基于氡析出机制的铀矿井巷道通风可靠性分析

Reliability analysis of tunnel ventilation based on the mechanism of radon exhalation in uranium mine

为解决铀矿放射性开采安全作业问题,氡的防护尤为重要,而氡运移规律及通风可靠性是解决防氡问题的基础,因此,研究铀矿氡迁移及通风可靠性具有重要的现实指导意义。本文以铀矿井巷道为研究对象,应用系统可靠性技术及氡析出机制,探讨氡在多孔介质中的渗流-扩散迁移规律,分析巷道内稳态和非稳态下氡的析出与分布,建立氡浓度安全作业条件下的铀矿井巷道通风可靠性模型,并利用MATLAB PDE工具箱开展了巷道氡迁移模拟及巷道通风可靠性数值分析,这为地下空间氡防护和铀矿井通风安全作业提供了参考依据。

Background： Radon protection is particularly important in underground uranium mining, and the migration regularity of radon and radon ventilation reliability are the base to solve the problem. Therefore, it is of practical significance to study the reliability of ventilation of uranium and radon migration. Purpose： The aim is to explore the radon diffusion regularity of seepage in porous media with system reliability and mechanism of radon exhalation. Methods： The exhalation and distribution of radon in the tunnel under the steady state and unsteady state were analyzed and the numerical simulation of the tunnel for radon migration was developed using MATLAB PDE toolbox. Results： Radon concentration within the tunnel increased with the length of flowing under both unstable and stable conditions with a period of time of ventilation. Calculation of reliability of tunnel based on the mechanism of radon exhalation reflected the exhalation and distribution of radon concentration of tunnel well. Conclusion： The results show that the understanding of the law on the radon exhalation provides reference for radon-prevention in underground space and ventilation and safe operation of uranium mine.