| Stability of stopes is one of important factors influencing safety of workers and appliance in dangerous underground mining activities. The stope's stability and safe mining technology in complicated deep ore body of Kangjiawan Mine were studied using ANSYS finite element soft in this paper, based on site survey of geological condition and laboratorial measures about physical and mechanical features of rock and ore. Main researching results are summarized as follows:1. Roof stability of emptied areas in Kangjiawan Mine was geologically and technically evaluated based on results of site survey and laboratorial measures.2. Physical and mechanical features of major rock and ore in Kangjiawan Mine were measured in laboratory.3. Supporting methods of broken zones widely employed in China and abroad, such as safety pillar, bolting, roof-cut, and artificial roof, were analyzed. Application feasibility of above supporting methods in large scale weak rock layers of Kangjiawan Mine was also discussed.4. Various plastic-elastic stress constitutive relations of rock and soil were summarized and construction process and parameter choice approaches of Drucker-Prager model were studied. More important, application procedures of ANSYS soft in non-linear simulation of rock and soil were given. A case indicated that ANSYS was a useful numerical simulation tool for stability analysis of goaf.5. The stress, strain, range of plastic zone and safety degree of surrounding rock were simulated and calculated by 3D finite element soft on condition of different extraction schemes, stope widths, roof-supporting measures and side pressing parameters. The simulation results gave an optimum sizes of stope in complicated deep ore body of Kangjiawan Mine.6. It is well known that extraction of inclined ore body with mediate to thick width and weak roof is very difficult. The mining method for this kind of ore body was also suggested in this paper based on above researching results. |
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