多年冻土区宽幅路基热效应防治对策研究

发布时间：2018-12-12 02:45

【摘要】：为了解决多年冻土区由于路基加宽而产生的热效应问题,采用数值模拟方法,通过分析融化深度、融化速率以及融化盘形态随路基宽度的变化规律,对宽幅路基热效应特征进行了系统阐述,基于对传统单一工程措施的综合评价,根据各自的适应条件及作用机理提出了2种工程防治对策,并对13.5m幅宽实体工程的地温观测数据进行了分析。结果表明:块石-通风管路基活动层范围内地温有明显下降,降幅为0.1℃~0.4℃;热棒-XPS板路基在路面下2~5m范围内,观测断面地温明显低于对比断面,最大相差约0.8℃,2种复合工程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,目前已在共和至玉树高速公路建设中进行了推广应用。
[Abstract]:In order to solve the problem of thermal effect caused by embankment widening in permafrost region, a numerical simulation method is used to analyze the variation of melting depth, melting rate and the shape of thawing disk with the width of roadbed. The characteristics of thermal effect of wide embankment are systematically expounded. Based on the comprehensive evaluation of traditional single engineering measures, two kinds of engineering prevention and control countermeasures are put forward according to their respective adaptive conditions and action mechanism. The ground temperature observation data of the solid engineering with a width of 13.5m are analyzed. The results show that the ground temperature in the active layer of the boulder-ventilator subgrade decreases obviously by 0.1 鈩，

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