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。
In order to solve the thermal effect problem induced by widening embankment in permafrost regions,the thermal effect characteristics of wide embankment were systematically investigated through numerically analyzing the changes of thawing depth,thawing rate and thawing interlayer form with embankment width.Based on the evaluation on traditional single engineering measure,two types of control countermeasures were proposed according to their applicable conditions and working mechanisms.The geothermal monitoring data from a 13.5 m wide entity engineering were analyzed.The results show that the ground temperature within the active layer of ventiduct embankment with crush-based rock has significant decline with an extension of 0.1℃to 0.4℃.The XPS insulation embankment with thermosyphon indicates that the ground temperature beneath the central line within the range of 2to 5mis significantly lower than that of the comparative section,the maximum difference between which is up to 0.8℃.The two types of composite engineering measures can play agood role in adjusting ground temperature and preventing thermal effect of the wide asphalt pavement,which have been applied in the construction of the Gonghe-Yushu Expressway.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2015年第12期26-32,共7页
China Journal of Highway and Transport
基金
"十二五"国家科技支撑计划项目(2014BAG05B01
2014BAG05B03)
交通运输部重大科技专项项目(2013 318 490 010)
关键词
道路工程
复合路基
数值模拟
实体工程
对策
多年冻土
road engineering
composite embankment
numerical simulation
entity engineering
countermeasure
permafrost
