A Research On Time-series InSAR Method For Monitoring Land Subsidence In Mining Areas

Coal is an important energy source and plays an important role in the development of the national economy.After coal is mined,mining subsidence will happen in this area.In order to reduce the negative impact of mining subsidence,it is very necessary to monitor the ground in mining areas and research the law of mining subsidence.Synthetic aperture radar interferometry(InSAR)technology has the characteristics of full time,not affected by the climate,wide range the monitoring,the high precision,and the high temporal and spatial resolution.Compared with the traditional monitoring method,it has obvious advantages.The technology has been widely used in mine deformation monitoring.This paper studies the application of time-series InSAR method in monitoring land subsidence in mining areas.The main work includes the following aspects:(1)Taking the Datong coal field as the research area,using SBAS-InSAR technology to process 30 scenes of ALOS-1 data and RADARSAT-2 data covering the area,the deformation rate of the two types of data in the research area is obtained.The threshold of deformation rate for the ALOS-1 data is-20mm/a,for the RADARSAT-2data is-10mm/a.Compared these results with the mineral boundary.,the two have good consistency.At the same time,the subsidence area was verified in the field which explains the feasibility of applying time series InSAR technology to the identification of coal mining subsidence area.(2)A total of 40 satellite images of Sentinel-1A covering a coal mine in Lvliang were processed using SBAS-InSAR technology,and the maximum subsidence rate in the area was 311mm/a.At the same time,the slope curves rate and strike curves rate profile of the mining zone were analyzed.The change process of the subsidence curves of the two profiles is analyzed in chronological order,and several characteristic points are selected to analyze the change law of the subsidence value with time.The level data is used to compare the results of InSAR,which shows the reliability of the time-series InSAR technology applied to monitoring coal mining subsidence.(3)Using the results of time series InSAR method,combined with the finite mining prediction formula in the probability integral method,the whole work and the surrounding subsidence were simulated.