| Cite this article: | 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,0,():-. |
| Wang Fei,tangshaorong,wanghongyu.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,0,():-. |
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| DOI： |
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| Numerical simulation of temperature field in U-shaped canal based on AKIMA interpolation method |
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Wang Fei, tangshaorong, wanghongyu
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College of Civil and Hydraulic Engineering, Ningxia University
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| Abstract: |
| 【Background】With the development of society and economy, the contradiction between water supply and demand caused by water shortage and low efficiency of agricultural irrigation water has become increasingly acute, which has seriously restricted the sustainable development of economy and society in Ningxia. As one of the large irrigation areas in China, Ningxia Yellow River Irrigation Area has built a large number of canal irrigation projects.However, severe frost heave damage will occur to the canal under negative temperature in winter, which has a serious impact on the stability of the canal slope and the anti-seepage effect, shortening the service life of the lining plate, causing serious leakage and affecting the function of the canal.Therefore, the research on anti-frost heave damage of canal lining has important theoretical significance and application prospect.Ningxia is located in seasonal permafrost region, and the canal foundation soil will freeze and thaw cycle with the alternation of the four seasons, which will cause serious frost heave damage and leakage of the canal lining and affect the function of the canal.The freezing of canal foundation soil is a hydrothermal transfer process with phase change . In addition to topographic, geological, hydrological and other factors, heat flow and temperature gradient in soil are also important factors affecting the hydrothermal transfer process of canal foundation soil.Therefore, it is of great significance to study the temperature field distribution and temperature gradient variation characteristics of channel foundation soil for the anti-frost heave damage of canal.【Objective】The objective is to reveal the integral u-shaped concrete canal base soil temperature field distribution and change characteristics and provide a theoretical basis for the anti-frost heave engineering of the integral U-shaped concrete canal.【Method】The prototype observation and test data of the integral U-shaped concrete canal in Shahu Village, Shaogang Town, Qingtongxia City, Ningxia Were processed. Firstly, AKIMA interpolation method was used to calculate the temperature gradient of canal subsoil at various positions. Then, ANSYS was used to simulate the temperature field and temperature gradient of canal subsoil numerically.【Result】The temperature of the shady slope is lower than that of the sunny slope, and the frost heaving time is earlier and the freezing depth is larger.The soil temperature gradient of different depths is basically the same. The temperature gradient of soil decreases and changes gently with the increase of soil depth, and the temperature gradient decreases with the distance from the soil surface. The average temperature gradient of shady slope is higher than that of sunny slope, and the soil temperature of canal base tends to zero with the increase of depth.The interior temperature changes greatly in the range of 20cm below the lining plate, and the ground temperature changes relatively gently in the range of 50cm-100cm. There is a positive correlation between air temperature and ground temperature, which is basically consistent with the measured law.【Conclusion】It was found that the conclusions obtained by the two methods are consistent with the trend of the measured results and can be used to obtain the temperature law of subsoil of u-shaped concrete lining canal.which is basically consistent with the measured law. |
| Key words: U-shaped canal;Temperature gradient;AKIMA interpolation;Numerical simulation; |
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