Assessment Of Mining Geo-Environmental Carrying Capacity

With the development and utilization of mineral resources,the problem of mine geological environment is becoming more and more serious.It is an important and urgent problem to realize the exploitation and utilization of mineral resources while ensuring the "health" of coordinated geological environment.How to determine the critical threshold of geological environment in the process of mineral resources development is an important issue to explore the protection of mine geological environment.Therefore,the bearing capacity of mine geological environment is becoming increasingly prominent.It is an urgent task to explore and study the bearing capacity of mine geological environment.Based on the field survey data and collected data of Baorixile mining area in central Hulunbeir grassland,starting from the definition of mine geological environment and combining with the geological environment background of the study area,this paper chooses five pairs of influence of mine development on mine geological environment: topography,shallow soil environmental quality,vegetation,groundwater system and surface water body.Based on the analysis of the images,it is concluded that the impact rates of mining development on topography and landform,shallow soil environmental quality,vegetation,groundwater system and surface water are 4.58%,0,12.29%,48.92% and 0,respectively.According to the relationship between the carrying capacity of mine geological environment and the change of geological environment caused by mining development,that is,the greater the change of geological environment,the smaller the carrying capacity of mine geological environment,and the greater the change of geological environment,the smaller the reduction of carrying capacity.Then the relationship between them can be described by a decreasing function of change rate.Define the change index(range of value is 0-10)as the normalized index of the geological environmental impact rate of mining development,then the corresponding bearing capacity index can be I(bearing capacity index)= 100-Bd2(change index).In this way,a mathematical model for calculating the bearing capacity index of mine geological environment is established.According to the variation index of the study area,the bearing capacity index is calculated and I = 87.398 under the comprehensive index method and 65.308 under the Nemerow index method.It is concluded that it is appropriate to use the comprehensive index method in Baorixile mining area.According to the range of carrying capacity index and the evaluation and classification of mine geological environmental carrying capacity,it is concluded that the mine geological environmental carrying capacity of Baorixile mining area belongs to the "good" level.This paper provides an interpretation of the concept of "mine geological environmental carrying capacity" and a research method for the evaluation of mine geological environmental carrying capacity,which provides a reference for the study of mine geological environmental carrying capacity and for the development and utilization of mineral resources in Baorixile mining area.