高温不稳定多年冻土区片块石路基热状态变化分析  

Analysis of Thermal State Change of Block-stone Subgrade in High-temperature Unstable Permafrost Region

作　　者：王青志 房建宏 徐安花 晁刚 WANG Qingzhi;FANG Jianhong;XU Anhua;CHAO Gang(Qinghai Research Institute of Transportation,Xining,Qinghai 810016,China;Qinghai Research and Observation Base,Key Laboratory of Highway Construction&Maintenance Technology in Permafrost Region,Ministry of Transport,Xining,Qinghai 810016,China;Chang’an University Highway School,Xi’an,Shaanxi 710064,China;Qinghai Communication Technical College,Xining,Qinghai 810003,China)

机构地区：[1]青海省交通科学研究院,青海西宁810016 [2]多年冻土区公路建设与养护技术交通行业重点实验室青海研究观测基地,青海西宁810016 [3]长安大学公路学院,陕西西安710064 [4]青海交通职业技术学院,青海西宁810003

出　　处：《公路工程》2019年第6期66-70,共5页Highway Engineering

基　　金：国家自然科学基金(41801046);青海省自然科学基金(2018-ZJ-959Q);青海省交通科技项目(2019-06)

摘　　要：基于高温不稳定多年冻土区长期温度数据,针对片块石路基温度变化、热收支、冻融循环特征进行了分析。结果表明,片块石层作为主动冷却措施的一种,增加了冷热空气的交换,减少了进入路堤的热量,有效地减少了热扰动对路基下路多年冻土热稳定性的不利影响,但观测期间路基中心下的最大融化深度有逐渐增大趋势,且热量在路基阳坡热收支远大于阴坡,右路肩热收支是左路肩的2.73倍,右坡脚热收支是左坡脚的2.29倍,这种热量差异引起路基阳坡下伏多年冻土升温大于阴坡,导致阳坡冻土上限发展速率明显大于阴坡。Based on the long-term monitoring data of temperature in high temperature unstable permafrost region,this paper analyses the temperature change,heat budget and freeze-thaw cycle characteristics of block-stone subgrade.The results show that,as one of the active cooling measures,the block-stone layer increases the exchange of cold and hot air,reduces the heat entering the emban km ent,and effectively reduces the adverse effect of thermal disturbance on the thermal stability of permafrost.However,during the observation period,the maximum melting depth under the subgrade center increases gradually,and the heat budget on the sunny slope of the subgrade is much larger than that on the shady slope.The heat budget of right shoulder is 2.73 times higher than that of the left shoulder and right toe is 2.29 times higher than that of the left toe.This difference causes the temperature rise of permafrost in the sunny slope of the subgrade to be higher than that of the shady slope,resulting in the development rate of the upper limit of the permafrost on the sunny slope to be significantly higher than that on the shady slope.

关 键 词：多年冻土 片块石路基 热收支 冻土上限 

分 类 号：U41[交通运输工程—道路与铁道工程]