| After hundreds of years of mining of Xi mines, especially with the limitation of early mining technology, a large amount of remaining antimony ore, can not be timely recovered, is remained. And a large number of mined-out areas are formed, which leads to the deterioration of the environment of remaining ore recovery, deformation of ore pillar, many natural disasters like large area roof fall, surface subsidence in large area and water inrush, and even causing significant casualties and serious economic losses. With the rapid economic development of society, the consumption of mineral resources is accelerating, leading to depletion of easily mined resources of high quality. In order to maintain stable production of mining enterprises, reserve should be increased by improving the intensity of deep and peripheral prospecting; further more efforts of remaining ore recovery should be paid. Therefore, this paper has systematic and in-depth research based on how to mine the remaining ore, in Hunan Shanxing antimony industry limited Responsibility Company, with safety, economy and efficiency. The main content is as follows:(1)Through the analysis of mining technology conditions in Xi mines and a wide range of field exploration in many mined-out areas and the stability of mined-out areas, risk classification on stability of mined-out areas has be made with the analysis principle of fuzzy mathematics theory.(2) Due to the limitations of fuzzy evaluation theory itself, analysis results may not be very reliable, and therefore in order to support the correctness of the analysis, numerical simulation method, for objective analysis, is used and analysis results present that roof tensile stress values in some section of2#and4#area exceed the ultimate tensile strength, the condition of which is critical, and the rest mined-out areas are relatively safe.(3)In order to stope the remaining ore resource in Xi mine with safety, high efficience and being scientifical and the recovery programme design of remaining ore, based on the technology of remnant ore classification and technical conditions, using basic theory of fuzzy mathematics (Fuzzy) and analytic hierarchy process (AHP), four kinds of optimization of mining model of alternative are evaluated comprehensively on the basis of index system of comprehensive evaluation. The impact of the factors of mining scheme should be considered from three aspects economy, technology, and safety, which should be converted into attached matrix. Thruough AHP, it determines objectively the weight vector of factors and constructs a fuzzy comprehensive evaluation model. Programmes, based on the comprehensive superior of influence factors, are produced with the fuzzy mathematics theory, which presents the superior of alternative mining model to determine optimal mining model.(4) In order to select proper structure parameters of the stope, on the basis of mechanical parameters of rock and backfilling, using finite element analysis software of MIDAS, structure parameters of remaining ore mining stope can be optimized. Based on mining limit exposure area, simulation, using MIDAS, of different structural parameters of stope, stresses and deformations of mining stope of different mode, simulation results of analysis, it ultimately determines the optimal plan.(5) optimizations of architectural design and the optimum mining programme are included developing mining-cutting project and layout of roadway, mining equipment selection and matching, stope backfilling technology (including top backfilling technology, water treatment technologies), analysis of the economic benefits of mining methods and security recovery measures. |
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