Study On Optimization Of Stope Structure Parameters Of Yunxitangziwa Thin Orebody

The mining method is very important for mining enterprises.If the mining method is unreasonable,it will lead to the loss of the economic benefits of the mine,and in the worst case it will affect the mine safety and cause geological disasters.With a reasonable mining method,it is necessary to further determine the scientific stope structure parameters in order to maximize the mining efficiency.Reasonable stope structure parameters can ensure the safety and stability of the stope work,and at the same time,it can further improve production efficiency and bring good benefits to the mine.In this paper,the geological deposit geology and occurrence conditions of the Tangziwa 34 ore group in the Yunxi Fengliu Mountain are taken as the research object.Optimized research on the shallow hole method used for the thin ore body,Combined with actual conditions such as mining technology and ore body storage conditions,according to theoretical analysis,reasonable values of various structural parameters in the stope were obtained.And construct the game theory-improved TOPSIS comprehensive evaluation model to optimize the stope structure parameter scheme,and finally select the optimal stope structure parameter for the mining method through the method of numerical simulation.The main research contents are as follows:(1)In addition,the thin plate theory is introduced to establish the four-sided fixed-supported and four-sided simply supported roof models to study the relationship between the thickness and length and width of the roof of the mine.The reasonable value range of the three stope elements is obtained through theory.(2)Using the stability factor of the pillar as the evaluation index,the orthogonal design experiment of 5 levels and 6 factors was carried out.Through the experiment,the 6 factors were ranked in the influence,It is obtained that the ore pillar width(1.34)has the greatest influence,followed by the buried depth(0.81)and the mine span(0.62);further support theory is introduced to calculate the reasonable size of the ore pillar.(3)Preliminary selection of the structure parameter scheme of the stope was carried out,and a game theory-improved TOPSIS comprehensive evaluation model was established.Eight evaluation indicators were selected from the three aspects of technology,economy,and safety to analyze and evaluate the three groups of optimization schemes.The vertical distance between the scheme and the positive ideal solution further shows that the paste progress of scheme 3 is the smallest,which is 0.056.(4)The three groups of primary stope structure parameter schemes were modeled by MIDAS modeling software,and FLAC3 D was introduced for simulation analysis,and then thesimulation was divided into six steps to analyze the stress,displacement and plastic zone respectively.Through each group The stress,displacement and plastic zone of the plan are analyzed and evaluated on the stability of the three sets of plans,and the evaluation results of the game theory-improved TOPSIS are mutually verified.Finally,the third scheme is the optimal stope structure parameter scheme.