透壁通风管路堤土体蒸发降温的试验研究

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

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

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 so...