Ca2+盐溶液在高庙子膨润土中的扩散研究

辐射防护 ›› 2022, Vol. 42 ›› Issue (2): 146-154.

Ca²⁺盐溶液在高庙子膨润土中的扩散研究

杨婷^1,2, 杨成艳¹, 郑举功¹, 查文化¹, 梁海安¹, 冯岩岩¹

1.东华理工大学,南昌 330013;
2.核资源与环境国家重点实验室,南昌 330013

收稿日期:2021-10-11 出版日期:2022-03-20 发布日期:2022-04-29
作者简介:杨婷(1980—),女,2009年获东华理工大学材料学硕士学位,2017年获瑞典吕勒奥理工大学博士学位,副教授。E-mail:yt1551@126.com
基金资助:
国家自然科学基金(51869002);放射性地质与勘探技术国防重点学科实验室项目(RGET1811)。

Study on spontaneous diffusion of CaCl₂ solution in GMZ Na-bentonite

YANG Ting^1,2, YANG Chengyan¹, ZHENG Jugong¹, ZHA Wenhua¹, LIANG Haian¹, FENG Yanyan¹

1. East China University of Technology, Nanchang 330013;
2. State Key Laboratory of Nuclear Resources and Environment, Nanchang 330013

Received:2021-10-11 Online:2022-03-20 Published:2022-04-29

摘要/Abstract

摘要： 高放废物地质处置库近场地下水可能会对处置库内的屏障体系产生影响,降低处置库的安全稳定。为研究地下水中盐离子在处置库内缓冲回填体系的扩散规律,本文开展了静态无外荷载条件下内蒙古高庙子(GMZ)膨润土在Ca²⁺盐溶液中自发渗吸的吸附扩散室内试验。从土的微观结构和经典扩散理论对Ca²⁺在不同干密度和初始饱和度的膨润土试样中的自发扩散规律进行了分析。研究结果表明,在膨润土初始饱和度相同的情况下,试样阻滞系数随其干密度增加而增大,此时Ca²⁺的扩散能力减弱;当膨润土干密度相同时,随着初始饱和度的增加基质吸力作用减弱,阻滞系数减小,Ca²⁺的扩散能力减弱。

关键词: 高放废物处置, 钠基膨润土, 自发扩散, 扩散系数, Fick第二定律

Abstract: The groundwater at the near site of the geological disposal repository of high-level radioactive waste may affect the barrier system in the disposal repository and may reduce the safety and stability of the disposal repository. In order to study the diffusion law of salt ions in the groundwater into the buffer backfill system in the disposal repository, the spontaneous imbibition, adsorption and diffusion of Gaomiaozi (GMZ) bentonite from Inner Mongolia in Ca²⁺ solution was carried out in laboratory under static non-external loading condition. The spontaneous diffusion of Ca²⁺ in bentonite samples with different dry densities and initial saturation was analyzed based on soil microstructure and classical diffusion theory. The results showed that under the condition of the same initial saturation of bentonite, the retardation coefficient increases with the increase of dry density, while the diffusion capacity of Ca²⁺ decreases. When the dry density of bentonite was the same, the retardation coefficient and diffusion capacity of Ca²⁺ decrease with the increase of initial saturation.

Key words: HLW geological disposal, Na-bentonite, spontaneous diffusion, diffusion coefficient, the second law of Fick

中图分类号:

TL942+.1

杨婷, 杨成艳, 郑举功, 查文化, 梁海安, 冯岩岩. Ca²⁺盐溶液在高庙子膨润土中的扩散研究[J]. 辐射防护, 2022, 42(2): 146-154.

YANG Ting, YANG Chengyan, ZHENG Jugong, ZHA Wenhua, LIANG Haian, FENG Yanyan. Study on spontaneous diffusion of CaCl₂ solution in GMZ Na-bentonite[J]. RADIATION PROTECTION, 2022, 42(2): 146-154.

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Ca²⁺盐溶液在高庙子膨润土中的扩散研究

Study on spontaneous diffusion of CaCl₂ solution in GMZ Na-bentonite

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