摘要
压实膨润土导热系数是评价核废料处置库散热安全以及计算温度场分布的关键指标,准确预测不同条件下压实膨润土导热系数对于处置库的安全设计具有重要意义。数值模拟是预测土体导热系数的有效途径之一,然而,由于压实膨润土双孔隙结构的复杂性,基于细观数值模拟的压实膨润土导热模型较少。建立了一种适用于双孔隙压实膨润土导热系数的细观模型,选取了不同含水率和孔隙比下5种典型压实膨润土160个实测导热数据,并与模型预测导热系数值进行比较。结果显示膨润土导热系数的模型预测值基本在实测值±20%范围内,有效验证了模型的可靠性,表明本文模型在压实膨润土导热系数预测方面的潜力。为复杂双孔隙压实膨润土导热系数的精确预测提供了一种新的思路和方法。
The thermal conductivity of compacted bentonite is very crucial in evaluating the safety of heat dissipation and in calculating the temperature distribution of radioactive waste repository.An accurate predictive model is of great significance to the calculation of their thermal conductivity under various conditions.A mesoscale model is proposed for the thermal conductivity of compacted dual-porosity bentonite by numerical simulation.The thermal conductivity of 160 measured samples is selected and compared with their simulated one for five typical kinds of compacted bentonite with different dry densities and water contents.The results show that the most predictive values are within±20%range of the measured ones,which verifies the reliability of the model effectively.The results in this study provide a new approach and/or strategy to predict the thermal conductivity of the compacted dual-porosity bentonite.
作者
周殷康
阎长虹
郑军
谢胜华
项国圣
ZHOU Yin-kang;YAN Chang-hong;ZHENG Jun;XIE Sheng-hua;XIANG Guo-sheng(Anhui University of Technology,Maanshan 243002,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Nanjing Metro Group Co.,Ltd.,Nanjing 210008,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第7期1352-1359,共8页
Chinese Journal of Geotechnical Engineering
基金
江苏省重点研发计划项目(BE2019705)。
关键词
压实膨润土
双孔隙
导热系数
细观模型
compacted bentonite
dual-porosity
thermal conductivity
mesoscale model
作者简介
周殷康(1988-),男,博士,安徽太湖人,主要从事岩土体传热相关的试验和模拟工作。E-mail:Zhouyk@ahut.edu.cn;通信作者:阎长虹,E-mail: yanchh@nju.edu.cn。
