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多年冻土区沥青路面的吸热量与幅宽密切相关,高速公路宽幅沥青路面的吸热量较二级公路将显著增加,并在路基底部中心位置产生“聚热效应”。而传统的冻土工程措施都是针对低等级公路窄幅路基的需求提出的,不能满足高速公路宽幅路基热量调控的使用要求。文中基于沥青路面宽幅热效应的分析,对传统的单一工程措施进行了综合评价,根据各自的适应条件及作用机理提出了两种复合工程措施,并对13.5m幅宽试验工程的地温观测数据进行了分析,研究表明两种复合措施都具有良好的地温调控效果,对宽幅沥青路面的热效应可起到防治作用,目前已在共玉高速公路建设中进行了推广应用。
The endothermic amount of asphalt pavement in permafrost region is closely related to the width of the asphalt pavement. The heat absorption of wide-width asphalt pavement on the expressway is significantly increased compared with that of the second-level road, and the “heat accumulation effect” occurs at the center of the subgrade. However, the traditional permafrost engineering measures are all put forward for the requirements of narrow subgrade of low grade highways and can not meet the requirements for the use of wide subgrade heat regulation of expressways. Based on the analysis of the wide thermal effect of asphalt pavement, a comprehensive evaluation of the traditional single engineering measures was made, and two kinds of composite engineering measures were put forward according to their respective adaptation conditions and mechanism. The ground temperature observation data of the 13.5m width test project The analysis shows that the two compound measures have a good geothermal control effect, which can play a prevention and control role on the thermal effect of wide asphalt pavement. At present, it has been popularized and applied in the construction of Gongyu Expressway.