岩土力学2017，Vol.38Issue(10)：2888-2894,2900,8.DOI:10.16285/j.rsm.2017.10.015
温度对黄土热参数影响的试验研究
Experimental study of influence of temperature on thermal properties of loess
摘要
Abstract
The thermal properties of loess are important in the study of genetic mechanism of freezing-thawing hazard and thermal engineering calculation.However,temperature greatly impacts the thermal behaviors of loess.In this study,the thermal properties of loess samples with different water contents and dry densities are tested using Test Protocol Hot Disk TPS 2500S under different temperatures.The evolution of thermal properties of loess with temperature is discussed.The study reveals the following results.The thermal conductivity development of samples as temperature decreases can be divided into three stages:slowly increasing stage,rapidly increasing stage and stable stage.As temperature decreasing,the specific heat capacity of samples increases initially and then decreases,finally stabilizes.The thermal diffusivity of samples decreases at first and then increases with decreasing temperature.When the temperature is below-20℃,the thermal diffusivity keeps stablc.Thc larger the water content,the greater the influence of temperature on the thermal properties of samples.There exists large difference of thermal properties between unfrozen soil and frozen soil.Dry density impacts n the thermal properties mainly through the minerals and free water content of soil.In applications of freezing-thawing hazard and thermal engineering,thermal properties can be selected in accordance with soil temperature,water content and dry density.Determination of whether the soil is frozen or not is the key to determine the thermal properties.关键词
黄土/热参数/温度/导热系数/比热容/热扩散系数Key words
loess/thermal properties/temperature/thermal conductivity/specific heat capacity/thermal diffusivity分类
建筑与水利引用本文复制引用
董西好,叶万军,杨更社,吴迪,申艳军,刘慧..温度对黄土热参数影响的试验研究[J].岩土力学,2017,38(10):2888-2894,2900,8.基金项目
国家自然科学基金项目(No.41172262) （No.41172262）
教育部新世纪优秀人才支持计划项目(No.NCET-12-1044) （No.NCET-12-1044）
陕西省重点科技创新团队计划资助项目(No.2014KCT-30) （No.2014KCT-30）
博士后基金(No.2016M592816).This work was supported by the National Natural Science Foundation of China (41172262),the Program for New Century Excellent Talents in University (NCET-12-1044),the Key Scientific and Technological Innovation Team Program Funds for Shaanxi Province (2014KCT-30) and the China Postdoctoral Science Foundation (2016M592816). （No.2016M592816）
