Research Of Extraction Quality Evaluation Of A Stope And Safety And High-efficiency Extraction Of Ore Pillar Based On A Cavity Monitoring System

A large amount of cavities formed by the metal mineral resources underground mining is not only endangering mine's life security, but also making the resource reclaims of sufficiency very difficult. Therefore, taking advanced cavity monitoring system as methods, carrying out the research and application of relevant technology based on the cavity monitoring system have already become a significant forward research topic confronted by our country metal mine safety in production.The paper synthetically applys many methods such as theoretical analysis, scene monitoring, comprehensive evaluation, program design, numerical simulation and so on, with the cavity monitoring system(CMS), adopting mining software such Surpac and finite element analysis software RFPA as the main methods. Combining the research projects "The study and application of the cavity monitoring technology", in allusion to Dongguashan Copper Mine specific project practice, and taking the cavity 3D model structure technology of CMS as basis, a lot of technology research include the safety analysis of cavity, the foundation of the stope mining quality evaluation index system and mining quality evaluation, mining safely and efficiently pillar in the complicated stope border and the numerical simulation of pillar mining process are carried out.With cavity monitoring system (CMS), plan and regular monitoring to cavity would be carried out in Dongguashan copper mine. Using Surpac software established visualization three-dimensional goaf model, accurate access to the mined-out area of three-dimensional space form, and the actual border and other related information as a basis for carrying out the relevant security goaf analysis, including the roof goaf roadway safety analysis, the security situation in the border pillar goaf deformation analysis and dynamic monitoring of the safety analysis. Master its deformation and analyze intuitively safety of cavity.Taking CMS as the methods of scene monitoring and cavity 3D data acquisition, we have carried out scene monitoring to 52th, 54th, 56th line, and total of 14 cavities of Dongguashan mining since the end of 2006, we could edit and process 3D data through the 3D modeling software Supac, and acquire some mining technology index including the amount of stope over-break and under- break, retention core, dilution and loss rate,and so on by design calculating, then taking this as basis, we founded the stope mining quality evaluation index, and made a weighted analysis of each index through hierachical analysis and fuzzy comprehensive evaluation method, achieved final evaluation results, and provided a reference to optimize mining program and reduce production cost.Combining with Donggua Shan Copper Mine practice, taking 52-9~# pillar between 52-8~#and 52-10~# as an example, we establish pillar solid model based on the actually acquired cavity model, and get pillar actual boundary section by solid cutting, propose two sets of pillar mining blasting design program, and make a comparative analysis, at the same time make comments on it.Use RFPA to simulate pillar mining process, through analysing the situation of the border rocks stress. To Validate the blue map of the pillar mining.