Research On Dynamic Evolution And Quality Evaluation Of Mine Eco-geological Environment

The continuous development of the mine causes increasingly serious damage to the ecological and geological environment of the mine.Extraction of ecological and geological environment evaluation indicators is carried out using multi-source remote sensing image data,to analyze the spatial and temporal evolution characteristics of each indicator.It carries out mine ecological and geological environment evaluation by using principal component analysis to grasp the distribution of ecological and geological environment quality in mining areas timely,grasps its dynamic development law by analyzing its evolution law,providing both information assistance and decision-making services for the protection,restoration,treatment and sustainable development of the mining environment.A mining area in Shenmu County,Yulin City,Shaanxi Province is used as the study area,with Landsat remote sensing images of three periods in 2009,2012 and 2016 as the data source,to extract four evaluation factor components of greenness,dryness,humidity and heat,and determine the weights of each evaluation factor using principal component analysis for the construction of remote sensing ecological environment index evaluation RSEI and dynamic analysis.It selects Landsat images,In SAR data images and geoenvironmental data for three years,2017,2018 and 2019,as data sources.For the actual situation of the study area,evaluation factors such as subsidence,groundwater,lithology and mine construction are supplemented at the physical geography,geological hazard and mine construction levels on the basis of the original RSEI ecological environment evaluation factors,which constitute a total of 8 indicators for geological environment evaluation.Determination of the weights of each index is done via gridprincipal component analysis to establish a mine geological environment evaluation model and analyze the dynamic changes of the geological environment.Conclusions are obtained as follows.1)Variations of each ecological evaluation factor in the study area from 2009 to2016 are obvious: significant improvement in greenness,more stable humidity,increase in dryness,and a significant decrease in heat.Overall,these ecological environment quality has improved significantly,but the overall evaluation grade is still poor.2)Also,variations in each geo-environmental evaluation factor in the study area during 2017 to 2019 are relatively significant: stability in both greenness and humidity conditions;an increase in dryness;a slight decrease in temperature;an expansion in the extent and deepening of subsidence;lithology represented mainly by the strength of the water-richness of the land;and a relatively stable height of the groundwater table.In general,the ecological and geological environment has deteriorated,which is concentrated in the vicinity of the mine plant and the underground mine extraction area.Mining and anthropogenic surface activities are the primary influencing factors of geological environmental damage in mines.25 figures;17 tables;60 references...