Research On Surface Subsidence Monitoring In Mining Areas Based On Sentinel-1A Data

Mining mineral resources is an important means to promote social and economic development.Long-term and high-intensity mining can cause a series of problems such as ground collapse and groundwater pollution,it is necessary to monitor the surface deformation of the mine in real time.The traditional methods of surface settlement monitoring are labor-intensive,with poor monitoring accuracy and low efficiency.InSAR technology has obvious advantages such as large range,all-time,high accuracy and low cost in monitoring surface deformation,and has become the mainstream way to monitor surface subsidence in mining areas.The conventional D-InSAR technique is unable to monitor the surface deformation for a long period of time due to spatial and temporal decoherence and atmospheric delay,etc.The time-series InSAR technique overcomes these defects and greatly improves the monitoring accuracy.In this paper,using Stacking-InSAR,StaMPSSBAS and SBAS-InSAR technology to monitor the surface subsidence in Laoshidan Coal Mine in Wuhai City and Xinjing Open-pit Coal Mine in Inner Mongolia,and the main work and results are as follows:1.For the situation that the specific location of Laoshidan Coal Mine is unknown,this paper uses Sentinel-1A images as experimental data and Stacking-InSAR technology to monitor the fast time-series deformation in Hainan District of Wuhai City.Finally,the geographic location of Laoshidan Coal Mine was determined and the deformation rate information was obtained.Using StaMPS-SBAS technology to repeat deformation monitoring of the Laoshidan Coal Mine,the initial StaMPS parameters were improved according to the actual conditions of the mine to improve the accuracy of deformation results.In response to the problem of atmospheric delays in the actual monitoring process of the Laoshidan Coal Mine,the traditional data processing process was improved by introducing external GACOS data for atmospheric correction before the phase unwrapped step.A graphical interface tool was developed to extract profile and time series point deformation information,which greatly improves the efficiency of StaMPS results analysis.According to the extracted deformation rate and time series deformation information,the settlement range,rule and trend of Laoshidan Coal Mine are analyzed in detail.Finally,the monitoring results of StaMPS-SBAS were compared with those of Stacking-InSAR and SBAS-InSAR for verification.2.In view of the serious incoherence problem of Xinjing Open-pit Coal Mine in Alxa Left Banner,Inner Mongolia,a joint Stacking-InSAR technology and SBAS-InSAR technology are proposed to monitor the surface deformation of mining area.Stacking-InSAR technology has obvious advantages in acquiring deformation rate information of Xinjing Open-pit Coal Mine,and SBAS-InSAR technology has good performance in acquiring temporal deformation information of Xinjing Open-pit Coal Mine.According to the deformation rate and time series deformation information,the surface subsidence of Xinjing Open-pit Coal Mine before the collapse is analyzed and verified by comparison with the existing monitoring results.