| Due to the increase of mining scope and mining depth,the phenomenon of in-situ stress in the Chaihulanzi Gold Mine in Chutoulang Town,Chifeng,Inner Mongolia has begun to appear,and there are potential safety hazards in the stope.The original mining design for shallow deposits cannot continue to serve deep mining.field.The Chai Mine is preparing for the rational exploitation of the newly discovered resources in the deep.It is necessary to adjust and control the underground pressure in the deep stope of the Chaihulanzi Gold Mine,so as to reduce or transfer the stress in the stress concentration area caused by mining,and reduce the stress release.The surrounding rock is deformed and damaged,so that the production plan of the deep deposit of the Chaihulanzi gold mine can be implemented in a safe,efficient and orderly manner.Therefore,it is necessary to carry out the research on the key technologies of underground pressure regulation in deep mining.Through the exploration and testing of the ore body of The Chaihulanzi Gold Mine and the distribution of in-situ stress in the deep deposit,it is necessary to explore the evolution law of the ore house and mine in the deep stope under the high in-situ stress evolution law.Based on the instability and failure mechanism of the column,put forward the overall underground pressure control measures for deep deposit mining,optimize the stope structure parameters and the overall mining sequence,and plan the next production of The Chaihulanzi Gold Mine,so as to improve production efficiency,reduce production costs,and safely recover ore resources.the goal of.The main research contents of this paper are as follows:(1)Based on the background of deep mining in the Wenjiadi West mining area of The Chaihulanzi Gold Mine,the geological conditions and mining technical conditions of the mining area were surveyed and collected,and the rock mechanics macroscopic investigation and analysis of the surrounding rocks of the main ore bodies in the middle +500m ～ +220m section of the Chaihulanzi Gold Mine were carried out.Analysis and understanding of the underground pressure manifestation activities that have occurred in the deep roadway and stope,and use the geological drilling core to determine the distribution of the real in-situ stress field of the deep newly explored ore body and its surrounding rock.It provides a realistic basis for further research on structural parameters of deep stope and optimization of mining sequence.(2)Using the stability analysis theories such as elastic mechanics and structural mechanics,the mechanical model of the deep stope pillar and roof was established,the deformation characteristics and failure mechanism under high underground stress were studied,and the overall underground pressure control measures for deep mining in the mine were proposed.In the future,the phenomenon of underground pressure can be alleviated by optimizing the structural parameters of the stope and the mining sequence of the ore blocks.(3)Considering the actual mining situation of Chaihulanzi Mine,the three-factor and three-level orthogonal test method was designed for the structural parameters of the deep stope,and the three-dimensional geological model of the deep deposit of Chaihulanzi Gold Mine was constructed with the help of 3DMINE mining engineering software,coupled with three-dimensional The finite difference numerical calculation software FLAC3 D is used to numerically simulate the whole process of mining in the mine,obtain various index values such as pillar stress,displacement and plastic zone,and analyze the influence of stope structure parameters on the law of underground pressure migration.(4)Combined with the evaluation index values of various influencing factors,Fuzzy Mathematics Theory and Analytic Hierarchy Process(AHP)are used to establish target relative priority matrix and weight matrix,and comprehensively judge and select the best plan for stope structure parameters.(5)A numerical calculation model for the mining sequence of deep deposits was established,and the overall mining sequence of the deep veins of the Chifeng Chaihulanzi Gold Mine and the mining sequence of the ore blocks in the middle section were numerically simulated and optimized,and the evolution law of stress and displacement under different mining sequences was studied.Determine the best recovery sequence suitable for deep well mining of diesel mines to achieve the purpose of underground pressure regulation.91 Figures,19 Tables,99 References... |
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