Surface Subsidence Monitoring Of Jinchuan Mining Area In Gansu Based On Space - Air - Ground Integration

Nickel ore is an important strategic reserve metals in China,mainly distributed in the northwest,southwest,and northeast,of which Jinchang nickel ore in Gansu accounts for 63.9% of China's total reserves.Jinchang Nickel Mine bears the important responsibility of national nickel resource supply,of which Jinchuan Mining Area is an important nickel mining area in Jinchang.With the progress of mining,the ground surface of the West Second Mining District of its Longshou Mine experienced large ground fissures in June 2016,and there is a possibility of collapse at any time.The mining was immediately stopped at that time,and until April 2019,the first stage of sublevel pillar-less caving in this area was adopted.It is of great significance to understand the surface subsidence during the industrialization experiment and study the rules of industrialization experiment and surface subsidence for the safe and efficient use of the bottomless pillar segmented caving method in the Jinchang mining area of Gansu in the future.This article proposes to use the method of space-air-ground data integration to monitor the change of surface subsidence in the experimental area.From the three levels of air,space,and ground,SBAS-InSAR technology,UAV tilt photogrammetry technology,and leveling are used to test the industrialized experimental area.The main research work and results are as follows:(1)By using measured level data and existing GNSS data,it is verified whether SBAS-InSAR technology can effectively monitor the surface subsidence of Jinchuan mining area.This paper uses SAR image data to conduct multiple experiments and select the appropriate interference filtering method and filter.The adjustment of various parameters and other parameters resulted in the best relevant parameters and technical processes applicable to this region.Based on Sentinel-1A 65 scene image data,thes cumulative settlement of the study area from January 2016 to November 2019 and the settlement rate of each year were reported.(2)Based on the omnidirectional analysis of air,space and ground in the experimental area using the pillarless sublevel caving method for mining and excavation,the monitoring results of surface subsidence and the results of existing microseismic data show that the settlement amount and the pillarless sublevel caving method are used for mining.There is a positive correlation between the progress of the process,the more events,the more settlement,but the surface will change significantly after 1-4 days after the event,which also indicates that this industrialization experiment was successful and the bottomless column was developed for the subsequent surface sublevel caving provides a strong basis for safe mining.(3)The data integration based on Cesium-Vue was completed,and the centralized deployment of 3d real scene model and multi-source data was realized,including the conversion of 3d data format and the management of multi-source data.UAV tilt photogrammetry is the main data source,a tilted three-dimensional model was constructed,and a data integration display platform was designed in conjunction with the InSAR settlement results to solve the problem of multi-source data management and display in Jinchuan mine.