| 引用本文: | 汪菲,唐少容,王红雨.基于AKIMA插值法的整体式U形渠道温度场数值模拟[J].灌溉排水学报,2021,(8):81-87. |
| WANG Fei,TANG Shaorong,WANG Hongyu.基于AKIMA插值法的整体式U形渠道温度场数值模拟[J].灌溉排水学报,2021,(8):81-87. |
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| 摘要: |
| 【目的】揭示整体式U形混凝土渠道渠基土温度场的分布和变化特征，为整体式U形混凝土渠道的抗冻胀工程提供理论依据。【方法】依据宁夏青铜峡市邵岗镇沙湖村进行的整体式U形混凝土衬砌渠道的原型观测试验结果，采用AKIMA插值法对各部位渠基土的温度梯度进行了计算，再利用有限元软件ANSYS对渠基土的温度场及温度梯度进行了数值模拟。【结果】渠道阴坡温度低于阳坡温度，其产生冻胀时间更早、冻结深度更大。在2月初气温回暖时，地温开始逐步升高。不同位置衬砌板下土体的温度梯度变化规律基本相同，均随土体深度的增加而减小。阴坡的平均温度梯度高于阳坡，距离土表越远温度梯度越小。衬砌板以下20 cm范围内的温度梯度波动较大，50～100 cm范围内的温度梯度相对来说较为平缓。采用AKIMA插值法计算出的渠基土温度梯度与通过有限元软件ANSYS进行的温度梯度模拟结果基本一致，ANSYS对温度场的模拟所得结果与实测渠基土地温结果一致。【结论】整体式U形混凝土渠道在不同位置衬砌板下的渠基土温度变化趋势一致，均随深度的增加而升高；不同深度土体温度梯度变化规律基本相同，均随深度增大而减小。 |
| 关键词: U形渠道；温度梯度；AKIMA插值法；数值模拟 |
| DOI：10.13522/j.cnki.ggps.2020675 |
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| Simulating Temperature Distribution in Soil Around the U-shaped Channels in the Yellow River Irrigation Areas in Ningxia of China |
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WANG Fei, TANG Shaorong, WANG Hongyu
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1. College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China;
2. Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation,
Yinchuan 750021, China; 3. Engineering Research Center for Efficient Utilization of
Water Resources in Modern Agriculture on Arid Regions, Yinchuan 750021, China
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| Abstract: |
| 【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. |
| Key words: U-shaped canal; temperature gradient; AKIMA interpolation; numerical simulation |
