| 引用本文: | 安 鹏,邢义川,张爱军,等.弧底梯形渠道抗冻胀结构优化与数值模拟[J].灌溉排水学报,2017,36(11):56-62. |
| AN Peng,XING Yichuan,ZHANG Aijun,et al.弧底梯形渠道抗冻胀结构优化与数值模拟[J].灌溉排水学报,2017,36(11):56-62. |
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| 摘要: |
| 在季节性冻土地区，弧底梯形渠道属于抗冻胀结构之一，但其设计方法仍依靠经验和规范，设计结构易发生冻胀破坏，为此提出了结构优化的方法进行渠道设计。该方法包括构建结构优化数学模型和“冻土-衬砌结构”简化算法二方面内容。首先以渠道造价为目标函数，以实用经济断面、衬砌体拉应力和法向位移为约束，建立结构优化数学模型。其次采用“初始冻胀位移”模拟高度非线性的法向冻胀力，通过定义摩尔库仑摩擦单位模拟冻土与衬砌间的相互作用，最后基于ANSYS的APDL语言的二次开发建立参数化模型进行结构优化。通过实际工程的结构优化表明，在最不利气象和水文地质条件下，优化后的断面可保证渠道不产生裂缝；同时节约土地面积207 m2/km，衬砌厚度减小0.3 cm。提出的方法可用于弧底梯形渠道结构计算和优化设计，可以获得运行安全、造价合理的断面尺寸。 |
| 关键词: 渠道； 结构优化； 抗冻胀设计； 数值模拟 |
| DOI：10.13522/j.cnki.ggps.2017.11.011 |
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| Optimal Analysis of Anti-frost Heaping Canal with Cross Section of Trapezoidal Slopes and Curved Bed |
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AN Peng, XING Yichuan, ZHANG Aijun, ZHAO Lei, CHENG Dawei
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College of Geology Engineering & Geomatics, Chang’an University, Xi’an 710054, China; China Institute of Water Resources and Hydropower Research, Beijing 100048, China; Northwest A & F University, Yangling 712100, China; Hebei Provincial Second Investigation Design and Research Institute of Water Conservancy and Hydroelectric Power, Shijiazhuang 050021, China
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| Abstract: |
| Trapezoidal canals with curved-bedare is often used in seasonal freezing regions, but their design is based on experiences and standards whichis prone to frost heaping. In this paper, we proposed a new method to optimize the channel design. The method consists of an optimal structure model and a simplified “frozen soil- lining” model. The objective of the optimization is to minimize the costs of a unit length of canal with constraints on economic practical cross-section and the largest normal displacement and stress of the lining. We firstly simulated the highly nonlinear normal frost-heaving force using the initial displacement method in which the effective friction between the lining and the frozen soil was computed using the Mohr-Coulomb contact approach. The parametric model for canal under frost-heaving was then developed usingVersion. 2 ANSYS package written inAPDL programming language. Practical application of the model showed that the optimized cross section of the lining can resist cracking and, in the meantime, savedland by 207 m2/km and reduced the lining thickness of the canal to 0.3 cm. The proposed model has implication in structure design of channels. |
| Key words: canal; structure optimization; anti-frost design; numerical simulation |
