透壁通风管路堤土体蒸发降温的试验研究  

Laboratory investigation on water evaporative cooling effect in embankment with perforated ventilation pipe

作　　者：章金钊[1] 孙斌祥[2] 刘琦[1,2] 杨丽君[1,2] 汪双杰[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,西安710075 [2]绍兴文理学院土木工程系,浙江绍兴312000

出　　处：《岩土力学》2011年第6期1813-1818,共6页Rock and Soil Mechanics

基　　金：中交多年冻土区公路建设与养护技术交通行业重点实验室基金项目资助(No.HSKF2007-03;No.HSKF2007-05);国家自然科学基金项目资助(No.40772194)。

摘　　要：以多年冻土区透壁通风管路堤为研究对象,进行了路堤蒸发降温效果的室内试验,分析了土体水分蒸发对路堤降温效果的影响机制。分析结果表明,路堤通风期间的水分主要通过裸露在管壁小孔的土体表面直接蒸发,其有利于降低路堤温度。暖季空气与管壁的对流换热效应可使路堤土体增温,同时,通过管壁小孔的水分蒸发散热将对路堤产生降温效应,由于融土的未冻水含量较大,使得通过管壁小孔的水分蒸发散热降温作用也较大,这使透壁通风管路堤总体显现出降温效果。For the duct-ventilated embankment with a perforated ventilation pipe in permafrost regions,the laboratory experiment on the moisture evaporative cooling effectiveness was performed.The mechanism of moisture evaporation affecting on the cooling effect of duct-ventilated embankment was analyzed.It is shown that during the ventilating period water content in the embankment soil is directly evaporated from the soil surface bared in the small holes of the perforated pipe wall,thus to cool down the embankment soil.During warm time,convective heat transfer between the ambient air and the pipe wall may raise the embankment soil temperature,whereas evaporation heat removal from the small holes of the pipe wall can cool down the embankment.During warm time,the water evaporative cooling capability from the small holes of the pipe wall is stronger due to big unfrozen water content in the unfrozen soil,thus,as a whole,revealing the cooling effect in the perforated ventilation pipe embankment.

关 键 词：冻土路堤 透壁通风管 蒸发散热 降温效果 

分 类 号：U213.1[交通运输工程—道路与铁道工程] TU445[建筑科学—岩土工程]