南水北调肖河东沟倒虹吸三维有限元分析

发布时间：2018-07-09 15:09

本文选题：倒虹吸 + 有限元　；参考：《河北工程大学》2014年硕士论文

【摘要】：南水北调中线工程是世界水利项目中最伟大的工程之一，把水资源从相对比较丰富的长江流域通过输水明渠调集到水资源日趋贫瘠的京、津、冀地区，可以有效改善北方地区的水资源配置和生态环境。总干渠与河道相交时往往采用修建倒虹吸工程进行处理，而河道排水倒虹吸又是倒虹吸工程中数量最多、分布最广的一种结构。现在对这种建筑物的研究主要还停留在管身断面的优化设计和进出口的优化布置阶段，对于管身结构在不同工况下的应力状态以及管身四周回填土的应力、应变及沉降量的研究还很少，本人为了更好的了解和研究河道倒虹吸这种南水北调工程中特有的建筑物，故提出了河道倒虹吸管身及其周围回填土三维有限元分析的课题。国内外研究学者对倒虹吸这种地下建筑物进行分析研究，大多采用数值模拟方法进行模拟，同时证明了数值模拟研究的准确性和合理性。本文以南水北调中线工程宝丰至郏县段肖河东沟河道倒虹吸工程为背景，分别选取了水平管身段和最大埋深管身段两个最不利部位，运用大型通用型软件ANSYS，建立了管身与周围回填土的三维模型，进行了非线性有限元数值模拟研究，并获得了较为合理的成果。首先系统、详细的阐述了非线性弹塑性的基本理论和混凝土、钢筋、土体三种材料的主要本构模型和屈服准则，以及钢筋混凝土材料进行有限元分析时钢筋的处理方式。然后分别计算了水平管身段在六种工况下和最大埋深管身段在三种工况下，管身结构的应力状态和管身周围土体的位移和应力状态。最后，分析了管身在最不利工况下容易出现裂缝的位置，以及管身基底换填的15%水泥土和底层泥质砂岩的承载力都能否要求相关的设计要求，，为以后相关工程设计工作提供了一定的参考价值。
[Abstract]:The South-to-North Water diversion Project is one of the greatest water conservancy projects in the world. It has mobilized water resources from the relatively abundant Yangtze River basin through open channels to the increasingly barren Beijing, Tianjin, and Hebei regions. It can effectively improve the allocation of water resources and ecological environment in the northern region. When the total trunk canal intersects with the river channel, the inverted siphon project is often used to deal with it, and the drainage inverted siphon is the most widely distributed structure in the inverted siphon project. At present, the research on this kind of building is still mainly at the stage of optimum design of pipe section and optimal layout of inlet and outlet. For the stress state of pipe structure under different working conditions and the stress of backfill around pipe body, The research on strain and settlement is still few. In order to better understand and study the special building of river channel inverted siphon, this paper puts forward the subject of three-dimensional finite element analysis of river channel inverted siphon and its surrounding backfill soil. Most of the researches on inverted siphon are carried out by numerical simulation, and the accuracy and rationality of the numerical simulation are proved. Based on the inverted siphon project of Xiaohedong ditch in Baofeng to Jiaxian section of the middle route of South-to-North Water transfer Project, this paper selects the two most disadvantageous parts of the horizontal pipe section and the maximum buried depth section, respectively. The 3D model of pipe body and surrounding backfill is established by using the large-scale universal software ANSYS. the nonlinear finite element numerical simulation is carried out, and reasonable results are obtained. Firstly, the basic theory of nonlinear elastoplasticity and the main constitutive model and yield criterion of concrete, steel bar and soil are expounded in detail, as well as the treatment method of steel bar in finite element analysis of reinforced concrete material. Then the stress state of the pipe structure and the displacement and stress state of the soil around the pipe body are calculated under six working conditions and three conditions respectively. Finally, this paper analyzes the position where the pipe body is prone to crack under the most unfavorable working conditions, and whether the bearing capacity of the 15% cement soil and the bottom muddy sandstone, which is replaced with the base of the pipe body, can require the relevant design requirements. It provides a certain reference value for the related engineering design work in the future.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV68;TV672.5

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