铀在花岗岩介质中的迁移预测  

Prediction of uranium migration in granite media

作　　者：韦红钢[1,2] 周仲魁[1] 孙占学[1] 钟佐燊[2] 

机构地区：[1]东华理工大学土木与环境工程学院,江西抚州344000 [2]中国地质大学水资源与环境学院,北京l00086

出　　处：《铀矿冶》2011年第2期89-94,共6页Uranium Mining and Metallurgy

基　　金：国防科工委铀矿高放废物地质处置研究开发项目(科工计[2007]832号)

摘　　要：通过建立高放废物处置预选场研究区水文地质迁移模型,分析pH、弥散度、扩散系数和温度等各种不同的影响因素在模拟中所起的作用。讨论研究了花岗岩地下水中铀扩散吸附时的弥散度、扩散系数、渗流速度、地下水化学成分等参数,并用批式法测定了铀在研究区花岗岩粉末中的分配系数。同时运用美国地质调查局的水文地球化学模拟软件PHREEQC-Ⅱ模拟和预测铀元素进入花岗岩地下水后的浓度分布和迁移情况。结果表明,铀在研究区地下水中迁移主要受pH值、弥散度、扩散系数的影响。Choosing a preselected high level radioactive waste disposal site as study area, a hydrogeo- logic migration function is constructed. Several hydrogeologic parameters such as vertical dispersity, diffusion coefficient, flow velocity, simulated groundwater concentrations are discussed,and distribution coefficient of granites particles in the study area was measured by using batch method. Meanwhile the conditions after the uranium entered into the groundwater were simulated and predicted by using American hydrologic modeling software PHREEQC-Ⅱ. The different roles of the various influential faetors such as the pH values, dispersity and diffusion coefficient in the simulation are analyzed. The results show that pH values, dispersity and diffusion coefficient have an important influence on the nuclide migration in the groundwater of study area.

关 键 词：高放射性废物 核素迁移 水文地球化学模拟 批式法 

分 类 号：P641[天文地球—地质矿产勘探]