铀尾矿堆黏土覆盖治理数值模拟研究

根据铀尾矿堆中放射性核素氡迁移特性,建立覆盖情况下铀尾矿堆氡迁移模型,创新性地使用COMSOL multiphysics软件对覆盖层中氡浓度分布进行可视化数值模拟,采用正交试验对结果进行了分析,并采用RAD7测氡仪分两组实地测量某铀尾矿堆黏土覆盖后的氡浓度。结果表明,采用黏土覆盖时,覆盖层厚度1 m,孔隙率0. 30比较经济合理,黏土参数最佳水平组合为:扩散系数0. 8×10^-6m^2/s,孔隙率0. 30,覆盖材料密度1 850 kg/m^3,渗透率20×10^-12m^2,吸附系数0. 82 L/kg。研究使用COMSOL multiphysics软件进行可视化数值模拟,开拓了尾矿堆治理的研究思路,具有重要的理论和实际意义。

Simulation Study of Clay Layer Coverage Governance of Uranium Tailings Pile

According to the radonuclide migration characteristics of uranium tailing pile,a radon migration model of uranium tailing pile under the coverage condition was established.The radiative radon concentration distribution in the overburden was visualized by COMSOL multiphysics software,the results were analyzed by orthogonal experimental design and RAD7 radonometer was applied to measure the radon concentration of a certain uranium tailing clay in two groups on the spot.The results show that the thickness of the coverage layer is 1m and the porosity is 0.30 when covering with clay.The optimum combination of clay parameters is as follows:the diffusion coefficient is 0.8×10^-6 m^2/s,the porosity is 0.30,the covering material density is 1 850 kg/m^3,the permeability is 20×10^-12 m^2,and the adsorption coefficient is 0.82 L/kg.The COMSOL multiphysics software is used to carry out visual numerical simulation,Which has opened up the research ideas of tailing pile harnessing and has important theoretical value and practical significance for tailing pile harnessing.