Evaluation And Utilization Mode Of Underground Space Resources In Closed Coal Mines

The underground space of closed coal mines is a geological resource with great potential,and the development of this resource is one of the paths for the transformation and development of resource-depleted mining areas.The development method depends largely on the suitability with the utilization mode,and the suitability is influenced by the grade of underground space resources.In response to the above problems,the evaluation model of underground space resources of closed coal mines and the evaluation model of utilization mode were established by entropy weight method,hierarchical analysis method,fuzzy comprehensive evaluation method and TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)method,and the underground space of closed coal mines in Nanzhuang,Yangquan Mining District,Shanxi Province,was used as an example to evaluate its resources and study its utilization mode.The main understandings obtained in the thesis are as follows:(1)The mathematical modeling theory is preferred for the evaluation model and utilization mode of underground space resources of closed coal mines,including:entropy weight method,hierarchical analysis method,fuzzy comprehensive evaluation method and TOPSIS method.(2)The underground space resource evaluation index system of closed coal mines was constructed based on the three guideline layers of spatial utilization,stability and safety,including 12 index layer indicators such as mine geological structure,surrounding rock compressive strength,surrounding rock permeability and coal seam spontaneous combustion propensity.The classification and quantification bases were proposed for the selected indexes,and qualitative and quantitative classifications were made,and then an evaluation model for underground space resources of closed coal mines was constructed based on entropy weight method,hierarchical analysis method and fuzzy comprehensive evaluation method.(3)The influencing factors of underground space resource utilization of closed coal mines were clarified in four aspects: natural environment,development safety,utilization efficiency and comprehensive benefits.Based on the above-mentioned influencing factors,six indicators for the evaluation of underground space utilization mode of closed coal mines were selected,and the evaluation model for the selection of underground space utilization mode of closed coal mines was constructed by using the entropy weight method and TOPSIS method.The evaluation indexes of different alternatives were quantified and assigned with the methods of consultation analysis,expert scoring and simulation calculation,and the ideal utilization mode was selected by TOPSIS method.(4)Based on the resource evaluation model constructed above,the development space resources of No.15 coal seam of Nanzhuang coal mine were evaluated in grade,and the evaluation result was excellent grade.According to this evaluation result,three different alternative utilization options were proposed for the mine cultural tourism attraction,underground storage,and waste treatment and landfill plant.The criteria values of the indicators were determined for the alternative utilization options and substituted into the utilization mode evaluation model,and the mine cultural tourism site was obtained as the relatively ideal utilization mode.The main advantages of this utilization mode are high land saving and significant economic and social benefits.