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Cooling effect analysis of temperature-controlled ventilated embankment in Qinghai-Tibet testing expressway

Published on May 1, 2020in Cold Regions Science and Technology2.767
· DOI :10.1016/J.COLDREGIONS.2020.103012
Zhenyu Zhang1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences),
Qihao Yu13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences)
+ 4 AuthorsGuilong Wu1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences)
Abstract
Abstract 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 °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 °C isotherm was raised by approximately 0.5 m and kept parallel to the embankment base; and a low-temperature zone of −2 °C appeared, and the zone below −1.5 °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.
  • References (28)
  • Citations (1)
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References28
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Abstract Based on monitoring data from the Qinghai-Tibet Testing Expressway (QTTE) in the Beiluhe Basin on the Qinghai-Tibet Plateau, we investigated the deformation mechanism of an expressway embankment in a typical warm and ice-rich permafrost region. Compared with the Qinghai-Tibet Highway (QTH) under similar environmental conditions, the QTTE has the following unique characteristics with respect to thermal effects and embankment deformation: (1) Under the multiplied heat of the QTTE and the ...
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Based on the monitoring data from 13 typical monitoring sites along the Qinghai–Tibet Highway, the degradation characteristics of the permafrost under asphalt pavement and natural ground surface were analyzed with considerations of climate warming and engineering disturbance. Results indicated that the mean annual thawing indexes (MATI) and mean annual freezing indexes (MAFI) of asphalt pavement ranged from 895 to 2,540 °C days and from 290 to 1,097 °C days, respectively, while the MATI and MAFI...
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#1Yinghong Qin (Xida: Guangxi University)H-Index: 12
#2Jiaming Zhang (China University of Geosciences)H-Index: 1
Abstract Duct ventilation, or called air duct, has been used to cool the embankment of the Qinghai–Tibet Railway (QTR). In the past decades, the cooling effect of air ducts has been the subject of numerous investigations, including field observations, innovative designs, and numerical simulations. This review summarizes field observations associated with the cooling effect of air ducts by comparing temperature distributions of duct-ventilated roadbeds with those of earthen roadbeds. Innovative d...
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To construct expressway in western China is growing day by day.Some ways would be through cold regions unavoidably.Because road surface of the expressway has heat absorption area larger than that of normal highway,it is harder to make sure the stability of embankment in cold regions.Generally,it is necessary to take numerical analysis for the stability of embankment in cold regions.However,the conventional finite element methods for stability analysis always make deterministic analysis,which do ...
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Abstract The purpose of this study is to investigate the settlement of the embankment constructed in warm and ice-rich permafrost (WIRP) region along the Qinghai–Tibetan Railway (QTR). In this investigation, an in-situ experiment for the thermal regime under this embankment and for the settlement of the embankment is proposed. The data illustrate that the thicker the embankment fill, the thicker the WIRP layer under the embankment, and the greater the rise of the permafrost temperature, the larg...
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As one part of the National Highway Network Planning in China, the Qinghai-Tibet Expressway (QTE) from Golmud to Lhasa will be built in the interior of the Qinghai-Tibet Plateau (QTP) across about 630 km of permafrost lands. Due to the problematic interactions between the engineering foundations and permafrost, the frozen-soil roadbed of the QTE will be subjected to the more intense thermal disturbances due to the wider black surface. The design and construction for long-term thermal and mechani...
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Abstract In allusion to the problems of the frozen soil engineering geology, the roadbed stability with climate change in construction of the Qinghai–Tibet Railway (QTR), this paper provides overview of the frozen soil engineering problems before and during the QTR constructions. Based on the experiences and lessons learned from the road construction in permafrost areas, the authors recommended that the principle of “positive cooling” of the railroad roadbed by lowering permafrost temperatures s...
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Abstract The temperature-controlled ventilated embankment (TCVE) is an improved engineering measure developed based on the duct-ventilated embankment (DVE). The improved cooling effect of the TCVE is a result of enhanced heat exchange through controlling air convection in the ventilated ducts of the DVE. The field observational data from a TCVE testing section at Beiluhe, about midway in the Qinghai–Tibet Railway permafrost zone, indicates that restricting the air convection in the ducts during ...
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ABSTRACT Monitoring of permafrost along the Qinghai-Tibet (Xizang) Highway shows that there is a large difference in the response of permafrost to climate change and to engineering construction. The change in cold (<−1.5°C) permafrost is greater than that in warm (≥−1.5°C) permafrost under the effect of climate change, while the cold permafrost is less sensitive to the disturbances from engineering activities. However, warm permafrost is very sensitive to both climate warming and the impacts fro...
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