极端低温天气及其对道路结构温度-湿度分布规律的影响  

Impact of Winter Temperature Extremes on Pavement Temperature and Moisture Distribution Characteristics

作　　者：徐慧宁[1] 谭忆秋[1] 张锐[2] 姚形傲[1] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [2]天津市公路工程总公司,天津300041

出　　处：《中国公路学报》2014年第1期15-22,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51208154);交通运输部西部交通建设科技项目(2013 319 820 220)

摘　　要：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。In order to identify the impact of winter temperature extremes on pavement temperature and moisture distribution characteristics, winter weather in Harbin was selected as study object. The distribution characteristics of winter temperature extreme indices were analyzed. The threshold value for each index with its 95 % confidential level was proposed. Based on the study above, experiments were carried out based on collected data in order to investigate the impacts of winter temperature extremes on pavement temperature and moisture distribution charaeteristies. The results show that both minimum temperature extreme and average minimum temperature extreme for 5 days have significant impact on the pavement temperature distribution and frozen depth. Temperature near pavement surface is easier to be affected by cooling rate of extreme. Additionally, pavement moisture distribution varies sharply in freezing-thawing days. Freezing- thawing days with extreme induce the repeated movements in the moisture content, which will lead to the aggravation of freeze-thaw damage.

关 键 词：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 

分 类 号：U416.2[交通运输工程—道路与铁道工程]