路基填筑短期内热棒高导热性影响  

Influence of High Thermal Conductivity of Thermal Pipe in a Short Period of Subgrade Filling

作　　者：韩长玉[1] 赵浩汀 Han Changyu;Zhao Haoting(School of Civil Engineering and Architecture,Henan University,Kaifeng 475000,Henan,China)

机构地区：[1]河南大学土木建筑学院,河南开封475000

出　　处：《吉林大学学报（地球科学版）》2024年第2期570-580,共11页Journal of Jilin University：Earth Science Edition

基　　金：河南省科技厅项目(182102310737,192102310466);河南省教育厅项目(16A560002)。

摘　　要：为研究多年冻土区路基填筑短期内热棒高导热性对路基下部冻土温度场的影响,基于水热耦合作用,采用数值模拟方法对路基填筑短期内温度场变化进行了分析。结果表明:受热棒高导热性影响,路基填筑短期内冻结锋面沿热棒下凹;6月填筑,易使坡脚和蒸发段处发生水热侵蚀,7月填筑,冻结锋面最低点深度超过热棒埋置深度,对热棒稳定性最不利,8月和9月填筑,热棒高导热性影响时间较短;热棒高导热性对温度场的负面影响随填料温度和热棒材料导热系数的增加而增大。为减少填筑短期内热棒高导热性影响,应避免在6到7月份施工,施工时尽量降低路基填料温度,在不影响降温效果的前提下可适当减小热棒材料的导热系数。To study the influence of high thermal conductivity of thermal pipe on the temperature field of frozen soil under the subgrade in permafrost regions in the short term after subgrade filling,the temperature field change in the short term after subgrade filling was studied by numerical simulation method based on the coupling effect of water and heat.The results show that,due to the high thermal conductivity of the thermal pipe,the frozen front of the subgrade is concave along the thermal pipe in the short term after filling.Filling in June is easy to cause hydrothermal erosion at the slope toe and evaporation section;Filling in July,the lowest point of the freezing front is deeper than the embedded depth of the thermal pipe,which is the most unfavorable for the stability of the thermal pipe;Filling in August and September,the influence time of high thermal conductivity of hot rod is short.The effect of high thermal conductivity of thermal pipe on temperature field increases with the increase of filler temperature and thermal conductivity.In order to reduce the impact of high thermal conductivity of the thermal pipe in the short term after filling,construction from June to July should be avoided.During construction,the temperature of subgrade filler should be reduced as much as possible,and the thermal conductivity of the material can be appropriately reduced without affecting the cooling effect.

关 键 词：多年冻土 热棒 高导热性 温度场 数值模拟 

分 类 号：TU445[建筑科学—岩土工程]