Evaluation Of Mine Environmental Damage In Qinling Mountainous Area Of Southern Shaanxi

Based on the field investigation and sampling,the main environmental problems of the mining area were identified and analyzed according to the damage of mine environment in Qinling mountainous area of southern Shaanxi.Through the analysis of laboratory data and the relevant data collection and analysis,the water and soil pollution are more prominent,and the factors such as various geological disasters,soil erosion,vegetation destruction and land occupation are selected as the evtaluation indexes.The hierarchical model is constructed on the selected indicators,and the weights are calculated by using the analytic hierarchy process(AHP),and the indicators are quantitatively indexed according to the pre-determined criteria.The fuzzy comprehensive evaluation model and matter-element extension model are established respectively.The environmental damage of Qinling mountain area is divided into three grades:mild damage,moderate damage and severe damage.The membership degree of each index is calculated,and the weight coefficient and membership degree Of the fuzzy operation to determine the evaluation level,the results of the two methods of comparative analysis,the final conclusion.The main conclusions are as follows:(1)The key environmental damage problems in the mining area are environmental Pollution,ecological damage and geological disasters.Environmental pollution is mainly mine water and soil heavy metal pollution is more serious;ecological aspects,mining destrucion of vegetation and aquifers,exacerbated soil erosion;disaster area is collapsed and landslide as the representative;(2)In the assessment of environmental damage in the mining area,the contribution of vegcoation damage to the environmental damage in the mining area of southern Shaanxi was the highest,reaching 0.24,followed by debris flow,soil erosion,water damage,ground subsidence,heavy metal pollution,land occupation and destruction,landslide and Soil heavy metal pollution,collapse(0.02)has the least impact on environmental damage;(3)The fuzzy comprehensive evaluation method is consistent with the evaluation result of the matter-element extension evaluation method,which is the intermediate damage and confirms each other's conclusion.