Monitoring And Analysis Of Surface Deformation In Old Goaf Based On InSAR

The surface deformation caused by the old goaf,may cause surface subsidence,landslides and cracks and other secondary disasters,thus affecting the regional economic development,threatening the safe production of coal mining area and the safety of life of the residents.Therefore,it is important to monitor and analyze the surface deformation of the old goaf,determine the deformation area,master the deformation trend,provide the data support for the comprehensive management of the deformation area,and it is of great significance to the disaster prevention and reduction in the mining area.For the monitoring methods are the level of measurement,GPS measurement and other traditional measurement methods and InSAR technology measurement methods.However,the slow measurement of the traditional measurement method,high cost,the amount of information and the amount of data affected by the number of monitoring points and other shortcomings hinder the implementation of surface deformation monitoring of the old goaf.For the InSAR technology has the advantages of monitoring the small deformation of surface,high precision,large monitoring range,more flexibility in the surface deformation monitoring neighborhood,it has been widely used.So this experiment is based on Sentinel1A data,using the timing SBAS-InSAR technology in the InSAR technology to obtain the surface deformation results of the Sandaogou mining area,combined with 85201 face data of the old goaf in the mining area,analyzing the deformation characteristics and deformation of the old gob from 16 July 2015 to 23 May 2016.The experimental results show that the deformation of 85201 face of the old goaf decreases with the increase of the time in the study time range,and the average deformation is-10.87 mm in 312 days;After 312 days,the study area showed that for the cumulative deformation in the direction of the goaf,that of south was smaller than that of the north and middle,and the cumulative deformation in the tendency direction was gradually rising from west to east.The deformation results show that 85201 face of the old goaf is in a relatively stable stage.