A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Simulating Temperature Distribution in Soil around the U-shaped Channels in the Yellow River Irrigation Areas in Ningxia of China
【Background】 The Yellow River Irrigation Area built in Ningxia of China comprises a number of irrigation canals that could be damaged by heaves induced by frosts in winter, destabilizing canal slopes and resulting in water leakage. Developing anti-frost technologies to mitigate the heave damage is hence critical to safeguarding the operation of the canals. Soil freezing in the canals is a hydrothermal process involving phase change; it is impacted by topographic, geological and hydrological factors. Understanding temperature distribution in the peripheral soil of the canal can help mitigate heave formation induced by freezing-thawing cycles. 【Objective】 The objective of this paper is to numerically simulate temperature distribution in the soil surrounding the U-shaped concrete canals under different conditions in attempts to provide guidance to help anti-heave design in constructing canals in semi- permafrost regions like Ningxia. 【Method】 The study was based on data measured from U-shaped concrete canals in Shahu Village, Shaogang Town, Qingtongxia City. We first used the AKIMA interpolation to calculate the temperature distribution in the soil around the canals, and then numerically simulated thermal flow and temperature distribution in the soils using the ANSYS software. 【Result】 Since the temperature in the shady slope is much lower than that in the sunny side, frost heave occurred early in the former and the frozen soil in it also developed much deeper. The temperature gradient underneath the lining a different locations around the canal was roughly the same, and in general, the temperature gradient was the highest in regions proximal to the soil surface and decreased with the soil depth. The average temperature gradient in the shady slope was higher than that on the sunny side, and the temperature gradient in the canal base tends to zero as the soil depth increased. The temperature varies more dramatically in the 20 cm of soil underneath the lining, and in soils 50~100 cm from the lining, the temperature gradient was almost zero. Comparison with observed data showed that the AKIMA interpolation combined with the ANSYS software can accurately simulated the temperature distribution. 【Conclusion】 Results obtained from AKIMA and ANSYS were consistent with the measured data and they can be used to help anti-frost design in building U-shaped concrete canals in areas with freezing-thawing cycles in Ningxia and beyond.
Simulating Temperature Distribution in Soil around the U-shaped Channels in the Yellow River Irrigation Areas in Ningxia of China
【Background】 The Yellow River Irrigation Area built in Ningxia of China comprises a number of irrigation canals that could be damaged by heaves induced by frosts in winter, destabilizing canal slopes and resulting in water leakage. Developing anti-frost technologies to mitigate the heave damage is hence critical to safeguarding the operation of the canals. Soil freezing in the canals is a hydrothermal process involving phase change; it is impacted by topographic, geological and hydrological factors. Understanding temperature distribution in the peripheral soil of the canal can help mitigate heave formation induced by freezing-thawing cycles. 【Objective】 The objective of this paper is to numerically simulate temperature distribution in the soil surrounding the U-shaped concrete canals under different conditions in attempts to provide guidance to help anti-heave design in constructing canals in semi- permafrost regions like Ningxia. 【Method】 The study was based on data measured from U-shaped concrete canals in Shahu Village, Shaogang Town, Qingtongxia City. We first used the AKIMA interpolation to calculate the temperature distribution in the soil around the canals, and then numerically simulated thermal flow and temperature distribution in the soils using the ANSYS software. 【Result】 Since the temperature in the shady slope is much lower than that in the sunny side, frost heave occurred early in the former and the frozen soil in it also developed much deeper. The temperature gradient underneath the lining a different locations around the canal was roughly the same, and in general, the temperature gradient was the highest in regions proximal to the soil surface and decreased with the soil depth. The average temperature gradient in the shady slope was higher than that on the sunny side, and the temperature gradient in the canal base tends to zero as the soil depth increased. The temperature varies more dramatically in the 20 cm of soil underneath the lining, and in soils 50~100 cm from the lining, the temperature gradient was almost zero. Comparison with observed data showed that the AKIMA interpolation combined with the ANSYS software can accurately simulated the temperature distribution. 【Conclusion】 Results obtained from AKIMA and ANSYS were consistent with the measured data and they can be used to help anti-frost design in building U-shaped concrete canals in areas with freezing-thawing cycles in Ningxia and beyond.
Simulating Temperature Distribution in Soil around the U-shaped Channels in the Yellow River Irrigation Areas in Ningxia of China
WANG Fei (author) / TANG Shaorong (author) / WANG Hongyu (author)
2021
Article (Journal)
Electronic Resource
Unknown
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Ice regime characteristics in the Ningxia-Inner Mongolia reach of Yellow River
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