Study on reclamation suitability evaluation of mine subsidence land based on game theory and cloud matter element model

In view of the fuzziness and randomness of the evaluation index factors of mine subsidence land reclamation suitability,a comprehensive weighting- cloud matter element model based on game theory was constructed. Combined with the actual situation of the mine,the model divides 11 secondary evaluation indexes from three aspects including topographical environment,water conservancy environment and soil environment. The subjective and objective weights were determined through genetic algorithm and analytic hierarchy process (GA-AHP) and coefficient of variation method (CV),respectively. The comprehensive weight of the index was calculated by game theory, and the cloud model was introduced into the matter - element model. The model was applied to the Fenghuangshan Silver Mine in Guangxi, the correlation degree of primary index and comprehensive correlation degree were calculated,and the suitability of land reclamation was evaluated. The results show that the reclamation suitability evaluation grades of the subsidence land No. 1 and No. 6 for forest land were “barely suitability”, while the reclamation suitability evaluation grades of the subsidence land No. 2, No. 3, No. 4, No. 5 and No. 7 were “medium suitability”. The evaluation results are consistent with the field investigation,which can provide a new idea for the implementation of mine subsidence land reclamation.