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极端低温天气及其对道路结构温度-湿度分布规律的影响

, PP. 15-22

Keywords: 道路工程,道路结构,统计模型,极端低温,温度分布特性,湿度分布特性

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Abstract:

?为研究极端低温天气对道路结构温度湿度分布规律的影响,以哈尔滨地区冬季气象条件为研究对象,开展了极端低温天气表征参数分布规律的研究,提出了表征冬季极端低温天气各参数的95%分位阈值;在此基础上,基于观测数据分析了冬季极端低温天气对道路结构温度湿度分布规律的影响。结果表明:极端最低气温与极端连续5d最低气温均值显著影响道路结构不同深度的温度分布和道路结构的冻结深度;极端降温速率可显著改变路表附近的温度变化速率;道路结构内部湿度分布特性在冻融日内随着温度的变化而产生剧烈改变,极端冻融日数将引起道路结构一定深度处含水量的反复升降,加剧道路结构的冻融破坏。

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