本文選題：倒虹吸 + 有限元��； 參考：《河北工程大學(xué)》2014年碩士論文

【摘要】：南水北調(diào)中線工程是世界水利項(xiàng)目中最偉大的工程之一，把水資源從相對比較豐富的長江流域通過輸水明渠調(diào)集到水資源日趨貧瘠的京、津、冀地區(qū)，可以有效改善北方地區(qū)的水資源配置和生態(tài)環(huán)境�？偢汕c河道相交時(shí)往往采用修建倒虹吸工程進(jìn)行處理，而河道排水倒虹吸又是倒虹吸工程中數(shù)量最多、分布最廣的一種結(jié)構(gòu)�，F(xiàn)在對這種建筑物的研究主要還停留在管身斷面的優(yōu)化設(shè)計(jì)和進(jìn)出口的優(yōu)化布置階段，對于管身結(jié)構(gòu)在不同工況下的應(yīng)力狀態(tài)以及管身四周回填土的應(yīng)力、應(yīng)變及沉降量的研究還很少，本人為了更好的了解和研究河道倒虹吸這種南水北調(diào)工程中特有的建筑物，故提出了河道倒虹吸管身及其周圍回填土三維有限元分析的課題。 國內(nèi)外研究學(xué)者對倒虹吸這種地下建筑物進(jìn)行分析研究，大多采用數(shù)值模擬方法進(jìn)行模擬，同時(shí)證明了數(shù)值模擬研究的準(zhǔn)確性和合理性。本文以南水北調(diào)中線工程寶豐至郟縣段肖河?xùn)|溝河道倒虹吸工程為背景，分別選取了水平管身段和最大埋深管身段兩個(gè)最不利部位，運(yùn)用大型通用型軟件ANSYS，建立了管身與周圍回填土的三維模型，進(jìn)行了非線性有限元數(shù)值模擬研究，并獲得了較為合理的成果。 首先系統(tǒng)、詳細(xì)的闡述了非線性彈塑性的基本理論和混凝土、鋼筋、土體三種材料的主要本構(gòu)模型和屈服準(zhǔn)則，以及鋼筋混凝土材料進(jìn)行有限元分析時(shí)鋼筋的處理方式。然后分別計(jì)算了水平管身段在六種工況下和最大埋深管身段在三種工況下，管身結(jié)構(gòu)的應(yīng)力狀態(tài)和管身周圍土體的位移和應(yīng)力狀態(tài)。最后，分析了管身在最不利工況下容易出現(xiàn)裂縫的位置，以及管身基底換填的15%水泥土和底層泥質(zhì)砂巖的承載力都能否要求相關(guān)的設(shè)計(jì)要求，，為以后相關(guān)工程設(shè)計(jì)工作提供了一定的參考價(jià)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.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV68;TV672.5

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