基于热探针测试的橡胶-砂颗粒轻质混合填料导热系数影响因素研究

Influence factors of thermal conductivity of rubber-sand lightweight mixture based on thermal probe test

导热系数是岩土材料热学特性的一个重要参数,文章对橡胶-砂颗粒混合物的进行了大量的热针试验。详细分析含砂率、含水率和干密度对导热系数的影响。结果表明:当含砂量小于20%时,橡胶-砂混合物的导热系数逐渐增加,但砂粒含量超过80%后,导热系数立即出现较高的增加速率;随着干密度的增加,导热系数在低含砂率时呈现抛物线增长,在高含砂率时呈现线性增长;橡胶-砂混合物导热系数随含水率的变化可分为增长区域和稳定区域,6%含水率可作为临界含水率。该文可为地热相关结构周围的轻质回填材料提供更合理的热学参数,此外,废旧轮胎的有效利用可以减少环境污染,促进可持续的基础设施。

Thermal conductivity is an important parameter of the thermal properties of geotechnical materials,the rubber sand mixture is studied by a large number of hot needle test.The influence of sand content,water content and dry density on thermal conductivity is analyzed in detail.The test results show that when the sand content is less than 20%,the thermal conductivity of rubber mixture sand increased gradually,but the sand content is more than 80%,the thermal conductivity immediately higher rate of increase;with the increase of the dry density,thermal conductivity of growth in low sand rate shows a linear growth in the present,with a high rate of sand when the oak;Changes of rubber sand mixture thermal conductivity and water content can be divided into growth region and stability,6%moisture content can be used as the critical moisture content.The study can provide thermal parameters,a more reasonable light around geothermal related structure backfill material in addition,effective utilization of waste tires can reduce environmental pollution and promote sustainable infrastructure.