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首页> 外文期刊>Cold regions science and technology >Cooling effect analysis of temperature-controlled ventilated embankment in Qinghai-Tibet testing expressway
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Cooling effect analysis of temperature-controlled ventilated embankment in Qinghai-Tibet testing expressway

机译：青藏试验高速公路温控通风路堤降温效果分析

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摘要

Temperature-controlled ventilated embankment (TCVE) is a feasible air-cooled embankment. It can control the heat transfer mode in ventilated duct of duct ventilated embankment according to the ambient air temperature with auto-temperature-controlled wind doors installed in the duct nozzle. For investigating the cooling performance and engineering effect of TCVE, a prototype testing section of the expressway was constructed on Qinghai-Tibet Plateau. The field observation data showed that the mean air temperature inside the duct in the warm season after installing the doors was about 3 degrees C lower than the temperature before installing the doors. The annual net heat release was 1.4 times than that before installing the doors near the permafrost table. One year after installing the doors, the 0 degrees C isotherm was raised by approximately 0.5 m and kept parallel to the embankment base; and a low-temperature zone of -2 degrees C appeared, and the zone below -1.5 degrees C was approximately 1.3 times than that before installing the doors. With the cooling effect of TCVE, the trend of embankment settlement was retarded, and the frost-heave capacity showed a tendency to decrease. This study verified the effectiveness of TCVE, which has a potential in cooling embankments in expressway construction in permafrost regions.
机译：温控通风路堤（TCVE）是一种可行的风冷路堤。通过安装在风管喷嘴中的自动温度控制风门，可以根据周围空气温度控制风管通风路堤的风管中的传热模式。为了研究TCVE的冷却性能和工程效果，在青藏高原上修建了高速公路的原型试验段。现场观察数据表明，安装门后的暖季风道内的平均空气温度比安装门前的温度低约3摄氏度。年热释放量是在永久冻土台附近安装门之前的1.4倍。门安装一年后，0度等温线升高了约0.5 m，并与路基保持平行。并且出现了-2摄氏度的低温区域，并且-1.5摄氏度以下的区域约为安装门之前的1.3倍。受TCVE的降温作用，路堤沉降趋势得到了抑制，冻胀能力呈现下降趋势。这项研究证实了TCVE的有效性，它在多年冻土地区的高速公路建设中具有冷却路堤的潜力。

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