Monitoring And Analysis Of Residual And Abnormal Settlement Of Old Goaf In Fengfeng Mining Area Based On InSAR

After the mining of the mining area,the subsidence caused by mining still exists.Moreover,the abnormal deformation of the surface of the mining area caused by mining is difficult to monitor.InSAR technology has a broader prospect and a larger research space in the surface subsidence of the old goaf and the monitoring of the surface deformation of the mining area due to its all-weather all-day and wide-coverage monitoring advantages.Through the explanation of the basic principles of InSAR and time series InSAR,this paper describes the processing flow of SBAS technology step by step;processes the InSAR image of Fengfeng mining area;solves the abnormal deformation area InSAR data for the phenomenon of abnormal damage of surface buildings in mining area.The time series analysis of the deformation map obtained by the solution is carried out,and the results obtained by the analysis are discussed.The specific work is as follows.(1)Using SARscape to solve the RADARSAT-2 data of several existing Fengfeng mining areas,and obtain the deformation information map of the area.(2)Using ArcMap,the deformation region in the obtained deformation information map is drawn,and the position of the old goaf is obtained.The time series analysis of the deformation data of the old goaf is carried out,and the time series settlement law of the old goaf is obtained.(3)Further tailoring and solving the InSAR monitoring data of the abnormal deformation area in the Fengfeng mining area,obtaining the deformation information map of the abnormal deformation area;performing time series analysis on the deformation map,identifying the abnormal deformation area and the influence range of the abnormal deformation,and the deformation map and The abnormal deformation distribution information of the mining area is superimposed and displayed to verify the reliability of the InSAR technology to identify abnormal deformation.Analyze the geological survey data in the abnormal deformation area to determine the cause of the abnormal deformation.Experiments show that the time series InSAR monitoring can be applied to identify the deformation area and influence range of the old goaf with short stoppage time;the change rate of settlement rate in the subsidence basin of the old goaf can be obtained,and then the goaf can be judged.The length of time and the tendency to sink.The time-series InSAR technology can identify the range of influence of abnormal deformation caused by fault activation caused by mining face in mining area,and can be used for large-scale abnormal deformation identification and monitoring in this area.This result can be applied to the stability evaluation of old goaf and the prevention and monitoring of abnormal surface deformation in mining areas.