Remote Sensing Monitoring And Evaluation Of Mine Geological Environment In Ji'nan Open Pit Mining Area

Opencast mining mineral resources make great contributions to economic construction,social progress and human development.But at the same time,opencast mining area also caused damage to the surrounding geological environment of mining area to some degree,resulting in a serious of ecological environmental problems.On mastering the status and development trend of mine geological environment,monitoring the mountain excavation effectively,especially to strengthen the monitoring and management of mining areas,to evaluate the quality of mining geological environment and quarry centralized classification statistical analysis.It can provide the scientific basis for relevant departments to take measures to restore geological environment of the mine and to develop and utilize mineral resources reasonably.This paper takes the concentrated opencast mining area in Ji'nan City(Pingyin County,Changqing District,central city,part of zhe township in Licheng District and Zhangqiu city)as the study area,and takes the Digital Orthophoto Image of the study area as the data source(2008,resolution 0.5m;2015,resolution 0.1M).Combining with the relevant data of mining area in the study area,mine geological environment of the concentrated opencast mining area in the study area were interpreted indoors,and tested and verified interpretation to improve interpretation accuracy of indoor and the interpretation of signs.I analyzed the mine geological environment situation and changes,characteristics of landscape pattern in 2008 and 2015.Finally,the square grid is used as the evaluation unit,and the evaluation index is selected scientifically and reasonably,the evaluation index system is constructed,the index grade is divided,and the weight of evaluation index is determined by the analytic hierarchy process(AHP),with the synthetic assessing model based on the ArcGIS platform to obtained geological environment quality four partitions such as fine,good,generally,poor,and statisticed and analyzed each partition.The conclusions are as follows:(1)The analysis shows that the solution of mine geological environment in 2008 and 2015 in the study area,the scale of the open pit quarry in the study area continued to expand,mine construction increased,industrial activity increased during the period of 2008~2015;at the same time mine restoration has been paid more and more attention,the number of mines reclamation increased,but the mine geological environment quality continues deterioration.(2)According to the specific circumstances of the study area,the evaluation index system and grading were established to ensure the evaluation index of comprehensive,scientific and objectivity.The index weights of AHP-a method of combination of qualitative and quantitative was used to count the evaluation index weight,avoiding the subjectivity to some degree.Finally,based on the ArcGIS10.2 platform,the comprehensive evaluation model was used to evaluate the mine geological environment quality,and the evaluation result accords with the actual situation of the study area.(3)By interpolation of the evaluation results of 2008~2015 years,the quality of the mine geological environment in the "fine" and "good" area decreased from 2213.13km~2 to 1944.20km~2,occupied the proportion of the study area decreased from 65.47% to 57.52%.The area of mine geological environment quality in the "poor" area increased from 400.54km~2 to 655.97km~2.In 2015,the area of the "poor" area reached 19.40%,an increase of 7.55% compared to 2008.So the reduction of the "fine" and "good" area of the mine geological environment quality and the increase of "poor" area indicates that the exploitation of the mine in study area has increased,and the quality of the geological environment has deteriorated.