Eu(III)在膨润土–砂混合物中的迁移试验研究

doi:10.13722/j.cnki.jrme.2014.s2.095

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摘要高放废弃物长期地质处置之后，包封核素的金属罐将逐渐发生破坏，核素将会通过缓冲回填材料向外迁移。核素在缓冲回填材料中的扩散系数可作为评价处置库工程屏障阻隔核素性能的重要指标。在考虑对流、弥散及吸附作用条件下，试验采用2.0×10－5 mol/L的Eu(III)溶液作为入渗溶液，研究Eu(III)在膨润土–砂混合物中的迁移过程，并用对流–弥散方程模拟该迁移过程。试验所得的浓度曲线符合相应条件下对流–弥散方程的解，用相应条件下方程的解得到Eu(III)在膨润土–砂混合物试样中的有效扩散系数De = 1.62×10－12～4.87×10－12 m2/s，表观扩散系数Da = 1.44×10－14～9.41×10－14 m2/s；同时，分析掺砂率对扩散系数的影响。在此基础上，分析Eu(III)在缓冲回填材料中的迁移长度与迁移时间的关系，试图为缓冲回填材料设计提供参考。

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	周浪
	张虎元
	陈航
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关键词 ：土力学；Eu(III)；膨润土&ndash, 砂混合物；对流&ndash, 弥散方程；扩散系数；高放废弃物

Abstract：Radionuclides will diffuse to the outside after the overpack has been destroyed in the high level radioactive waste(HLW) disposal. The diffusion coefficient of radionuclides in buffer backfilling material plays an important role in evaluating the property of the engineering barrier of disposal repository in HLW disposal. Taking 2.0×10－5 mol/L of Eu(III) solution as influent，the migration of Eu(III) in compacted GMZ bentonite-sand mixtures is studied under the conditions of convection，diffusion and adsorption；and the migration progress is modeled by the convection-dispersion equation. The fitting curves can fit the test data very well，which confirms the validity of experimental method. The effective diffusion coefficients and apparent diffusion coefficients of Eu(III) in compacted GMZ bentonite-sand mixtures are De = 1.62×10－12–4.87×10－12 m2/s，Da = 1.44×10－14–9.41×10－14 m2/s，respectively. And then，the effect of sand ratio on apparent diffusion coefficient is discussed. The research results can be used to forecast the relationship between migration length of Eu(III) in buffer backfilling material with time and provide a reference for the design of buffer backfilling material for HLW disposal in China.

Key words： soil mechanics Eu(III) bentonite-sand mixtures convection-dispersion equation diffusion coefficient high level radioactive waste

引用本文:

周浪，张虎元，陈航，闫铭. Eu(III)在膨润土–砂混合物中的迁移试验研究[J]. 岩石力学与工程学报, 2014, 33(S2): 4163-4167.
ZHOU Lang，ZHANG Huyuan，CHEN Hang，YAN Ming. LABORATORY RESEARCH ON MIGRATION OF EU(III) IN COMPACTED GMZ BENTONITE-SAND MIXTURES. , 2014, 33(S2): 4163-4167.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.095 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/4163

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