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  2022, Vol. 41 Issue (S2): 3488-3498    DOI: 10.13722/j.cnki.jrme.2021.1329
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Study on the cooling effect of separated duct-ventilated embankments used for the Qinghai—Tibet expressway in high-altitude permafrost zones
LI Xiaolin1,MA Wei2,MU Yanhu2,HE Pengfei3,HUANG Yongting4,WU Xiaopeng1
(1. College of Civil Engineering and Architecture,Jiaxing University,Jiaxing,Zhejiang 314001,China;2. State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China;3. School of Science,Lanzhou University of Technology,Lanzhou,Gansu 730000,China;4. Institute of Geological Hazards Prevention,Gansu Academy of Sciences,Lanzhou,Gansu 730000,China)
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Abstract  考虑到宽幅路基的“聚热效应”和复杂的多年冻土环境,拟建青藏高速公路建设所面临的关键问题是如何保证路基的长期热稳定性。基于现场监测数据和传热传质理论,建立分离式通风管路基三维数值模型,分析与预测未来50年通风管在青藏高速公路分离式路基中的工程效果。结果表明:分离式通风管路基具有较好的降温效果,能够保证路基及其下部多年冻土的长期热稳定性。但是,当隔离带宽度小于10 m时,后幅路基管道内部风流变化特征受到隔离带宽度的显著影响,导致其对下部多年冻土的降温效果弱于前幅路基。此外,在隔离带较窄情况下,两幅路基之间隔离带区域存在局地增温效应,将对路基及其下部多年冻土产生严重的热扰动,不仅引起多年冻土上限下降、温度升高,而且增加了路基两侧下部土体温度场的不对称性。尝试将两幅路基通风管连通来弱化局地增温效应,但连通后路基及隔离带区域下部土体的热状况反而更差,说明这种方法未能有效解决局地增温效应的热影响。
Key words土力学      青藏高速公路      分离式通风管路基      降温效果      隔离带宽度      局地增温效应      多年冻土     
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LI Xiaolin1
MA Wei2
MU Yanhu2
HE Pengfei3
HUANG Yongting4
WU Xiaopeng1
Cite this article:   
LI Xiaolin1,MA Wei2,MU Yanhu2, et al. Study on the cooling effect of separated duct-ventilated embankments used for the Qinghai—Tibet expressway in high-altitude permafrost zones[J]. , 2022, 41(S2): 3488-3498.
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