多年冻土路基地温监测及热棒降温分析  

Ground temperature monitoring and the analysis of hot rod cooling for permafrost roadbed

作　　者：李钰 刘金修 李泽 周德平 Li Yu;Liu Jinxiu;Li Ze;Zhou Deping(Xinjiang Academy of Transportation Science,Urumqi 830000,China;CCCC First Highway Consultants Co.,Ltd.,Xi'an 710075,China)

机构地区：[1]新疆交通科学研究院,乌鲁木齐830000 [2]中交第一公路勘察设计研究院有限公司,西安710075

出　　处：《工程勘察》2020年第10期11-16,共6页Geotechnical Investigation & Surveying

摘　　要：为了研究多年冻土区地温变化规律及L型热棒温度调控效能,以公路热棒群降温工程措施为研究对象,通过热传导理论和非线性分析方法,建立了不同监测时段的地温波动预测模型,评价了利用热棒工程措施处治试验段多年冻土路基的降温能效。研究结果表明:热棒作用范围较大,有效影响半径可达5.25m。不同监测时段的冻土地温变化规律略有区别,深度在6m范围内,各测孔地温变化最大降幅达82.1%,6m以下深度范围内,地温逐渐趋于0℃以下。热棒作用初期,多年冻土路基横向地温呈差异化分布,但随着热棒温控效应的增强,有效影响半径内温度调控效果明显,横向地温分布差异性减弱,逐渐趋于较稳定的年平均地温。多年冻土区地温预测值与实测值相关系数均在0.99以上,预测效果良好。研究成果可为冻土路基地温预测、变形监测和降温措施制定提供借鉴。In order to study the law of ground temperature variation in the permafrost region and the effect of L-shaped thermal rod temperature regulation,the thermal rod group cooling project adopted for the highway is taken as the study object.The thermal conduction theory and nonlinear analysis method are used to establish the ground temperature fluctuation prediction models in different monitoring periods.The cooling energy efficiency of the permafrost in the test section treated with hot rod engineering measures is evaluated.The study results show that the affecting range of hot rods is large and the effective radius is up to 5.25 m.There are slight differences in the law of temperature variation in frozen soils during different monitoring periods.Within depth 6 m,the maximum temperature drop of monitoring holes is 82.1%.The ground temperature gradually goes below 0℃below the depth range of 6 m.At the initial stage of hot rod action,the lateral ground temperature of the permafrost roadbed presents a differential distribution.But with the increase of the thermal rod temperature control effect,the effect of temperature regulation in effective influence radius is obvious,and the differential distribution of the horizontal temperature is weakened,and gradually tends to stable annual average temperature.The correlation coefficient between the predicted and measured values of permafrost ground temperature exceeds 0.99,and the prediction effect is good.The study results could provide the reference for the ground temperature prediction,deformation monitoring and cooling measures in permafrost subgrade.

关 键 词：道路工程 地温预测模型 非线性回归分析 热棒降温效能 

分 类 号：TU445[建筑科学—岩土工程] U419.92[建筑科学—土工工程]