化学-力学耦合作用下膨润土微观和宏观结构的可逆性

Kunlin Ruan, De’an Sun, Xianlei Fu, Hailong Wang, H. Komine, D. Ito
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引用次数: 0

摘要

采用压实膨润土作为缓冲材料,在深部地质处置堆中处理高放核废料。在水库长期运行过程中,压实膨润土的体积变化特性受以下几个因素的影响:(1)地下水位变化引起的入渗液浓度变化;(2)由于不可预测的地质构造活动和封闭条件下缓冲物质膨胀产生的应力,附加应力发生了变化。因此,研究化学-力学耦合对压实膨润土体积变化特性的影响至关重要。为了模拟不同的化学-力学耦合条件,对不同浓度的蒸馏水(DIW)和NaCl溶液进行了连续的膨胀-压缩-回弹试验。并进行了多步盐化脱盐试验。从微观结构到宏观结构研究了压实膨润土的体积变化行为。实验结果表明:(1)压实膨润土的最终膨胀应变和压缩指数随NaCl溶液浓度的增加而减小;(2)对比压实膨润土经过脱盐-盐化循环与未经过脱盐-盐化循环的体积变化行为,发现宏观上塑性性能在一定程度上表现出不可逆性。而微观结构特征具有一定的可逆性和弹性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reversibility of micro and macrostructure in compacted bentonite under chemo-mechanical couplings
Compacted bentonite was selected as buffer material in deep geological repository to deal with high level nuclear waste (HLW). During the long-term operations of repositories, volume change characteristics of compacted bentonite are affected by several factors, for example: (1) Change of the concentration in infiltration liquid caused by the variation of groundwater level; (2) Vary of additional stress owing to the unpredictable geological tectonic activity and the stress generated by the swelling of buffer material in confined condition. Hence, it is very crucial to study the effects of chemo-mechanical couplings on volume change characteristics of compacted bentonite. To simulate different chemo-mechanical coupled conditions, serial swell-compression-rebound tests were performed infiltrated by distilled water (DIW) and NaCl solutions with different concentrations. Multi-step salinization-desalination tests were carried out as well. Volume change behaviors of compacted bentonite were studied from microstructure to macrostructure. Experimental results showed that: (1) Final swelling strain and compression index of compacted bentonite decreased with increasing NaCl solution concentration; (2) Comparing the volume change behaviors of compacted bentonite underwent desalination-salinization cycles to those did not undergo these cycles, it was found that the plastic property at the macro level exhibits irreversible property to a certain extent. While, microstructural characteristics are somewhat reversible and elastic.
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