| 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,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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| 摘要: |
| 【目的】为揭示整体式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型混凝土渠道的抗冻胀工程提供理论依据。【方法】对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进行了分析处理，先采用AKIMA插值法对各部位渠基土的温度梯度进行计算，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；不同深度土体温度梯度变化规律基本相同，温度梯度均随土体深度增加而减小且变化平缓，距离土表越远温度梯度越小，阴坡的平均温度梯度高于阳坡，且渠基土温度随深度的增加趋近于0℃。衬砌板以下20cm的范围内地温变化幅度大，50cm-100cm 范围内的地温变化相对来说较为平缓，气温与地温呈正相关趋势，与实测规律基本一致。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论与实测渠基土地温结果保持一致。【结论】两种方法均可用来求得U形混凝土衬砌渠道渠基土温度规律。 |
| 关键词: U形渠道；温度梯度；AKIMA插值法；数值模拟； |
| DOI： |
| 分类号:TV16 |
| 基金项目:宁夏重点研发项目（引才专项）资助项目（2018BEB04035） |
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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; |
