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

[1]	PUSCH R. Highly compacted sodium bentonite for isolating rock-deposited radioactive waste products[J]. Nuclear Technology，1979，45(9)：153-157.
[2]	王驹，张铁岭. 世界放射性废物地质处置[M]. 北京：原子能出版社，1999.(WANG Ju，ZHANG Tieling. Geological disposal of radioactive waste in the world[M]. Beijing：Atomic Energy Press，1999(in Chinese))
[3]	罗嗣海，钱七虎，周文斌，等. 高放废物深地质处置及其研究概况[J].岩石力学与工程学报，2004，23(5)：831-838.(LUO Sihai，QIAN Qihu，ZHOU Wenbin，et al. Deep geological disposal of high-level nuclear waste and its research outlines[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(5)：831-838.(in Chinese))
[4]	WANG XK，CHEN YX，WU YC. Diffusion of Eu(III) in compacted bentonite-effect of pH，solution concentration and humic acid[J] Applied Radiation and Isotopes，2004，60(6)：963-969.
[5]	GARCÍA-GUTIÉRREZ M，CORMENZANA JL，MISSANAT，et al. Diffusion of strongly sorbing cations(60Co and 152Eu) in compacted FEBEX bentonite[J]. Physics and Chemistry of the Earth，2011，36(17)：1708-1713.
[6]	TORSTENFELT B，ALLARD B. Radionuclide diffusion and mobilitiesin compacted bentonite[R]. [S. l.]：TR83-34，1983.
[7]	LEE JO，CHO WJ，HAHN PS，et al. Effect of dry density on Sr-90 diffusion in a compacted Ca-bentonite for a backfill of radioactive waster repository[J]. Annals of Nuclear Energy，1996，23(9)：121-138.
[8]	SHACKELFORD CD. Laboratory diffusion testing for waste disposal—areview[J]. Journal of Contaminant Hydrology，1991，(7)：177-217.
[9]	VAN GENUCHTEN MT，WIERENGA PJ. Solute dispersion coefficients and retardation factors[C]//Methods of Soil Analysis.KLUTEA ed.New York：American Society of Agronomy，1986：1025-1054.
[10]	陈崇希，李国敏. 地下水溶质运移理论及模型[M].北京：中国地质大学出版社，1996：45-46.(LIChongxi，LI Guomin. Theory and model of solute transport in groundwater[M]. Beijing：China Universityof Geosciences Press，1996：45-46.(in Chinese))
[11]	李韵珠，李保国. 土壤溶质运移[M].北京：科学出版社，1998：277.(LIYunzhu，LI Baoguo. Solute transport in soil[M]. Beijing：Science Press，1998：277.(in Chinese))
[12]	HAMAMOTOS，PERERAM S A，RESURRECCIONA，et al. The solute diffusion coefficient in variably compacted，unsaturated volcanicash soils[J]. Vadose Zone Journal，2009，(8)：942-952.
[13]	CHOWJ，LEE JO，KANG CH. Hydraulic conductivity of bentonite-sand mixtures for a potential backfill material for a high-level radioactive waste repository[J]. Journal of the Korean Nuclear Society，2000，32(5)：495-503.
[14]	ABICHOUT，BENSONH B，EDILT B. Micro-structure and hydraulic conductivity of simulated sand-bentonite mixtures[J]. Clays and Clay Minerals，2002，50(5)：537-545.
[15]	KOMINE H. Simplified evaluation on hydraulic conductivities of sand-bentonite mixture backfill[J].Applied Clay Science，2004，26(1)：13-19.
[16]	AMETA NK，WAYAL AS. Effect of bentonite on permeability of dune sand[J]. Electronic Journal of Geotechnical Engineering，2008，13(A)：1-7.
[17]	张虎元，赵天宇，卢一亭，等. 膨胀条件下混合型缓冲回填材料的渗透特性[J]. 岩石力学与工程学报，2011，30(增1)：3149-3156.(ZHANG Huyuan，ZHAO Tianyu，LU Yiting，et al. Permeability of bentonite-sand mixtures as backfill/buffer material in HLW disposal under swelling conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(Supp.1)：3149-3156.(in Chinese))
[18]	WANG X K，TAN X L，NING Q L，et al.Simulation of radionuclides 99Tc and 243Am migration in compacted bentonite[J]. Applied Radiation and Isotopes，2005，62(5)：759-764.