热棒技术在国道214线共和-玉树高速公路宽幅冻土路基中应用的数值模拟研究
发布时间:2018-03-17 08:49
本文选题:多年冻土 切入点:保温板 出处:《冰川冻土》2014年04期 论文类型:期刊论文
【摘要】:高速公路路基幅面宽度的成倍增加,沥青路面的吸热效应更为显著,工程对其下伏多年冻土的热影响更为显著.热棒、热棒保温板复合结构等传统工程措施能否保护宽幅高速公路下冻土稳定是一个亟待回答的问题.根据带相变热传导有限元方法,对共和-玉树高速普通路基、热棒路基和热棒保温板复合结构路基在未来全球变暖情形下的地温场特征进行了数值模拟分析.结果表明:在年平均气温为-3.5℃或地表年平均温度为-1℃的多年冻土地区,普通路基和热棒路基在全球变暖条件下路基下伏冻土都将发生融化,宽幅公路路基将会产生显著融沉变形,不能保证宽幅公路路基20 a使用期内的稳定性.热棒保温板复式结构显示了较好的冷却路基效果,在第20年路基下多年冻土人为上限高于原天然上限,路基下富冰冻土仍处于冻结状态,可以保证宽幅沥青公路在服务期内的热稳定性.
[Abstract]:As the width of highway embankment increases exponentially, the heat absorption effect of asphalt pavement is more significant, and the thermal effect of engineering on its underlying permafrost is more significant. It is an urgent question whether traditional engineering measures such as thermal insulation board composite structure can protect the stability of frozen soil under wide width expressway. According to the finite element method of heat conduction with phase change, this paper deals with the Gong-Yushu high-speed ordinary roadbed. The characteristics of geothermal field in the future global warming are simulated and analyzed. The results show that in permafrost regions where the annual mean temperature is -3.5 鈩,
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