摘要
土体的热物理参数对浅层地热能开采、工程建筑的施工、设计等都有着重大的意义,研究土体的热物理性质需紧密结合土体的含水量、密度等参数。文章通过现场对徐州浅层土体的导热系数、比热容、导温系数进行测定,结合相关室内实验,对实验数据进行相关拟合,研究并分析了导热系数、比热容、导温系数随密度、含水率的变化特征。研究表明:随着土体密度的增加,导热系数直线递增,比热容先递增后下降,与密度呈二次函数关系;在土体含水率增加的过程中,导热系数先递增后趋于稳定,比热容呈明显的直线递增趋势;土体导温系数的增减取决于导热系数λ和ρc因子(密度和比热容的乘积)的比值,该试验导温系数随含水率和密度整体呈上升趋势。试验结果定量统计了徐州丰县地区热物理性质参数的变化特征,可为地热系统及存在热流传播的地下工程提供理论指导。
The thermophysical parameters of soil are of great significance to the construction of shallow geothermal energy and the construction and design of engineering buildings. Study of the thermophysical parameters involves the relationship between thermal conductivity and water content, density and so on. In this paper, the thermal conductivity, specific heat capacity and thermal diffusivity of the shallow soil in Xuzhou City were investigated by the field and laboratory experiment. The relationship between thermophysical properties and density and moisture content was studied by fitting the experimental data. The results show that with the increase of soil density, the thermal conductivity increases linearly;the specific heat capacity increases first and then decreases, and has a quadratic function relationship with the density. With the increasing soil moisture content, the coefficient of thermal conductivity increases first and then tends to be stable;the specific heat capacity shows a linear increasing trend. The change of soil thermal diffusivity depends on the ratio of λ to ρc factors(the product of density and specific heat capacity). The thermal diffusivity increases with water content and density on the whole in this experiment. The test results quantify the characteristics of the change of thermophysical parameters in Fengxian County, Xuzhou City. The studies could give guidance to the management of geothermal system and the underground project with heat flow transmission.
作者
于宗仁
吕超
孙强
YU Zongren;LYU Chao;SUN Qiang(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2019年第12期1695-1698,1703,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(41672279)
关键词
浅层土
导热系数
比热容
导温系数
shallow soil
thermal conductivity
specific heat capacity
thermal diffusivity
