IMPACT OF MAWEISHAN LIMESTONE OPEN PIT MINE ON ENVIRONMENTAL STRESS AND ITS TREATMENT AND RESTORATION
Taking the Maweishan open-pit limestone mine in Xiahe County,Gansu Province as a case study,this paper summarizes the influencing factors of open-pit exposure of limestone mine on the environment through field investigation and analysis of relevant literature.The results show that the stress impact of limestone open-pit mine on the environment focuses on the geological environment and geomorphological landscape.Specifically,it includes:first:unstable slope,uneven,weathered rock mass fragments on the slope body have signs of falling outcropping,poor stability;Second,the soil in the mining area is alpine meadow soil,and the mining activities lead to the loss of the original soil and the deterioration of the soil structure,forming a black soil beach;Third,the open-pit mining activities in the mining area destroy the stratigraphic structure in the area,resulting in changes in fractures,fissures and tectonic joints,and destroying the aquifer structure,but have little impact on the decline of groundwater level.Fourth:the rock mass of the mining face is exposed,and the waste rock(slag)discharged from the mine is accumulated on the hillside or valley,which brings strong visual pollution to the landform landscape.Through the AHP analysis method,the optimization mode of ecological governance and restoration was screened out for the limestone mine relics with complex structure and serious damage,and the optimization mode of mine ecological governance and restoration was screened out.From the weight distribution of restoration measures,it can be seen that leveling,soil covering,grass planting and clearing of dangerous rocks on the slope of the open-pit mine site platform occupy a prominent position.
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