长江科学院院报2018，Vol.35Issue(3)：45-51,58,8.DOI:10.11988/ckyyb.20171109
热处理北山花岗岩热传导特性研究
Thermal Conductivity Characteristics of Beishan Granite after Thermal Treatment
摘要
Abstract
In deep geological disposal of high-level radioactive waste(HLW),the thermal conductivity of host rock is a key factor in design because it has a direct impact on the repository layout and the optimization of distance be-tween disposal elements. This study aims at investigating the thermal conductivity characteristics of Beishan granite treated with different temperatures ranging between 200 ℃ and 800 ℃. The influence of thermal treatment on the thermal conductivity of Beishan granite is analyzed, and the relations between thermal conductivity and other conventionalphysical parameters are also discussed. The effect of water saturation on the thermal conductivity is revealed asfollows: 1) the thermal conductivity of Beishan granite specimens decays as treatment temperature rises, and the decayrate reaches peak value in the temperature range between 550 ℃ and 650 ℃; 2) as treatment temperature rises,the mass,dry density and P-wave velocity of specimens increase in general while the volume and porosity of specimenspresent an increasing trend; according to the relations between thermal conductivity and P-wave velocity, porosity,and dry density, respectively,models are established to predict the thermal conductivity of thermal-treated specimens;3) before thermal treatment, the thermal conductivity values of saturated specimens increase by 9.7%-12.1% comparedwith those of dry ones,and the thermal conductivity of saturated specimens increases in an approximately lineartrend with the increase of thermal conductivity of dry specimens; 4) on the other hand, when the thermal-treatedspecimens were saturated with water, the thermal conductivity shows a slightly decreasing trend as treatment temperaturerises. We also found that the effect of water saturation on thermal conductivity increases with the increase of rockporosity, and this behavior can be described reasonably using a linear equation. The research achievements provide atheoretical basis for the design and optimization of deep geological disposal engineering.关键词
北山花岗岩/热处理/热传导/高放废物地质处置/饱水效应Key words
Beishan granite/thermal treatment/thermal conductivity/geological disposal of high-level radioactive waste/water saturation effect分类
建筑与水利引用本文复制引用
郭政,赵星光,李鹏飞,谢敬礼,刘月妙..热处理北山花岗岩热传导特性研究[J].长江科学院院报,2018,35(3):45-51,58,8.基金项目
国家自然科学基金项目(11102061) （11102061）
