Study On The Subsidence Monitoring In Mountainous Coal Mining Area With Timing InSAR Technology

Surface subsidence caused by coal resources mining, has been hampered socialand economic development, and threatening the safety of the residents’ productionand life. Monitoring surface subsidence caused by coal mining effectively and quicklyin real time is an important issue for mining surveying and mapping technicians andtiming InSAR technology is with great potential in this area. This paper supported bynational Natural Science Foundation and enterprises projects and combined practicein Tunlan mine of Xishan coalfield Gujiao mining area, studys on monitoring systemof coal mining subsidence in mountain areas based on the timing InSAR technology,which is to inverse mining subsidence information and parameters against dynamicevolution. It shows that the subsidence information is much consistent with the GPSmeasured values. The main work and contents are as follows:1) Interferometric phase composition is analyzed after the systems description ofInSAR technology model, and contributions to the sensitivity of the interferometricphase for surface deformation, satellite orbit error, atmospheric delay error and DEMerror are analyzed. The two-pass method for D-InSAR measurement principle isintroduced and the main data processing of open source software Doris is analyzed.2) The principles and methods of multi-baseline D-InSAR interferogramsuperposition are analyzed, with proposing three key technologies for implementingthe method. Establishment of high-resolution high-precision DEM after generatingTIN used aerial topographical map data for transforming. Precise baseline estimateswith using high-coherent point target as ground control points. Masking in the miningsubsidence area is raised and then build linear models to estimate the heightassociated atmospheric delay phase to achieve the removal of atmospheric phase noise.Gujiao timing mining subsidence information and sinking contour surrounding theface is obtained with processing21TSXs from2012.4.4to2012.11.21.3) Analyzing the single-baseline IPTA multi-baseline StaMPS SBAS technicalprinciples and key algorithms, we get the Tunlan point target rate distribution of andtiming subsidence information using21TSXs from2012.4.4to2012.11.21. For IPTA,the maximum subsidence rate of LOS direction is-106.3mm/a and the maximumsubsidence for every11days is from-6.9mm to-1.0mm, while for the StaMPS SBAS,the maximum subsidence rate of LOS direction is-128.3mm/a and the maximumsubsidence for every11days is from-9.7mm to-1.0mm. Both methods can effectively determine the scope of surface mining-affected but can not get thesubsidence information of the central region on the face. Comparing the IPTA,StaMPS SBAS and GPS measurements, their timing cumulative volume trend areconsistent but the timing SAR results are much smaller than GPS technology andIPTA, StaMPS SBAS results with an average error of40.3mm,26.3mm.4) Using GPS-CR points to optimize geocoding for stacking precision guaranteeof mining working face information with time series results of InSAR in ArcGIS.Application of ArcGIS spatial overlay analysis to study ground surface deformationcharacteristics of mining subsidence with the the face forward, and then the advancedangle of influence and boundary angle of face are inversed. Using the GPS results onthe corner reflectors for quantitative validation, it indicates that the timing InSARtechnology has the ability to monitor micro-deformation of mining area.