温度对花岗岩导热系数的影响研究  

Study on the influence of temperature on the thermal conductivity of granite

作　　者：贵仁 李建中[1,2] 胡天杨 张玉炘 舒彪[1,2] GUI Ren;LI Jianzhong;HU Tianyang;ZHANG Yuxing;SHU Biao(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083

出　　处：《铁道科学与工程学报》2020年第8期1986-1992,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金面上项目(41572269)。

摘　　要：为查明温度对花岗岩导热系数的影响,基于DRE-2C导热系数测试仪测试花岗岩温度从常温到110℃下的饱和和干燥状态下的导热系数,并与理论结果进行对比,研究结果表明:随着温度的升高,完整花岗岩和单裂隙花岗岩在干燥和饱和状态下的导热系数先随着温度的升高而迅速降低,当到达一定温度后,随着温度升高,导热系数的变化幅度较为缓慢;对比饱和状态和干燥状态下的完整花岗岩和单裂隙花岗岩,均可发现在相同温度下饱和状态下的岩样导热系数大于干燥状态下的导热系数。平直光滑的单裂隙花岗岩在裂隙充满水的情况下,其在不同温度下的等效导热系数与花岗岩在不同温度下导热系数和厚度以及水在不同温度下的导热系数有关。In order to find out the influence of temperature on the thermal conductivity of granite,this paper tested the thermal conductivity of granite temperature from saturated and dry state at normal temperature-110℃based on DRE-2C thermal conductivity tester,and compared it with theoretical results.The following results were obtained:with the increase of temperature,the thermal conductivity of intact granite and single-fractured granite decreases rapidly with the increase of temperature at the initial stage.When the temperature reaches a certain level,the thermal conductivity changes with the increase of temperature but at a slow rate.By comparing the saturated granite and the single-fractured granite in the saturated state and the dry state,it can be found that the thermal conductivity of the rock sample under saturated state at the same temperature is greater than that of the dry state.As for straight and smooth single-fractured granite,when the fracture is filled with water,its equivalent thermal conductivity at different temperatures is only related to the thermal conductivity and thickness of the granite at different temperatures and the thermal conductivity of water at different temperatures.

关 键 词：干热岩 温度 导热系数 单裂隙花岗岩 

分 类 号：TU521.21[建筑科学—建筑技术科学]