Longtime existence of the mined-out region brings enormous security potential risk to the residents living in ore area. The model of the mined-out region underground has been established and calculated, and the effect of mined-out region on ground subsidence has been analyzed. The analysis result shows that the deformation of the roof of the mined-out region has significant influence on the ground surface and measures must be carried out immediately. Finally, the rational measures for treating the mined-out region are given to ensure the smooth and safe operation of the follow-up mining.
Workers in underground uranium mines work chronically in the opening radiation environment, the radiation hazards they suffered has attracted public’s attention. So some effective measures must be carried out to control worker’s received radiation dose. Fault tree analysis is a deductive system safety analysis method, which can offer decision basis for accident prevention and safety management. Based on the above two advantages, firstly, the paper analyzes the radiation hazards in underground uranium mines and their influencing factors. Then, the fault tree of radiation hazards is established in underground uranium mines, five groups of minimal path sets and the structure importance degree of each basic event are obtained. Finally, according to the results of fault tree analysis, some prevention countermeasures are putted forward to prevent radiation hazards.
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