Mining Method Optimization Of Hutiaoya Antimony Ore 13~# Ore Body

Mineral resources are the human life, economic construction and social development of material basis. As human demand for minerals continues to increase, becoming less and less of mineral resources, coupled with the irrational development and utilization of mineral resources, causing serious waste of resources, all will eventually lead to resources, environment, economic and social crisis. How efficiently, rationally, economically and safely to develope and utilize mineral resources, reduce loss of resources, reduce ore dilution, is the core of mining scientific research.In the mine production, the underground mining method selection is a critical core issue. Mining method selection not only impacts the preparation, extraction itself, but also directly relates to various mining aspects of other production processes; ultimately, it may affect the safety and economic benefits of deposit mining, therefore, we must give high priority in the design. Traditional Mining method selection use technical and economic evaluation method commonly, but it only assess the merits of mining method by a single indicator in analysis and comparison of the technical and economic. The method is difficult to get a combined effect of mining method and to get a quantitative indicator. Moreover, in many of the mining method selection factors, there are still many qualitative indicators; the traditional mining method selection is not to quantify these indicators to form a unity indicator with other quantitative indicator together. In order to overcome the limitations of traditional mining methods selection, achieving a comprehensive and accurate results, on the basis of in-depth study of the traditional mining method selection, combining fuzzy theory, creatively put forward the " Mining method selection based on Variable weight method Fuzzy comprehensive evaluation ", it provides a new method for mining industry. The new method not only solves the problem of quantitative assessment for mining methods, and variable weight method can adjust the weights according to the size of the assessed value of each factor. When a target is relatively low, the method can increase its weight appropriately to reduce the comprehensive evaluation value, thus emphasizing the imperfection of the factor; finally the comprehensive evaluation result is more rational, scientific. This paper uses fuzzy comprehensive evaluation based on variable weight method to select scienceficly the mining method of hutiaoya antimony ore gently inclined medium thick ore body, and ultimately come to the cutting top room and pillar method is the best. Mining method selection part of this thesis, the main contents are as follows:(1) Site investigation and the collection of geological data, combined with ore mining conditions, and refer to similar experience, then to select the preliminary alternative mining methods.(2) According to the selection principle of evaluation factors, to detail analysize actual situation in mine, to determine the evaluation factors set. Pairwise comparison of evaluation factors is proceeding by using effective AHP, and then to calculate basic weight.(3) An evaluation vector can be obtained by the use of certain mathematical method; the variable weight value can be get from evaluation vector and variable weight value.(4) To select the appropriate function of the comprehensive evaluation, fuzzy comprehensive evaluation value can be calculated from the evaluation vector and variable weights value. By the size of integrated value the merits of alternative mining methods; the best mining method is selected.For the stope mining, from the production perspective, the smaller pillar and larger stope size can improve production efficiency and the recovery rate of ore; but from the safety perspective, the larger pillar and smaller Room size only ensure Stope stability. Therefore, Effective mining of ore and the stope stability have become a contradiction; the determination of stope structural parameters indeed is a complex issue. Mine production in China, in determining the structural parameters of the stope, the experience analogy is applied widely. However, experience analogy is powerless in facing some complex ore body or not having much experience. In this thesis, in determining the stope structure parameters, the numerical simulation software FLAC3D is used, for different stope structural parameters, stope stability is a qualitative or quasi-quantitative analysis; finally get a more rational structure of the optimal parameters of the stope. Major contents of stope structure optimization study are as follows:(1) According to the specific characteristics of geotechnical engineering, to select the appropriate constitutive model. Mohr Coulomb model is applicable to ordinary soil and rock mechanical behavior, therefore I choose it.(2) we should use scientific and reasonable method to determine the parameters of rock mechanics. Accurate rock mechanical parameters are essential to correctly simulate, the rock mass mechanical parameters should be selected very carefully.(3) For selected mining method, combined with the practicce and applied experience analogy in the project to propose several groups programs, the programs is reasonable generally, multiple options are formed.(4) According to the characteristics of each option, different geometric models were establishe, and to set reasonable initial boundary conditions.(5) Strict convergence analysis is necessary for the various options. This paper analyzes the programs stress, strain, displacement and plastic zone, combined with the mechanical damage characteristics of rock mass, by analysis and comparison of the stope stability; it comes to the stope stability evaluation.(6) In the premise of ensuring stope stability requirements, combined with high recovery rate and labor productivity, etc., to determine the optimal structural parameters of the stope.