Evaluation of micro-topography ecological restoration technology for open-pit mines based on analytic hierarchy process-fuzzy comprehensive evaluation

Through the research of micro-topography restoration and treatment technology for the ecological environment of open-pit mine, more practical, efficient and low-cost new technologies and methods for ecological restoration are explored to provide technical support for the ecological restoration of open-pit mine. This paper conducts a comprehensive evaluation of mine ecological restoration technology evaluation by combining the production process of ecological restoration technology, the actual greening effect and the analytic hierarchy process-fuzzy comprehensive evaluation method. Firstly, through the implementation of engineering measures such as the ecological restoration technology of hanging trough ecological restoration construction, prefabricated ecological restoration construction and planting bag ecological restoration construction, combined with planting for ecological restoration, the topography and landform of abandoned mines are improved and the greening area is significantly increased. Secondly, through the AHP index system for micro-topography ecological restoration technology is constructed. It selects technical index B₁, vegetation index B₂ and benefit index B₃ as first-level evaluation indexes, twelve indexes such as stability C₁, cost C₂, construction difficulty C₃, etc., are taken as second-level evaluation indexes. Through weighted comparison, it is found that technical index B1 from the first-level index is the dominant index and the stability C₁, cost C₂, greening area C₆ and ecological environment C₁₁ from the second-level index has relatively higher comprehensive weight index proportions. At last, through the fuzzy comprehensive evaluation method, it finds that the scores of the three ecological restoration technologies such as planting bag construction, hanging trough construction and prefabricated construction are all above 80 points and all fell in the good grade. They are all suitable for open-pit mine micro-topography treatment. In practice, it should be selected considering the conditions of mine topography, slope conditions, budget funds, etc. The profound integration of the implementation effect of micro-topography ecological restoration technology and the AHP-FCE method, indicates this analysis method can carry out a comprehensive assessment for the evaluation of mine ecological restoration technologies.