Zhang Xin Rui, Kong Gang Qiang, Wang Le Hua, Xu Xiao Liang
Key Laboratory of Ministry of Education for Geomechanics and Embankments, Hohai University, Nanjing, P.R. China.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang, P.R. China.
Sci Rep. 2020 Apr 16;10(1):6559. doi: 10.1038/s41598-020-62299-y.
Thermal conductivity of soil is a basic physical property related to heat conduction, and also is one of parameters widely applied in geotechnical engineering. The effect of gradation on the thermal conductivity of fused quartz was analyzed by thermal needle tests. The different particle size with the same uniformity coefficient (C = 3.2) and different uniformity coefficient for the same particle size (0.10~1.00 mm) were considered in this study. It shows that the thermal conductivity of fused quartz decreases with the decreasing of the mean particle size and with the increasing of the porosity. Simple modified methods to estimate the value of thermal conductivity are proposed, and had been demonstrated successfully by conducting fused quartz, carbonate sand and Ottawa sand.
土壤的导热系数是与热传导相关的一项基本物理性质，也是岩土工程中广泛应用的参数之一。通过热针试验分析了级配对熔融石英导热系数的影响。本研究考虑了相同均匀系数（C = 3.2）下不同的粒径以及相同粒径（0.10~1.00 mm）下不同的均匀系数。结果表明，熔融石英的导热系数随平均粒径的减小和孔隙率的增大而降低。提出了估算导热系数值的简单修正方法，并通过对熔融石英、碳酸盐砂和渥太华砂的试验成功进行了验证。
