压实镁橄榄石的热导系数研究
A study on the thermal conductivity of compacted bentonites
摘要：
压实膨润土的热导系数是高放放射性废物贮存库设计中最重要的性能之一，该材料被提议用作缓冲材料。在这里描述的工作中，基于热线法的热探针被用来测量压实的膨润土试样的热导系数。分析了干密度、含水量、滞后性、饱和度和土壤组分体积分数等因素对热导系数的影响。根据实验观察到的空气体积分数与热导系数之间的关系，提出了一种预测压实膨润土热导系数的线性关系式。最后结合几种压实镁铝榴石的实验数据，分析了该关联式与其他现有方法的相关性。
英文摘要：
Thermal conductivity of compacted bentonite is one of the most important properties in the design of high-level radioactive waste repositories where this material is proposed for use as a buffer. In the work described here, a thermal probe based on the hot wire method was used to measure the thermal conductivity of compacted bentonite specimens. The experimental results were analyzed to observe the effects of various factors (i.e. dry density, water content, hysteresis, degree of saturation and volumetric fraction of soil constituents) on the thermal conductivity. A linear correlation was proposed to predict the thermal conductivity of compacted bentonite based on experimentally observed relationship between the volumetric fraction of air and the thermal conductivity. The relevance of this correlation was finally analyzed together with others existing methods using experimental data on several compacted bentonites.
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