铀矿体上方均匀覆盖层中氡迁移的数值模拟  

Numerical Simulation for Radon Migration in the Homogeneous Overburden Layer Above Uranium Ore Body

作　　者：杨龙泉[1] 李必红[1] 赵丹[1] 吴儒杰[1] YANG Longquan;LI Bihong;ZHAO Dan;WU Rujie(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《铀矿地质》2020年第5期441-452,共12页Uranium Geology

基　　金：中核集团龙灿工程(二期)科研项目“二连基地砂岩型铀矿物化探三维探测技术研究”(编号:物LCEQ02);国家重点研发计划(2017YFC0602600)联合资助。

摘　　要：依据氡的扩散-对流机理,本研究确定了稳定状态下铀矿体上方均匀覆盖层中氡迁移的二维运移方程。采用有限差分方法分别模拟出均匀铀矿体、不均匀铀矿体、两个均匀铀矿体上方均匀覆盖层中的氡浓度分布。文章探讨了数值模拟中扩散系数、对流速度、覆盖层厚度、矿体宽度等模拟参数对氡浓度分布的影响。将迁移模型应用于大庆沟铀矿床,并与室内模型实验所测得的不同深度处的氡浓度值进行对比。实测结果表明,当迁移模型的参数选取适当时,数值模拟结果与实测结果基本吻合。Based on the convection-diffusion theory of radon,a two-dimensional transport equation was established for radon migration in the homogeneous overburden layer above the uranium ore with steady state.The distribution of radon concentration in the homogeneous and inhomogeneous overburden layer above the single and double uranium ore body was calculated respectively by using the method of finite difference.The effects of various parameters in the numerical simulation on the distribution of radon concentration were also discussed in this paper.The migration model was applied to the known uranium ore body in Daqinggou,and compared with the radon concentration values at different depths measured by indoor model experiments.The results showed that when the parameters of the migration model are selected properly,the results of numerical simulation and the measured results can be basically consistent.

关 键 词：氡迁移 数值模拟 铀矿体 

分 类 号：P631.61[天文地球—地质矿产勘探]