文章摘要
考虑太阳辐射的寒区衬砌渠道水-热-力耦合冻胀模型与应用
Frost heave modeling with thermos-hydro-mechanical coupling and application of a cold-region canal considering solar radiation
投稿时间:2020-08-08  修订日期:2020-09-21
DOI:
中文关键词: 寒区渠道  太阳辐射  冻土水-热-力耦合  不对称发展  热边界  冻结速率
英文关键词: cold-region canal  solar radiation  thermo-hydro-mechanics coupling of frozen soil  asymmetry development  thermal boundary  freezing rate
基金项目:国家重点研发计划“水资源高效开发利用”重点专项(2017YFC0405102);国家自然科学基金项目(51279168);冻土工程国家重点实验室开放基金资助项目(SKLFSE201801)
作者单位E-mail
江浩源 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室 724263751@qq.com 
王正中 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室 wangzz0910@163.com 
刘铨鸿 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室  
王羿 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室  
谭志翔 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室  
孟晓栋 西北农林科技大学 a旱区寒区水工程安全研究中心 b旱区农业水土工程教育部重点实验室  
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中文摘要:
      寒区渠道走向导致的太阳光遮蔽产生了阴阳坡效应,引起了渠道水、热、变形的非对称分布。为探明其对渠道冻胀破坏的影响规律,本文提出了渠道阴影计算方法,采用HOTTEL晴空辐射模型,基于辐射度算法建立了考虑太阳辐射时空变化的渠道热边界方程,并结合冻土水-热-力耦合理论构建了“环境-冻土-工程”相互作用的耦合冻胀模型。基于寒区“E-W”走向大型输水渠道现场监测数据验证了该模型的准确性,并系统分析了渠道温度场、水分场及变形场的耦合作用及发展变化的不对称、不同步规律。仿真结果表明:太阳辐射和阴坡遮蔽导致阴、阳坡热边界差异显著,日均温度差值可达3.5℃,使阴坡早于阳坡冻结15d,晚于阳坡融化1d,冻深最大差值达31cm;冻结期内阴坡冰含量明显高于阳坡,而融化期阳坡冰融化较快,水分场呈条带状分布;坡板和底板最大冻胀变形分别发生在1/3坡长处和偏阳坡处,阴、阳坡冻胀变形差值可达4.3cm;上述不对称、不同步冻结特征的宏观表现均是由阴阳坡太阳辐射的空间效应和昼夜温差的时间效应引起的温度梯度和冻结速率差异所致,并给出了冻胀数值模拟热边界选取的合理性建议,为旱寒区大型渠道防冻胀设计、复核及修复提供理论依据。
英文摘要:
      The sun shading caused by the canal orientation leads to the sunny-shady slope effect, which brings about the asymmetrical distribution of moisture, heat and deformation of the canal in cold regions. In order to explore the influence of solar radiation on canal frost heave damage, a shadow calculation method of canal was proposed and thermal boundary balance equation of canal was established based on radiation algorithm, using HOTTEL clear sky model. Next, a coupled thermo-hydro-mechanical model was proposed based on the frost heave theory and the transversely isotropic frost heave characteristics of frozen soil, considering the interaction of “environment-frozen soil-engineering”. Based on the on-site monitoring data of large-scale canal going from "E-W" in cold regions, the simulation method is verified and the coupled effect of temperature field, moisture field and deformation field and the asymmetry & asynchrony development are systematically analyzed. The results show that solar radiation and shady slope shading cause obvious differences in the thermal boundary between the shady and sunny slopes. The difference in daily average temperature can reach 3.5℃, causing the shady slope to freeze 15 days earlier than the sunny slope and 1 day later to melt. And also development difference of freezing depth is obvious with the maximum difference 31 cm. The ice content of the shady slope during the freezing period is significantly higher than that of the sunny slope, while the ice melting on the sunny slope during the melting period is faster, and the moisture field is distributed in strips. The maximum frost heave deformation of the slope slab and bottom slab occurs at 1/3 slope and near the sunny slope respectively, and also the development of frost heave deformation between the shady and sunny slopes is obvious with the maximum difference 4.3cm. The above asymmetric and asynchrony freezing characteristics all arise from the difference of temperature gradient and freezing rate caused by space effect of solar radiation and time effect of diurnal temperature difference. And also reasonable suggestions for the selection of the thermal boundary of the frost heave numerical simulation are given. The results can provide a theoretical basis for the design of anti-frost heave, review and repair of the large-scale canal in arid-cold regions.
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