高温多年冻土区公路通风管路基传热特征分析  

Analysis on Heat Transfer Characteristics of Highway Duct-ventilated Embankment in High Temperature Permafrost Regions

作　　者：朱东鹏[1] 袁堃[1] 陈建兵[1] 谷志文[1] 刘戈[1] 

机构地区：[1]中交第一公路勘察设计研究院有限公司多年冻土区公路建设与养护技术交通行业重点实验室,陕西西安710065

出　　处：《中国公路学报》2015年第12期69-77,共9页China Journal of Highway and Transport

基　　金："十二五"国家科技支撑计划项目(2014BAG05B03);交通运输部重大科技专项项目(2013 318 490 010);交通运输部建设科技项目(2012 319 495 030)

摘　　要：为了给高温多年冻土地区通风管路基建设提供参考,根据青海省共和至玉树高等级公路现场监测数据,研究了通风管路基的传热特征,揭示不同季节通风管管内温度变化过程,分析了冻土上限附近热流密度状况。研究结果表明:冷季时通风管路基底部地温低至-6℃,通风管将外界冷空气的冷量直接引导至路基底部,对下伏冻土层产生了主动冷却效果;在2年的观测期内,路基下伏多年冻土层地温未出现明显变化,冻土上限保持稳定;与同期天然孔地温相比,路基底层下5m附近的土层出现了约0.3℃的升温,但该升温过程在通风管路基建设完成后初期已完成,随后趋于稳定,冻土热状况较为稳定;暖季时通风管的吸热强度是冷季放热强度的2.4倍,1年的吸热量约为7.76 MJ·m-2,通风管路基整体处于缓慢吸热状态。In order to provide reference for the construction of duct-ventilated embankment in high temperature permafrost regions,heat transfer characteristics of duct-ventilated embankment,the temperature change process within ventilated duct in different seasons and heat flux condition near permafrost table were analyzed based on the in-situ test data of Gonghe-Yushu Highway in Qinghai Province.The results show that the lowest ground temperature at bottom of the ductventilated embankment is to-6 ℃in cold season,which means that cooling capacity caused by ventilated duct is entering into the subgrade.It is cooling the permafrost beneath the embankment.The ground temperature of permafrost under the embankment doesn＇t appear obvious change in 2-year monitoring period,and the depth of permafrost table remains stable.Compared with the natural ground borehole in the same period,the ground temperature of 5 m beneath the upper of embankment rises about 0.3℃.However,this temperature-rise process has completed before the duct-ventilated embankment is constructed,and the thermal regime of permafrost is stable afterwards.The heat absorption strength of duct-ventilated embankment inwarm season is 2.4times than that cooling strength in cold season.About 7.76MJ·m-2 of heat quantity has absorbed by duct-ventilated embankment in whole year,which means the ductventilated embankment is in the slow absorbing heat state.

关 键 词：道路工程 传热特征 试验路监测 通风管路基 高温多年冻土 

分 类 号：U416.168[交通运输工程—道路与铁道工程]