Study on the heat and deformation characteristics of an expressway embankment with shady and sunny slopes in warm and ice-rich permafrost regions

Luo, Xiaoxiao; Yu, Qihao; Ma, Qinguo; Guo, Lei

doi:10.1016/j.trgeo.2020.100390

Cited by 35 publications

(12 citation statements)

References 22 publications

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“…The temperature boundary condition at the ground surface is affected by air temperature, solar radiation, wind speed, rainfall, etc (Luo et al, 2020). Based on the adherent layer theory (Zhu, 1988), considering global warming, the temperature boundary at the ground surface can be expressed as Eq.…”

Section: Model Validationmentioning

confidence: 99%

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Lan

Xia

et al. 2022

Front. Environ. Sci.

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As the heat exchange interface between atmosphere and permafrost, land cover regulates the influence of climate warming on permafrost. With the development of desertification on the Qinghai-Tibetan Plateau (QTP), aeolian sand has emerged as a significant environmental factor influencing the hydrothermal process of permafrost. To reveal the hydro-thermal process within aeolian sand layer and the thermal effect of sand layer on permafrost in the QTP, a coupled hydro-thermo-vapor model considering rainfall and evaporation was established, and the long-term hydrothermal variation of stratum covered by aeolian sand were analyzed. The results show that: 1) Aeolian sand layer is conducive to alleviating permafrost degradation. The alleviation effect is related to the thickness of sand layer. 2) Water redistribution in sand layer and water accumulation in stratum are connected to thickness of sand layer. For the thin sand layer, the water content is low and remains unchanged in different years. The thick sand layer, acting as a permeability diode, makes the degree of water accumulation in sand layer considerable and the water storage of the stratum increase continuously. 3) When the sand layer becomes thicker, the increment of the equivalent thermal conductivity in cold season is larger than that in warm season, which will lead to the decrease of annual conductive heat. 4) In thin sand layer, heat convection and heat conduction are relatively small in the early stage, and heat conduction is the primary mode in the long term. In thick sand layer, heat transfer is dominated by heat convection and heat conduction in the early stage, but it is primarily reliant on heat convection in the long term.

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Section: Model Validationmentioning

confidence: 99%

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Lan

Xia

et al. 2022

Front. Environ. Sci.

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“…Compared with Qinghai-Tibet highway, the pavement width of expressway is increased largely, the mean annual heat flux at the embankment bottom was increased by 60%, and the increased heat flux was mainly concentrated at the embankment center, generating "heat accumulation effect" and accelerating the warming and degeneration of the underlying permafrost significantly [22][23][24][25]. The settlement and differential deformation of the expressway embankment could be approximately 1.33-2.5 times and 1.3-1.94 times of the Qinghai-Tibet highway in warm permafrost regions [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics resembling thermal semiconductor of expressway embankment with ventilation and open-block layer in warm and high-altitude permafrost regions

Yuan,

Yu,

et al. 2024

Preprint

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Active cooling measures has been widely used to protect the underlying permafrost and maintain the embankment stability. Based on the measured data of high-grade highway experimental demonstration engineering in the Beiluhe area on the Qinghai-Tibet Plateau, the heat transfer process and ground temperature response have been analyzed to reveal the thermal control mechanism of the expressway embankment with ventilation and open block layer. (1) Heat was transferred through the block layer in both horizontal and vertical directions by different driving modes. In the horizontal direction, heat was transferred by forced convection under the driving of the local prevailing wind. In the vertical direction, heat was transferred upward by natural convection in the cold season and downward by heat conduction in the warm season under the driving of temperature gradient between the upper and lower boundaries of the block layer. (2) The expressway embankment structure showed the thermal semiconductor effect in both directions. The horizontal and vertical equivalent heat conductivity in the cold period was approximately 6.25 times and 3.5 times of that in the warm period. (3) The underlying frozen soil foundation was provided a net heat released state, and the total released heat was approximately 1.2 times of the total heat absorption. As the result, thick and wide cold permafrost layer (T<-1.0℃) was generated gradually, permafrost table increased and ground temperature decreased generally. This expressway embankment with ventilation duct and block layer contributed to protect the underlying permafrost layer and improve the stability of the frozen soil foundation in the warm and high-altitude permafrost regions.

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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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Study on the heat and deformation characteristics of an expressway embankment with shady and sunny slopes in warm and ice-rich permafrost regions

Cited by 35 publications

References 22 publications

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

The hydrothermal process of aeolian sand and its thermal effect on permafrost in Qinghai-Tibetan Plateau considering rainfall and evaporation under climate warming

Heat transfer characteristics resembling thermal semiconductor of expressway embankment with ventilation and open-block layer in warm and high-altitude permafrost regions

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

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