Research On Monitoring Of Ground Subsidence In Mining Area Based On PS-InSAR And SBAS Technology

In recent years,land subsidence caused by the exploitation of underground coal resources has led to deformation of buildings and urban infrastructure in the region,destruction of underground aquifers,and reports of disasters such as conversion of cultivated land into wetlands,and local land resources,ecological environment and people's production.Life has had a serious impact.Therefore,the use of modern mapping technology to achieve large-scale regional surface deformation monitoring,through quantitative analysis to visually display surface deformation and trend development,and then the rational exploitation of coal resources and prevention of land subsidence caused by disasters have important practical significance and application value.This paper takes the representative coal mine of Shandong Province as the research area.Based on the current mainstream InSAR technology in the field of large-scale surface subsidence monitoring,the focus is on the problems of the InSAR technology,such as the loss of correlation and atmospheric delay,and the monitoring based on PS-InSAR and SBAS.The research on the method of land subsidence,and then obtain the average displacement rate and cumulative settlement of the surface of the study area,and realize the quantitative analysis of land subsidence.The main research contents and results are as follows:(1)Discussed the geometric principle of InSAR technology,introduced the basic principles of D-InSAR technology and analyzed the limitations of D-InSAR technology.The principle of PS-InSAR and SBAS technology is expounded,and the two technologies are compared and analyzed.(2)Describe the workflow of PS-InSAR and SBAS technology,and based on PS-InSAR technology and SBAS technology,the Sentinel-1A data of 36 scenes from July 2015 to December 2017 in a mining area in Shandong Province was processed and obtained research.The average displacement rate and time position sequence of the region,where the land subsidence rate is up to-139 mm/y.(3)Using the data and level data of CORS station in the period of 2015.07-2017.12 to verify the above results,it is found that the monitoring results of PSInSAR technology and SBAS technology are basically the same,among which the ground settlement information obtained based on SBAS technology is more accurate..(4)Through the exploration of the surface deformation characteristics of different areas such as mining area,mining face and groundwater in the test area,combined with the results of groundwater level monitoring in 2017,the main reasons for the settlement of the study area were analyzed.