Investigation on Mining Subsidence Based on Multi-Temporal InSAR and Time-Series Analysis of the Small Baseline Subset—Case Study of Working Faces 22201-1/2 in Bu’ertai Mine, Shendong Coalfield, China

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 km 2 from the initial 54.98 km 2 to 225.20 km 2 , 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 km 2 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).

Time-Series Displacement of Landslide In Danba County (China) Monitoried By the Small Baseline Subset (SBAS) Technique

“…where δφ disp , determined by Equation (3), is the slant displacement phase between times tAand tB; δφ topo is the topographic phase error that is generated by external DEM; δφ atm is used to account for temporal atmospheric deformation obtained from different SAR acquisition; and δφ noise includes temporal decorrelation, orbital errors, thermal noise effects, etc [1].…”

“…Landslide, refers to the slope failure in response to the increased ratio of destabilizing shear stress to resisting shear strength [1]. Nowadays, landslide has become a global geological issue that menaces the natural environment of human beings.…”

Modeling 3D Free-geometry Volumetric Sources Associated to Geological and Anthropogenic Hazards from Space and Terrestrial Geodetic Data

“…The Lorca region, located in the Alto Guadalentín Basin of southeastern Spain (Figure 22), is affected by subsidence rates of up to 10 cm/yr as a direct consequence of long-term aquifer exploitation [5,[21][22][23][24][25][26][27][28][29][30][31] (Figure 22). This region is characterized by semi-arid climate conditions, with average precipitation rates of 150 mm/yr and an average annual temperature [105] of~18 • C. The basin is infilled with Quaternary alluvial fan systems overlapping Tertiary sediments transported by the Guadalentín River along the depression located in the eastern part of the Betic Mountain Range (an ENE-WSW oriented alpine orogenic belt resulting from the Nubia-Iberia ongoing convergence [106][107][108]).…”

“…Additionally, land subsidence, ranging from local collapse to the broad regional lowering of Earth's surface, represents the main geomechanical effect related to the removal of subsurface support [5]. Subsidence can occur as a result of (i) natural factors (e.g., tectonic activity, self-consolidation of recent sedimentary deposits, oxidation and shrinkage of organic soils) [18,19], and (ii) anthropogenic processes (e.g., groundwater pumping [20][21][22][23], urban development [24], hydrocarbon or mining exploitation [25,26]). Land subsidence associated with overexploitation of aquifers is a hazard that commonly affects large areas worldwide.…”

Earth Observations for Geohazards: Present and Future Challenges

“…Ma et al [41] study mining subsidence in Shendong Coalfield (China), suggesting that the extent of subsidence exhibits a progressive increase of 13.09 km 2 per month during the period from 2012 to 2013.…”