涌潮冲击排桩式丁坝的三维数值模拟研究

发布时间：2018-03-08 06:43

本文选题：模型试验　切入点：排桩式丁坝　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：排桩式丁坝以钢筋混凝土排桩为主体,用连系梁保证丁坝的整体性,提高丁坝受涌潮冲击的能力,保证丁坝的稳定性。排桩式丁坝应用于钱塘江北岸险段标准海塘工程海宁段,在河道整治、防洪护岸、促淤保滩等方面发挥着重要的作用。为了改善排桩式丁坝的设计方法,研究其在钱塘江涌潮作用下的压力分布规律就显得尤为重要。故早期研究以试验手段为主,随着计算机及数值模拟技术的迅速发展,数值模拟与试验相结合逐渐成为研究丁坝附近水力特性的一个重要方法。 1.水槽试验在浙江省水利河口研究院六堡试验基地进行。试验目的是弥补现场原位观测的不足,配合三维数学模型计算,系统地研究排桩式丁坝上涌潮压力的时空分布以及排桩式丁坝受力机理。模型相似是进行涌潮模型试验的前提条件,也是模型试验的基本出发点。为了获得原型和模型中的物理现象相似,要满足运动相似、几何相似、动力相似等条件。对于本试验,按弗劳德准则设计。 2.本文建立了涌潮冲击排桩式丁坝的三维数值模型,采用有限体积法对控制方程进行离散,利用压力隐式算子分割法(PISO)求解雷诺时均方程和RNG κ-ε紊流模型,应用体积函数法(VOF)追踪自由表面,计算结果与水槽试验吻合较好,得到了涌潮冲击丁坝过程中流场、自由液面及压力的变化规律。 3.研究大量的单丁坝和双丁坝算例,分别对透水率、初始水位、涌潮高度三个重要的影响因素进行了探讨,提出了具有一定规律性的结论：在单丁坝情况下,研究了透水率、初始水位、涌潮高度三个因素对丁坝空间受力的影响；在双丁坝情况下,系统性地研究透水率、初始水位、涌潮高度、间距等因素对丁坝时空受力的影响,旨在得出丁坝在不同工况条件下受涌潮冲击压力的分布规律,为实际工程设计提供技术支持。
[Abstract]:With reinforced concrete piles as the main body, tie beams are used to ensure the integrity of the spur dikes, to improve the ability of the spur dikes to be affected by the surge tide, and to ensure the stability of the spur dikes. The pile-type spur dikes are used in the Haining section of the standard seawall project on the north bank of the Qiantang River. It plays an important role in river regulation, flood control and bank protection, and in order to improve the design method of pile-type spur dike. It is particularly important to study the pressure distribution of Qiantang River under the action of tidal bore. Therefore, the early research is mainly by means of experiments, and with the rapid development of computer and numerical simulation technology, The combination of numerical simulation and test has gradually become an important method to study hydraulic characteristics near spur dikes. 1. The flume test was carried out at Liubao Experimental Base of Zhejiang Water Conservancy Estuary Research Institute. The purpose of the experiment was to make up for the deficiency of in-situ observation and to combine with the calculation of three-dimensional mathematical model. The spatial and temporal distribution of upwelling pressure and the stress mechanism of pile-type spur dike are studied systematically. The similarity of model is the precondition of model test of surge. It is also the basic starting point of the model test. In order to obtain the similarity of the physical phenomena between the prototype and the model, the conditions of motion similarity, geometric similarity and dynamic similarity must be satisfied. For this experiment, the Froude criterion is used to design the model. 2. In this paper, a three-dimensional numerical model of surge impingement pile-type spur dike is established. The control equation is discretized by the finite volume method, and the Reynolds time-averaged equation and the RNG 魏-蔚 turbulence model are solved by the pressure implicit operator partitioning method (PISOO). The volume function method is used to track the free surface. The calculated results are in good agreement with the flume test, and the variation of the flow field, free liquid surface and pressure during the tidal surge impingement on the spur dike is obtained. 3. A large number of examples of single and double spur dams are studied, and three important influencing factors such as permeability, initial water level and surge height are discussed respectively. The conclusion with certain regularity is put forward: in the case of single spur dam, the permeability rate is studied. In the case of double spur dams, the effects of water permeability, initial water level, surge height and spacing on the spatial and temporal forces of spur dikes are systematically studied. The purpose of this paper is to find out the distribution law of the pressure under the impact of surge tide under different working conditions, and to provide technical support for the actual engineering design.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV863;TV135

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