Research On Mining Subsidence Monitoring Method Based On Single Line Of Sight D-InSAR Technology

Differential interferometric synthetic aperture radar(D-InSAR)is an important method for surface deformation monitoring in mining areas.This technique has made up for the inadequacies of traditional technology monitoring mining subsidence with its advantages of all-weather,all time,strong penetration ability,can quickly acquire real-time,high precision,and large area of subsidence basin range and deformation field.It can provide very important help for domestic and foreign scholars to study the temporal and spatial variation of mining subsidence in mining areas.However,the traditional single line of sight D-InSAR technology can only obtain the distortion value of the line of sight(LOS,Line of Sight),which monitoring results can not reflect the real three-dimensional surface deformation.It easy to cause misjudgement or misjudgement of the surface deformation monitoring information,which makes the development and application of the technology greatly hindered,and seriously restricts the D-InSAR technology in the mine.The extension and application of deformation monitoring.To solve this problem,this paper integrates the principle of single line of sight D-InSAR imaging and mining subsidence prediction theory,and studies the method of monitoring the surface movement and deformation of mines based on single line of sight D-InSAR.The main achievements are as follows:(1)Through the analysis of the current domestic research status of mine InSAR monitoring.Literature studies show that the current SAR-based mine deformation monitoring technology has obvious deficiencies in wide adaptability mining subsidence monitoring model,full probability integral prediction parameter inversion method,mining subsidence large deformation gradient monitoring theory and so on,which seriously restricts the popularization and application of InSAR technology in the field of mine deformation monitoring.In view of the above deficiencies,this article focuses on the "mining monitoring method based on single line of sight" as the research content,and formulates a detailed research plan and research technical route.(2)The defects of the current mine InSAR deformation monitoring methods are analyzed through theoretical,experimental and simulation methods.Currently,D-InSAR monitoring based on single line of sight can only capture the LOS deformation at the surface of the mining surface,and it cannot accurately monitor the three-dimensional deformation of the surface.At the same time,the D-InSAR verification experiment based on the two track method was carried out,and the historical deformation field of the 1613 working face of Guqiao South Mine from October 23,2017 to January 15,2018 was successfully obtained.The experimental results show that the conventional D-InSAR technique can be used to monitor the deformation along the LOS direction within the range of deformation gradient allowed by D-InSAR.In the theory and technology of surface three-dimensional deformation monitoring of mines,on the one hand,the reasons why the traditional three-dimensional deformation monitoring methods are not applicable to mine subsidence monitoring are analyzed.On the other hand,theoretical derivation and experimental verification of D-InSAR LOS deformation is the vector sum of the projection vector of subsidence component and horizontal movement in north-south direction and east-west direction along the direction of the satellite line of sight.This will provide theoretical support for the follow-up research on the monitoring method of mining subsidence based on single line of sight InSAR.(3)Constructing the model of surface movement and displacement extraction from inclined coal seam mining based on single line of sight D-InSAR technology.This paper analyzes the satellite imaging process through the above-subsidence basins and the distribution of SAR image pixel arrays to find the relationship between deformation and subsidence of the D-InSAR LOS,horizontal movement in the north-south direction and horizontal movement in the east-west direction,combined with the subsidence laws of the inclined coal mining.Under the assumption that the first row and the first column of the image are moving horizontally to zero,a model for extracting the surface movement deformation of the inclined coal seam mining based on the D-InSAR technique is constructed.Taking the geological mining conditions of Huainan coal seam as background,a simulation experiment was constructed with TerraSAR-X data as an example.The simulation experiments show that the model constructed in this paper can extract subsidence and horizontal movement caused by mining in a more accurate manner.Taking the data of 1613 and Sentinel-1A SAR image in Guqiao south mine of Huainan city as an example,the model constructed in this paper was applied to engineering examples.The results show that the model constructed in this paper can extract the subsidence and horizontal movement more accurately from the D-InSAR LOS to the deformation field.Finally,using the constructed model,we successfully monitored the advance influence angle caused by mining at the 1613 working face of the Guqiao south mine during the period of 20171023-20180115,and analyzed and verified the law of advance influence angle.The results show that the advanced influence angle of mining area can be accurately calculated by using the inversion value established by the model established in this paper.(4)Constructing a probability integral parameter inversion model of simulated annealing based on single sight to D-InSAR.At present,the difficulty of inversion method for mining three-dimensional deformation based on probability integral method is how to retrieve probability integral parameters based on LOS deformation.By analyzing the projection relationship between the deformation of D-InSAR LOS and the three dimensional deformation of the mining area,combined with the prediction model of mining subsidence probability integration,based on nonlinear programming theory,the simulated annealing algorithm based on single line of sight D-InSAR is constructed to inverse the probability integral parameters.Taking the geological mining conditions of Huainan coal seam as background,a simulation experiment was constructed with TerraSAR-X data as an example.The simulation experiment shows that the model established in this paper can accurately obtain all the probability integral parameters of the mine area and has good robust performance.Finally,taking the 9310 working face and TerraSAR-X data of Nantun mining area of Yanzhou as examples,the model constructed in this paper is applied to the engineering example.The results show that the model constructed in this paper can obtain all probability integral parameters of the working face accurately.