Ecological security assessment of land reclamation for mine areas after mine closure

Fuzzy mathematics and Analytical Hierarchy Process(AHP) are applied to assess the safety of ecological environment for mine area after closure. Soil, hydrology, geology, wind, waste piles, mined-out areas, and other factors which influence safety of mining area are considered as the first-laying influence factors, then mathematics model is established. According to the weights of the influence factors and the subjection degrees of danger's grades, the fuzzy matrix is established. Then the ecological safety degrees of the mine areas can be calculated. Taking some mine area closed as an example. The ecological security of land reclamation is appraised. Result shows that the ecological security degree of mine land reclamation is high. The method can provide some practical directions for ecological environment of mine areas after mine closure.