Prediction Of Surface Subsidence In Underground Coal Mine And Study On Land Reclamation And Restoration

Coal plays an important role in the energy structure of China,but the large-scale exploitation of coal resources has also caused great damage to the natural ecological environment of coal mining areas.Therefore,the prediction of surface subsidence above the mined-out area has important practical significance for ecological environment protection.This paper systematically summarizes the research status of mine and coal mine control measures at home and abroad.Considering the characteristics of land reclamation in underground coal mines,the paper constructs a prediction model for the surface of coal mines,clarifies land reclamation models,and formulates appropriate land reclamation control measures,including prevention and control measures,engineering measures,phytoremediation,monitoring measures,management and protective measures,etc.Taking the well-field coal mine as the research object,this paper collects the existing environmental-related information of the research area through field survey,and uses the method of combination of remote sensing and geographic information system to obtain the ecological information of the research area.Based on the analysis of the current status of the ecological environment in the research area,types of land use in the research area were divided into bare land,bare bedrock and barren grassland.The animal and plant communities were systematically classified and identified as ordinary communities,with no rare animal or plant communities existed.The research area is semi-arid,the natural ecological environment is relatively fragile,and the anti-interference ability is poor.After scientifically analyzing the influencing factors of coal mining on the surrounding ecological environment,this paper introduced the probability integration method to predict the subsidence area.According to the surface subsidence prediction results,the cumulative maximum value of surface subsidence was 18.63 m,tilted to 184.49mm/m,curvature was 2.78×10-3m,horizontal movement was 5.59 m,and the horizontal deformation was 84.13mm/m.The total field has an impact radius of 127 m and the surface subsidence area is 42.3km2.After the mine is closed,the ecological environment will be greatly damaged,and reasonable prevention and control measures must be taken.Based on the analysis of the current situation of the land,this article basically determined the degree of impact of coal mining on land resources and the ecological environment.According to different damage situations,natural ecological environment protection and management schemes had been formulated,and a method for filling subsidence cracks was proposed.This paper proposed specific treatment methods for forest land,cultivated land and grassland in the subsidence area,developed a monitoring system setting scheme during the long-term treatment of subsidence area,proposed rationalization of ecological environment protection for the current production coal mine.The prediction method and ecological environment protection measures of the subsidence area in this article can be used for reference for the ecological environment management of the subsidence areas of similar coal mines in Shanxi,Shaanxi,Nei Mongol,Xinjiang,large coal-producing province in northwestern China.