Monitoring And Analysis Of Surface Deformation In Mining Area Based On InSAR Technology

The surface subsidence induced by coal development has caused great damage to natural and surface buildings.Therefore,the monitoring and prediction of the surface movement and deformation of the mining area is of great significance.In the surface subsidence monitoring,the InSAR observation technology has the advantages of all weather and high precision compared with the conventional monitoring method.However,due to the limitation of time base line and large space distance,the application of InSAR has limitations in monitoring large scale deformation direction.CR-InSAR can solve the problem of decoherence to a certain extent,and it has a good prospect in the monitoring area of a large amount of deformation.In this paper,InSAR is used to observe the surface subsidence of the region,the evolution process of ground movement and the study of the law of movement deformation are carried out.The main contents and results of this paper are as follows:(1)Monitoring and analysis of surface subsidence in the research area based on D-InSAR The interference of five sets of data model RADARSAT-2 is used to do differential interference processing in SARscape software to obtain deformation information.Then we import the deformation map into ArcGIS,expand the spatial analysis,and map the settlement section of the working face to the line and the contour map of the whole area,and display it quantitatively and intuitively.The results show that the monitoring results are in accordance with the method of mining progress and grouting.(2)According to the research area,the research group has developed a portable satellite signal enhancement device.It is set up and installed in the research area,and the surface monitoring experiments are carried out by CR-InSAR technology and analyzed.The results show that the CR-InSAR technology and D-InSAR technology have obtained similar deformation results,and then verify its reliability and effectiveness.(3)To explore and analyze the law of surface movement and deformation in the experimentation area.First,based on the D-InSAR technology,the subsidence value,the sinking rate,the tilted deformation value and the curvature deformation value are extracted from the monitoring points of the working face.Comparison and analysis of the measured data with the leveling data.The azimuth variables are extracted by MAI technology,and it is found that the coherence of the deformable graph is different after the same interference pair passes through the D-InSAR and MAI data processing processes respectively.Then the differential interference deformation map is introduced into ArcGIS software processing analysis.The boundary area of surface movement basin in three time periods is obtained,and the moving parameters such as the advance influence angle of mining face and the boundary angle of the surface moving basin are obtained.(4)Calculation of the mobile prediction parameters by genetic algorithm.First,a set of parameters is set according to the experience value to calculate the subsidence value and the horizontal moving value.Then the estimated parameters are calculated by the genetic algorithm,using the value of the subsidence and the horizontal moving value as the initial value.The results of the calculation are compared with the experience value,which shows the validity and feasibility of the genetic algorithm in the calculation of the estimated parameters.