冻结过程中土体导热系数预测模型  

A Hyperbolic Model for Predicting the Thermal Conductivity of Soil in the Freezing Process

作　　者：段文魁 王来发 晁华俊 明锋 DUAN Wen-kui;WANG Lai-fa;CHAO Fa-jun;MING Feng(Qinghai Provincial Traffic Control Construction Engineering Group Co.Ltd,Xining 810000,Qinghai Province,China;Qinghai Industry Control Development Co.,Ltd.,Xining 810000,Qinghai Province,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu Province,China)

机构地区：[1]青海省交控建设工程集团有限公司,青海西宁810000 [2]青海交控实业发展有限公司,青海西宁810000 [3]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000

出　　处：《中国农村水利水电》2024年第5期47-52,共6页China Rural Water and Hydropower

基　　金：青海省重点研发与转化计划(2023-SF-125);甘肃省科技计划项目(23JRRA615)。

摘　　要：鉴于冻结条件下测量导热系数存在困难,为明确温度对导热系数的影响规律,提出了具有三参数(λ0,a和b)的双曲模型来描述土体导热系数与负温的关系。然后,采用实测导热系数和3种常用模型对新模型的性能进行了评价,并对模型参数进行了敏感性分析。结果表明,双曲线模型能较准确地预测冻结过程中土体导热系数变化规律。在4个模型中,新模型具有最小的均方根误差和相对误差。模型参数与细粒含量密切相关,且随初始体积含水率增大而减小。新模型能够准确描述负温下的土体导热系数变化规律,可为寒区传热传质耦合计算提供基础。Because the thermal conductivity of freezing soil is hard to measure,in order to clarify the influence of temperature on thermal conductivity,a hyperbolic model with three parameters was proposed to describe the relationship between thermal conductivity and negative temperature in this paper.Then,the performance of the new hyperbolic model was verified by the measured thermal conductivity coefficients and three widely used models,and a sensitivity analysis of model parameters was performed.The results show that the hyperbolic model can accurately predict the change pattern of soil thermal conductivity during the freezing process.Among these four models,the proposed hyperbolic model has the smallest root mean square error and relative error.The model parameters are closely related to the fine particle content and decrease as the initial volume moisture content increases.Considering the new model can accurately simulate the variation of thermal conductivity with subzero temperature,it can provide a basis for coupled heat and mass transfer in cold regions.

关 键 词：冻土工程 冻结过程 导热系数 预测模型 

分 类 号：TV49[水利工程—水工结构工程]