本文選題：模型試驗　切入點：排樁式丁壩　出處：《浙江大學》2014年碩士論文　論文類型：學位論文

【摘要】：排樁式丁壩以鋼筋混凝土排樁為主體,用連系梁保證丁壩的整體性,提高丁壩受涌潮沖擊的能力,保證丁壩的穩(wěn)定性。排樁式丁壩應用于錢塘江北岸險段標準海塘工程海寧段,在河道整治、防洪護岸、促淤保灘等方面發(fā)揮著重要的作用。為了改善排樁式丁壩的設計方法,研究其在錢塘江涌潮作用下的壓力分布規(guī)律就顯得尤為重要。故早期研究以試驗手段為主,隨著計算機及數(shù)值模擬技術的迅速發(fā)展,數(shù)值模擬與試驗相結合逐漸成為研究丁壩附近水力特性的一個重要方法。 1.水槽試驗在浙江省水利河口研究院六堡試驗基地進行。試驗目的是彌補現(xiàn)場原位觀測的不足,配合三維數(shù)學模型計算,系統(tǒng)地研究排樁式丁壩上涌潮壓力的時空分布以及排樁式丁壩受力機理。模型相似是進行涌潮模型試驗的前提條件,也是模型試驗的基本出發(fā)點。為了獲得原型和模型中的物理現(xiàn)象相似,要滿足運動相似、幾何相似、動力相似等條件。對于本試驗,按弗勞德準則設計。 2.本文建立了涌潮沖擊排樁式丁壩的三維數(shù)值模型,采用有限體積法對控制方程進行離散,利用壓力隱式算子分割法(PISO)求解雷諾時均方程和RNG κ-ε紊流模型,應用體積函數(shù)法(VOF)追蹤自由表面,計算結果與水槽試驗吻合較好,得到了涌潮沖擊丁壩過程中流場、自由液面及壓力的變化規(guī)律。 3.研究大量的單丁壩和雙丁壩算例,分別對透水率、初始水位、涌潮高度三個重要的影響因素進行了探討,提出了具有一定規(guī)律性的結論：在單丁壩情況下,研究了透水率、初始水位、涌潮高度三個因素對丁壩空間受力的影響；在雙丁壩情況下,系統(tǒng)性地研究透水率、初始水位、涌潮高度、間距等因素對丁壩時空受力的影響,旨在得出丁壩在不同工況條件下受涌潮沖擊壓力的分布規(guī)律,為實際工程設計提供技術支持。
[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.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV863;TV135

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