含水率和干密度对黄土热参数影响的试验研究

发布时间：2018-07-17 02:46

【摘要】：黄土的热参数是黄土灾害成因机制研究及热工计算中的重要指标,而含水率和干密度对黄土的热参数具有一定的影响。对不同含水率、不同干密度黄土试样,采用Test Protocol Hot Disk TPS 2500S型热常数分析仪,在常温下开展热参数试验,探讨黄土热参数随含水率及干密度的变化规律。研究结果表明:黄土试样含水率一定时,干密度越大,其导热系数、比热容及热扩散系数也越大;黄土试样的导热系数和比热容随含水率的增大基本呈线性规律增大;当含水率较低时,热扩散系数随含水率的增大而增大;当达到一定含水率时,热扩散系数随含水率的增大而减小;继续增大含水率,热扩散系数趋于稳定。含水率对黄土热参数的影响程度大于干密度对其热参数的影响程度。在热工计算中,可根据土体含水率和干密度动态地选择热参数。
[Abstract]:The thermal parameter of loess is an important index in the study of the formation mechanism of loess disaster and in the calculation of thermal engineering, and the moisture content and dry density have certain influence on the thermal parameter of loess. For loess samples with different moisture content and different dry density, the thermal parameter tests were carried out at room temperature by Test Protocol Hot disk TPS 2500S thermal constant analyzer, and the variation law of loess thermal parameters with moisture content and dry density was discussed. The results show that when the moisture content of loess specimen is constant, the thermal conductivity, specific heat capacity and thermal diffusion coefficient of loess sample increase with the increase of dry density, and the heat conductivity and specific heat capacity of loess sample increase linearly with the increase of water content. When the moisture content is low, the thermal diffusion coefficient increases with the increase of water content; when the water content reaches a certain water content, the thermal diffusion coefficient decreases with the increase of water content; with the increase of water content, the thermal diffusion coefficient tends to be stable. The influence of moisture content on the thermal parameters of loess is greater than that of dry density. In thermal calculation, thermal parameters can be dynamically selected according to soil moisture content and dry density.
【作者单位】：西安科技大学建筑与土木工程学院;
【基金】：国家自然科学基金项目(No.41672305,No.41172262) 陕西省青年科技新星项目(No.KJXX-37) 陕西省重点科技创新团队计划(No.2014KCT-30)~~
【分类号】：TU444

【相似文献】