Applications of DInSAR for Measuring Mine-Induced Subsidence and Constraining Ground Deformation Model

摘要

Differential Interferometric Synthetic Aperture Radar (DInSAR) was used to measure subsidence above an underground longwall mine in Book Cliffs coal field Utah. DInSAR is a remote sensing technique capable of producing high-density displacement maps with sub-centimeter accuracy. In this study several SAR images covering an area of the West Ridge mine were used to produce displacement maps of the three-dimensional subsidence troughs developed above the active longwall panels. The results were validated using traditional field methods and subsequently used for constraining a ground deformation model. DInSAR identified the maximum amount of subsidence as 1.1 meters, nearly identical to the 1.2 meters measured using survey-controlled photogrammetry. Time-lapsed DInSAR subsidence profiles were fit to the active longwall mining sequence and were able to properly identify the dynamic progress of subsidence trough development above the extracted panels. Finally, DInSAR results were used to constrain a subsidence model and the result indicates that DInSAR is not only capable of providing high accuracy data for subsidence measurement but can also be used for model validation and improvement.