摘要
为了确定青藏高原多年冻土地区新建道路设计时工程热影响的范围,以青藏公路为例,应用有限元与无限元耦合的数值计算方法,以土体温差ΔT为评价指标,分析了公路路基热影响的范围及变化规律。研究结果表明:温差ΔT在横向上表现出随横向距离增加而呈抛物线衰减的规律;在垂向深度上以冻土天然上限深度和人为上限深度为界,划分为天然冻土活动层、公路路基影响层以及下伏多年冻土层等3个主要区域;在天然冻土上限深度以上,温差ΔT随深度增加呈对数减小趋势,在天然冻土上限深度与人为上限深度之间,ΔT随深度增加而呈三次方增加,在冻土人为上限趋势深度以下,ΔT随深度增加而呈对数减小趋势。
To determine the heat affected area of engineering for new road construction design in permafrost regions of the Qinghai-Tibet Plateau,the coupling numerical calculation method of infinite element and finite element was used in the Qinghai-Tibet Highway.Based on the temperature differenceΔT,the heat affected area and change rule of roadbed were analyzed.The results show thatΔT manifests a law of parabolic attenuation with the increase of transverse distance in the transverse direction.And on vertical depth,three regions of natural permafrost active layer,highway embankment affected layer and underlying permafrost layer are divided according to natural permafrost table and artificial permafrost table.Within the depth below natural permafrost table,ΔT decreases logarithmically with the increase of depth.Within the depth between natural permafrost table and artificial permafrost table,ΔTincreases as cubic equation with the increase of depth.Within the depth above artificial permafrost table,ΔT decreases logarithmically with the increase of depth.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2015年第12期92-99,142,共9页
China Journal of Highway and Transport
基金
"十二五"国家科技支撑计划项目(2014BAG05B01)
国家重点基础研究发展计划("九七三"计划)项目(2012CB026106)
冻土工程国家重点实验室青年基金项目(SKLFSE-ZQ-20)
关键词
道路工程
热影响范围
数值计算
青藏公路
road engineering
heat affected area
numerical calculation
Qinghai-Tibet Highway
