Discrete Element Method Study on Effect of Shear-Induced Anisotropy on Thermal Conductivity of Granular Soils
Discrete Element Method Study on Effect of Shear-Induced Anisotropy on Thermal Conductivity of Granular Soils
复制标题
DOI：
10.1061/(asce)gm.1943-5622.0000165
复制
发表时间：
2013-02
影响因子：
3.7
通讯作者：
U. Shamy;Osman De Leon;R. Wells
中科院分区：
文献类型：
--
作者：
U. Shamy;Osman De Leon;R. Wells
摘要：在这项研究中，利用颗粒间接触处传导传热的简单理想化方法来评估颗粒土壤在受到外部载荷条件下的导热系数。采用这种理想化方法进行离散元法模拟，以检查在固结排水三轴测试环境中加载土壤对土壤导热率的影响。模拟结果表明，剪切引起的各向异性会产生各向异性热导率张量。结果还表明接触密度影响颗粒材料的平均导热率。每个颗粒的平均接触数或配位数越大，热导率就越大。剪切过程中，配位数趋于减少，导致土壤导热系数降低，土质致密时，剪切时导热系数下降幅度较大。
AbstractIn this study, a simple idealization of heat transfer by conduction at the interparticle contacts is utilized for the evaluation of thermal conductivity of granular soils when subjected to external loading conditions. Discrete element method simulations employing this idealization were performed to examine the impact of loading the soil in a consolidated drained triaxial test environment on soil thermal conductivity. Results of conducted simulations show that shear-induced anisotropy results in an anisotropic thermal conductivity tensor. The results also indicate that contact density affects the average thermal conductivity of granular materials. The larger the average number of contacts per particle, or the coordination number, the larger the thermal conductivity. During shearing, the coordination number tends to decrease, resulting in a reduction in soil thermal conductivity with dense soils, showing a larger decrease in thermal conductivity upon shearing.