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寒区公路路基温度场的自动监测与特性

, PP. 21-26

Keywords: 道路工程,寒区公路,路基温度场,温度观测系统,冻深

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Abstract:

针对寒区公路路基温度场的观测存在外部环境复杂、自动与连续观测难以实现等困难,采用DS18B20温度传感器、STC89C58单片机、DS12C887时钟和AT24C256外部扩展数据存储器组成观测系统,外接锂电池供电,对路基温度场实现了自动采集、储存和无间断观测。结果表明在冻融循环期内,最大冻深在路基顶面下2.3m,比天然地基深0.85m,说明路基填筑改变了原天然地基温度场的状态;与气温变化时间相比,路基冻深变化在次年3月份达到最大,存在50d左右的滞后期;在路基冻融过程中呈现不均匀现象,融化期内,路基内部存在马鞍形未化冻土区域,并在融化末期产生未化冻土核;其观测结果可作为寒区公路路基病害的分析依据。

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