A self-adaption horizontal thermosyphon technology in uneven thermal control of roadway embankments in sub-arctic permafrost regions

Pei, Wansheng; Zhang, Mingyi; Lai, Yuanming; Zhang, Xiong; Luo, Tao

doi:10.1016/j.trgeo.2021.100714

Cited by 14 publications

(9 citation statements)

References 45 publications

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“…The ground temperature distribution of the new roadbed is symmetrical along the centerline, making it suitable for use in permafrost regions and meeting the required geotemperature distribution criteria. This has been confirmed by laboratory tests [13].…”

Section: Horizontal Tpctssupporting

confidence: 66%

“…In the permafrost region, depending on the shape of the TPCT, TPCTs can be approximately classified into straight TPCTs (straight or slant insert) [41], L-shaped TPCTs [32], horizontal TPCTs [13], hairpin TPCTs [42], and TMD-5 type [43]. In China, USA and Canada, the evaporation section of the TPCT tends to be straight, with an adjustable tilt angle and without fins, while the condensing section is a straight pipe with fins.…”

Section: Geometric Shapementioning

confidence: 99%

“…(2) The asymmetric geotemperature distribution under the roadbeds caused by the TPCTs can affect their stability [13]. As shown in Figure 6, the area is near the TPCTs where the temperature is lower than the rest area which causes the frost heaven in winter.…”

Section: Limitations Of the Tpctmentioning

confidence: 99%

“…The Two-Phase Closed Thermosyphon Technique (TPCT) is one of the most efficient and cost-effective measures. The TPCT can prevent permafrost degradation to some extent and has been used in permafrost regions [10][11][12][13]. However, damage still occurs.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Du,

2024

Preprint

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Permafrost covers about 23% ~ 25% of the land in the northern hemisphere, mainly in Russia, Canada, Alaska, Northeast and Qinghai Tibet Plateau (QTP) in China. Many engineering especially the transportation has been in the permafrost regions above. Under the action of highways construction and global warming, permafrost under infrastructures is degraded and causes serious damage. Two phases closed thermosyphon (TPCT) is a widely accepted green countermeasure against the problem in permafrost regions. Although it has been applied to prevent permafrost degradation, their application presents significant challenges on account of the stronger endothermic action of asphalt pavement. This paper focused on the thermosyphon technology and application in the permafrost. Moreover, the article highlighted the excellent working performance of the TPCT that improving the stability of the infrastructures and prevent it degrading due its excellent efficiency of heat transfer. The industrial applications of the TPCT were also summarized, along with their limitations. Finally, the results reported in this paper can provide a valuable guidance for the design of the TPCT and construction of the permafrost regions in the future.

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Section: Horizontal Tpctssupporting

confidence: 66%

Section: Geometric Shapementioning

confidence: 99%

Section: Limitations Of the Tpctmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Du,

2024

Preprint

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“…Numerous studies have shown that deformations of, for example, railroad tracks or roadbeds built on permafrost are caused by thawing and subsidence of permafrost soils at the base of the bed [1][2][3][4][5][6][7][8][9]. Thawing usually occurs under high and wide embankments, which is facilitated by the low albedo (8...12%) of solar radiation of soils, granites, and pebbles at the base of the roadbed.…”

Section: Introductionmentioning

confidence: 99%

Year-round thermal stabilization of permafrost soils during road construction in the northern climatic zone of Russia

Moiseev

Komarova²,

Petryaev

2023

E3S Web Conf.

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The device for year-round cooling of permafrost soils is designed to ensure the construction and operation of roads and railroads in the tundra zone. It includes pipes buried in the ground near the roadbed, a wind turbine powering an electric current generator, an absorption-type cooling unit, and an exhaust fan ensuring the flow of atmospheric air through the pipes. During the long and cold winter, the pipes laid in the ground provide deep freezing of the ground beneath a thick layer of snow. In spring and autumn, at temperatures close to 0°C, the air in the pipes is forcibly cooled by the cooling unit. In summer, at air temperatures exceeding 10°С, air movement through the pipes is blocked. In conditions of short summer, low levels of the sun above the horizon, the high albedo of snow and ice, and their low thermal conductivity, snow deposits remain on the ground throughout the summer period, and in the subsequent winters, accompanied by snowfalls, they intensify. Around a roadway built on permafrost, a protective snow layer is formed, preventing the flow of heat from the atmosphere and solar radiation into the ground. The protective layer can exist for decades, even if the Earth’s climate changes globally. The article presents hydraulic and thermal calculations, explaining the operation of the device in question.

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Field observations on hydro-thermal regimes of loess cut slopes in cold and arid regions: A comparative study of sunny and shady slopes

Zhang

et al. 2023

Cold Regions Science and Technology

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A self-adaption horizontal thermosyphon technology in uneven thermal control of roadway embankments in sub-arctic permafrost regions

Cited by 14 publications

References 45 publications

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Year-round thermal stabilization of permafrost soils during road construction in the northern climatic zone of Russia

Field observations on hydro-thermal regimes of loess cut slopes in cold and arid regions: A comparative study of sunny and shady slopes

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