| 联合Winkler-Pasternak模型的冬季输水梯形渠道冻胀力学分析 |
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| 引用本文： | 肖旻, 祝婉玲, 王正中, 吴浪, 杨晓松, 崔浩, 葛建锐. 联合Winkler-Pasternak模型的冬季输水梯形渠道冻胀力学分析[J]. 农业工程学报, 2023, 39(10): 88-95. DOI: 10.11975/j.issn.1002-6819.202212075 |
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| 作者姓名： | 肖旻 祝婉玲 王正中 吴浪 杨晓松 崔浩 葛建锐 |
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| 作者单位： | 1.江西科技师范大学建筑工程学院, 江西省科协智库防灾减灾工程技术研究基地, 南昌 330013;2.西北农林科技大学旱区寒区水工程安全研究中心, 旱区农业水土工程教育部重点实验室, 杨凌 712100;3.中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 兰州 730000;4.塔里木大学水利与建筑工程学院, 阿拉尔 843300;5.兰州理工大学能源与动力工程学院, 兰州 730050 |
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| 基金项目： | 国家重点研发计划重点专项（2017YFC0405100）；新疆生产建设兵团一师横向项目（SWJ2022KT23）；国家自然科学基金项目（U2003108，51641 903，51869 029）；江西省教育厅科技项目（GJJ190621）；冻土工程国家重点实验室开放基金项目（SKLFSE201801）；江西科技师范大学博士科研启动基金项目（2019BSQD11） |
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| 摘 要： | 为克服现有冬季输水梯形渠道冻胀力学模型未充分考虑冻结区与水下非冻结区差异，以及未考虑土体连续性的不足，该研究根据冻土与非冻土剪切刚度的不同，冻结区采用Pasternak双参数弹性地基梁模型，而非冻结区采用Winkler模型，综合Pasternak模型考虑土体连续性及Winkler模型易于求解、所需参数少的优点，提出联合Winkler-Pasternak模型的冬季输水梯形渠道冻胀力学分析方法。以新疆玛纳斯河流域某冬季输水梯形渠道为例，计算渠坡衬砌板法向变形，并将本文模型、Winkler模型、Pasternak模型计算结果与观测值进行了对比分析，最后计算了衬砌板截面弯矩及上表面应力分布。结果表明：衬砌板法向变形可分为冻胀段、沉降段及冻胀-沉降过渡段三个部分，三种模型计算结果均能较好地反映衬砌板法向位移基本变化趋势，且本文模型计算结果与实测值更加接近，表明了模型合理性。衬砌板易开裂位置位于冻土区距离水位线10.0%～23.3%坡板长处，与工程实际相符。本研究可为寒区冬季输水梯形渠道抗冻胀设计提供科学参考与理论依据。
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| 关 键 词： | 冻土工程 渠道 冻胀 冬季输水 力学模型 Winkler-Pasternak模型 |
| 收稿时间： | 2022-12-11 |
| 修稿时间： | 2023-04-08 |
Frost-heaving mechanical analysis of the trapezoidal canal with water delivery in winter using both Winkler-Pasternak model |
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| XIAO Min, ZHU Wanling, WANG Zhengzhong, WU Lang, YANG Xiaosong, CUI Hao, GE Jianrui. Frost-heaving mechanical analysis of the trapezoidal canal with water delivery in winter using both Winkler-Pasternak model[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2023, 39(10): 88-95. DOI: 10.11975/j.issn.1002-6819.202212075 |
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| Authors: | XIAO Min ZHU Wanling WANG Zhengzhong WU Lang YANG Xiaosong CUI Hao GE Jianrui |
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| Affiliation: | 1.School of Civil Engineering, Disaster Prevention and Mitigation Engineering Technology Research Base of Think Tank of Jiangxi Association for Science and Technology, Jiangxi Science&Technology Normal University, Nanchang 330013, China;2.Research Center of Arid and Cold Regions Water Engineering Safety, Key Laboratory of Agricultural Soil and Water Engineering in Arid and semiarid Areas of Ministry of Education, Northwest A&F University, Yangling 712100, China;3.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;4.College of Water onservancy and Construction Engineering, Tarim University, Alaer 843300, China;5.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | A water delivery system can be gradually away from the normal state of the canal operation in northern China in winter. Water diversion projects can be launched to meet the harsh requirement on the large and medium-sized city''s residents living water and industrial water consumption, as the guaranteed rates increased. However, the existing mechanical model of the canal with the water delivery cannot fully consider the difference between the freezing and underwater non-freezing areas in winter, particularly for the continuity of soil. It is a high demand to combine the difference in shear stiffness between frozen soil and non-frozen soil. Pasternak model with two parameters can be expected to consider the soil continuity in the freezing area, whereas, the traditional Winkler model can be adopted in the non-freezing area. By contrast, the Winkler model with only a few parameters can be easily calculated for definite physical significance. In this study, the combined Winkler-Pasternak model was proposed for the frost-heaving mechanical analysis of the trapezoidal canal with water delivery in winter. Taking a trapezoidal canal with water delivery in winter in the Manas River basin in Xinjiang of western China as a prototype, the real normal frost-heaving amount, and subsidence deformation of the canal lining plate were also calculated using the improved model, Winkler and Pasternak model. Then, the bending moment was calculated with the upper surface stress of each section of the lining plate. The results indicate that the lining plate was divided into three parts of frost heave, subsidence and frost heave-subsidence transition section. Three models better represented the basic change trend of normal displacement of the lining plate. Meanwhile, the improved model was in better agreement with the measurement. A comparative analysis showed that the improved model was much more accurate than the traditional Winkler model in the freezing area, whereas, some errors but trivial differences were compared with the Pasternak model in the non-freezing area. Furthermore, the improved model shared the excellent performance of the Winkler model, such as simple calculation, clear physical meaning, and few required parameters. The bending moment of sections decreased rapidly in the freezing area with the increase of groundwater depth. The risk of frost-heaving damage to the canal lining plate was dramatically reduced at the groundwater level by appropriate drainage measures. The position in the frozen soil area of the lining plate easy to crack was located at 10.0%~23.3% of the lining plate length away from the waterline. The optimal operation conditions were adopted in the ice-free water delivery of the trapezoidal canal in winter. The improved model can be also applied to the ever-increasingly common situation of water delivery with the ice cover. The finding can provide a strong reference to design the frost heave resistance of the trapezoidal canal with water delivery in winter. |
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| Keywords: | frozen soil engineering cancal frost heave water deliver in winter mechanical model Winkler-Pasternak model |
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