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