某铀矿山井底车场氡浓度的影响因素敏感性分析

地下开采铀矿山井底车场的风质受多种因素影响,包括入风氡浓度、巷道岩壁氡析出和车场重列车所载松散铀矿石氡的析出.本文选取某地下开采铀矿山为研究对象,基于放射性衰变、连续性方程及紊流传质理论,建立了井底车场氡浓度分布的数学模型.此外,选取了入风氡浓度、待提重车数量及矿车所载铀矿堆氡析出率为变量因素,分析了其对井底车场最大氡浓度影响的敏感度.同时,为探究影响该铀矿井底车场氡浓度的最显著影响因素,结合5次现场调研情况,比较了各影响因素敏感程度.结果表明:在现有工况条件下,入风氡浓度敏感度待提重车数目敏感度=铀矿堆氡析出率敏感度.

Sensitivity Analysis of Influencing Factors for Shaft Station RadonConcentrations in an Underground Uranium Mine

The quality of inlet air in shaft station is influenced by many factors,mainly including radon concentration of inlet air,radon emanation of palisades and uranium mine ore piles loaded in mine-cars.In this paper,an underground uranium mine in eastern China was selected as the research object;mathematical model for shaft station radon concentrations was then set up on the basis of the theories of decay in radioactivity and mass transfer in turbulent flow as well as continuity equation.Moreover,radon concentration of inlet air,number of awaiting mine-cars and radon exhalation rate of uranium ore piles loaded in the mine-cars were considered as variable factors,which were further used in sensitivity analysis with respect to the maximum shaft station radon concentration.Meanwhile,to explore which of those factors makes the most significant effect on shaft station radon concentration,five times of field survey were carried out and the sensitivities of each factor were analyzed.The results show that,with the existing conditions,the sensitivities of each influencing factor exhibit as radon concentration of inlet air is higher than the number of awaiting mine-cars while the latter is equal to the radon exhalation rate of uranium ore piles.