution synthetic aperture radar data (RADARSAT-2 precise orbit, multilook fine, 5 m) collected from 20 January 2012 to June 2013. Surface damages in Shendong Coalfield over a period of 504 days under open-pit mining and underground mining were observed. Ground deformation of the high-intensity mining working faces 22201-1/2 in Bu’ertai Mine, Shendong Coalfield was monitored using small baseline subset (SBAS) InSAR technology. (1) DInSAR detected and located 85 ground deformation areas (including ground deformations associated with past-mining activity). The extent of subsidence in Shendong Coalfield presented a progressive increase at an average monthly rate of 13.09 km2 from the initial 54.98 km2 to 225.20 km2, approximately, which accounted for 7% of the total area of Shendong Coalfield; (2) SBAS-InSAR reported that the maximum cumulative subsidence area reached 5.58 km2 above the working faces 22201-1/2. The advance speed of ground destruction (7.9 m/day) was nearly equal to that of underground mining (8.1 m/day).
Highlights
Shendong Coalfield is one of the largest coal production bases in the world
The temporal baseline of the cumulative differential interferometric synthetic aperture radar (DInSAR) interferometry increased continuously from the initial 24 days to the final 504 days (Figure 4b), which indicated that the influence of temporal decorrelation increasingly intensified
Interferometry was performed on each image pair according to their connection relationship based on the aforementioned optimized according to their connection relationship based on the aforementioned optimized baselines of small baseline subset (SBAS), image pair according to their connection relationship based on the aforementioned optimized baselines of SBAS, andwere interferograms were obtained
Summary
The high-density fields and high-intensity mining in Shendong Coalfield will profoundly influence the ecological environment of northwestern China. Assessing mining-induced damage and understanding mining subsidence in the high-intensity mining environment of Shendong Coalfield are important for the land remediation and ecological reconstruction of mining subsidence areas. 2016, 8, 951 monitoring approaches mainly include geodesy, global navigation satellite system measurements, and electronic distance measurements. Differential InSAR (DInSAR), as an extension of InSAR in terms of monitoring ground deformation, is mainly used to capture centimeter-level or smaller ground deformations along the line of sight (LOS) of a radar satellite. DInSAR technology can cause interference decorrelation for mining subsidence with immense deformation and short deformation period
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
